IRIS MUSTANG Metrics


Amplifier Saturation Metric


Description

The number of times that the 'Amplifier saturation detected' bit in the 'dq_flags' byte is set within a miniSEED file. This data quality flag is set by some dataloggers in the fixed section of the miniSEED header. The flag was intended to indicate that the preamp is being overdriven, but the exact meaning is datalogger-specific.
Please consult the Detailed Documentation

metric=amplifier_saturation


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Amplifier saturation detected (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Asl Coherence Metric


Description

This metric computes the coherence between two co-located broadband sensors using a gamma-squared coherence. Data windows for comparison are one-day and only like components are compared (e.g. vertical to vertical). The coherence values are averaged into different frequency bands. (contributed by Albuquerque Seismic Laboratory)
Please consult the Detailed Documentation

metric=asl_coherence


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain PB4to8sec=X to retrieve only measurements with that value, or PB4to8sec_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
PB4to8sec DOUBLE PRECISION

The average coherence in the 4 to 8 second period range.

PB18to22sec DOUBLE PRECISION

The average coherence in the 18 to 22 second period range.

PB90to110sec DOUBLE PRECISION

The average coherence in the 90 to 110 second period range.

PB200to500sec DOUBLE PRECISION

The average coherence in the 200 to 500 second period range.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Calibration Signal Metric


Description

The number of times that the 'Calibration signals present' bit in the 'act_flags' byte is set within a miniSEED file. A value of 1 indicates that a calibration signal was being sent to that channel.
Please consult the Detailed Documentation

metric=calibration_signal


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Calibration signals present (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Channel Continuity Metric


Description

This metric reports time durations of continuous data for the specified channel.It represents a combination of continuous days from the channel_up_time metric, so a large value suggests good data continuity.The start and end time will reflect the time extent for this continuous measurement.

metric=channel_continuity


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

The number of seconds of the continuous duration.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Channel Up Time Metric


Description

This metric reports time durations of continuous data for the specified channel. The maximum time extent for this metric is a 24 hour period from midnight to midnight.Days that have contiguous data with no time breaks will have separate entries for each day here, but will bejoined into a single record in the channel_continuity metric, which can span multiple days.
Please consult the Detailed Documentation

metric=channel_up_time


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

The number of seconds of the continuous duration.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Clock Locked Metric


Description

The number of times that the 'Clock locked' bit in the 'io_flags' byte is set within a miniSEED file. This clock flag is set to 1 by some dataloggers in the fixed section of the miniSEED header to indicate that its GPS has locked with enough satellites to obtain a time/position fix.
Please consult the Detailed Documentation

metric=clock_locked


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Clock locked (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Cross Talk Metric


Description

The correlation coefficient of channel pairs from the same sensor. Data windows are defined by seismic events. Correlation coefficients near 1 may indicate cross-talk between those channels.
Please consult the Detailed Documentation

metric=cross_talk


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

A correlation coefficient.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Data Latency Metric


Description

Data latency is the time in seconds between the acquisition of a sample in the field and the time that it was written to disk or memory at the IRIS DMC.
Please consult the Detailed Documentation

metric=data_latency


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Latency (s).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Dc Offset Metric


Description

Metric to process a series of daily means and return a vector of likelihood that a DC shift has occurred.
Please consult the Detailed Documentation

metric=dc_offset


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

A unitless value indicating the degree of localized change in signal mean.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Dead Channel Exp Metric


Description

Dead channel metric - exponential fit. This metric is calculated from the mean of all the PSDs generated (typically 47 for a 24 hour period). Values of the PSD mean curve over the band expLoPeriod:expHiPeriod are fit to an exponential curve by a least squares linear regression of log(PSD mean) ~ log(period). The dead_channel_exp metric is the standard deviation of the fit residuals of this regression. Lower numbers indicate a better fit and a higher likelihood that the mean PSD is exponential - an indication of a dead channel.
Please consult the Detailed Documentation

metric=dead_channel_exp


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Standard Deviation of residuals.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Dead Channel Gsn Metric


Description

A boolean measurement providing a TRUE or FALSE indication that the channel exhibits a 5dB deviation below the NLNM in the 4 to 8s period band as measured using a McNamara PDF noise matrix. The TRUE condition is indicated with a numeric representation of '1' and the FALSE condition represented as a '0'.
Please consult the Detailed Documentation

metric=dead_channel_gsn


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value TEXT

Set to 1 if TRUE that it meets the GSN dead channel criteria, set to 0 if FALSE.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Dead Channel Lin Metric


Description

Dead channel metric - linear fit. This metric is calculated from the mean of all the PSDs generated (typically 47 for a 24 hour period). Values of the PSD mean curve over the band linLoPeriod:linHiPeriod are fit to a linear curve by a least squares linear regression of PSD mean ~ log(period). The dead_channel_lin metric is the standard deviation of the fit residuals of this regression. Lower numbers indicate a better fit and a higher likelihood that the mean PSD is linear - an indication that the sensor is not returning expected seismic energy.
Please consult the Detailed Documentation

metric=dead_channel_lin


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Standard Deviation of residuals.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Digital Filter Charging Metric


Description

The number of times that the 'A digital filter may be charging' bit in the 'dq_flags' byte is set within a miniSEED file. Data samples acquired while a datalogger is loading filter parameters - such as after a reboot - may contain a transient.
Please consult the Detailed Documentation

metric=digital_filter_charging


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

A digital filter may be charging (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Digitizer Clipping Metric


Description

The number of times that the 'Digitizer clipping detected' bit in the 'dq_flags' byte is set within a miniSEED file. This flag indicates that the input voltage has exceeded the maximum range of the ADC.
Please consult the Detailed Documentation

metric=digitizer_clipping


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Digitizer clipping detected (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Event Begin Metric


Description

The number of times that the 'Beginning of an event, station trigger' bit in the 'act_flags' byte is set within a miniSEED file. This metric can be used to quickly identify data days that may have events. It may also indicate when trigger parameters need adjusting at a station.
Please consult the Detailed Documentation

metric=event_begin


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Beginning of an event, station trigger (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Event End Metric


Description

The number of times that the 'End of an event, station detrigger' bit in the 'act_flags' byte is set within a miniSEED file. This metric can be used to quickly identify data days that may have events. It may also indicate when trigger parameters need adjusting at a station.
Please consult the Detailed Documentation

metric=event_end


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

End of an event, station detrigger (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Event In Progress Metric


Description

The number of times that the 'Event in progress' bit in the 'act_flags' byte is set within a miniSEED file. This metric can be used to quickly identify data days that may have events. It may also indicate when trigger parameters need adjusting at a station.
Please consult the Detailed Documentation

metric=event_in_progress


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Event in progress (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Feed Latency Metric


Description

Feed latency is the time in seconds since new data from a channel was last written to disk or memory at the IRIS DMC.
Please consult the Detailed Documentation

metric=feed_latency


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Latency (s).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Glitches Metric


Description

The number of times that the 'Glitches detected' bit in the 'dq_flags' byte is set within a miniSEED file. This metric can be used to identify data with large filled values that data users may need to handle in a way that they don't affect their research outcomes.
Please consult the Detailed Documentation

metric=glitches


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Glitches detected (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


M2 Tides Metric


Description

Perform comparison of sensor signal to tidal motion using least squares fit to tidal motion synthetics. Results will be best fit to the M2 tide.

metric=m2_tides


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain gain_ratio=X to retrieve only measurements with that value, or gain_ratio_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
gain_ratio DOUBLE PRECISION

The ratio of the M2 amplitude observed to the synthetic amplitude.

phase_diff DOUBLE PRECISION

The difference of the M2 phase observed to the synthetic phase.

rms_residual_obs DOUBLE PRECISION

The mean of the sum of the squares of the residuals for least squares fit to observed.

rms_residual_syn DOUBLE PRECISION

The mean of the sum of the squares of the residuals for least squares fit to synthetic.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Max Gap Metric


Description

Indicates the size of the largest gap encountered within a 24-hour window.
Please consult the Detailed Documentation

metric=max_gap


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Maximum gap length (s) in a day.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Max Overlap Metric


Description

Indicates the size of the largest overlap in seconds encountered within a 24-hour window.
Please consult the Detailed Documentation

metric=max_overlap


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Maximum overlap (s) in a day.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Max STA/LTA Metric


Description

The STALTAMetric function calculates the maximum of STA/LTA of the incoming seismic signal over a 24 hour period. In order to reduce computation time of the rolling averages, the averaging window is advanced in 1/2 second increments.
Please consult the Detailed Documentation

metric=max_stalta


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Maximum of short to long-term average and the approximate time where the average occurred.

time TIMESTAMPTZ

The time index that applies to the value.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Metric Error Metric


Description

A place for storing an error message reported while processing a given target. Can point to metric and time for later forensics. No guarantees that the entry will be eliminated once the issue is resolved, so it is best to check the lddate (entry time).

metric=metric_error


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

An error code, if applicable

message TEXT

The error message

metric TEXT

The metric or metric family being processed when the error occurred

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Missing Padded Data Metric


Description

The number of times that the 'Missing/padded data present' bit in the 'dq_flags' byte is set within a miniSEED file. This metric can be used to identify data with padded values that data users may need to handle in a way that they don't affect their research outcomes.
Please consult the Detailed Documentation

metric=missing_padded_data


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Missing/padded data present (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Num Gaps Metric


Description

This metric reports the number of gaps encountered within a 24-hour window.
Please consult the Detailed Documentation

metric=num_gaps


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Number of Gaps Per Day.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Num Overlaps Metric


Description

This metric reports the number of overlaps encountered in a 24-hour window.
Please consult the Detailed Documentation

metric=num_overlaps


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Number of overlaps in a day.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Num Spikes Metric


Description

This metric uses a rolling Hampel filter, a median absolute deviation (MAD) test, to find outliers in a timeseries. The number of discrete spikes is determined after adjacent outliers have been combined into individual spikes.
NOTE: not to be confused with the spikes metric, which is an SOH flag only.
Please consult the Detailed Documentation

metric=num_spikes


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Number of spikes detected in a day.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Orientation Check Metric


Description

Determine channel orientations by rotating horizontal channels until the resulting radial component maximizes cross-correlation with the Hilbert transform of the vertical component. This metric uses Rayleigh waves from large, shallow events.
Please consult the Detailed Documentation

metric=orientation_check


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain azimuth_R=X to retrieve only measurements with that value, or azimuth_R_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
azimuth_R DOUBLE PRECISION

The azimuth of the radial component demonstrating maximum coherence.

backAzimuth DOUBLE PRECISION

Back azimuth from the this station to the source event, in degrees from north.

azimuth_Y_obs DOUBLE PRECISION

The observed Y horizontal component direction based on maximum coherence.

azimuth_X_obs DOUBLE PRECISION

The X horizontal component direction set to 90 degrees clockwise from observed Y.

azimuth_Y_meta DOUBLE PRECISION

The Y orthogonal sensor direction recorded in the metadata.

azimuth_X_meta DOUBLE PRECISION

The X orthogonal sensor direction recorded in the metadata.

max_Czr DOUBLE PRECISION

Normalized correlation coefficient #1 (see full documentation for details).

max_C_zr DOUBLE PRECISION

Normalized correlation coefficient #2 (see full documentation for details).

magnitude DOUBLE PRECISION

The magnitude of the source event.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Pct Above Nhnm Metric


Description

Percent above New High Noise Model. Percentage of Probability Density Function values that are above the New High Noise Model. This value is calculated over the entire time period.
Please consult the Detailed Documentation

metric=pct_above_nhnm


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Percent value 0-100.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Pct Below Nlnm Metric


Description

Percent below New Low Noise Model. Percentage of Probability Density Function values that are below the New Low Noise Model. This value is calculated over the entire time period.
Please consult the Detailed Documentation

metric=pct_below_nlnm


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Percent value 0-100.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Percent Availability Metric


Description

The portion of data available for each day is represented as a percentage. 100% data available means full coverage of data for the reported start and end time.
Please consult the Detailed Documentation

metric=percent_availability


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Availability in Percent.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Polarity Check Metric


Description

The signed cross-correlation peak value based on the cross-correlation of two neighboring station channels in proximity to a large earthquake signal. A negative peak close to 1.0 can indicate reversed polarity.


Please consult the Detailed Documentation

metric=polarity_check


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

The signed cross-correlation peak value

snclq2 TEXT

The neighboring station with a similarly oriented sensor component

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Pressure Effects Metric


Description

The correlation coefficient of a seismic channel and an LDO pressure channel.Large correlation coefficients may indicate the presence of atmospheric effects in the seismic data.
Please consult the Detailed Documentation

metric=pressure_effects


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

A correlation coefficient.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Sample Max Metric


Description

This metric reports largest amplitude value in counts encountered within a 24-hour window.
Please consult the Detailed Documentation

metric=sample_max


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Max value.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Sample Mean Metric


Description

This metric reports the average amplitude value in counts over a 24-hour window. This mean is one measure of the central tendency of the amplitudes that is calculated from every amplitude value present in the time series. The mean value itself may not occur as an amplitude value in the times series.
Please consult the Detailed Documentation

metric=sample_mean


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Mean value.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Sample Median Metric


Description

This metric reports the middle amplitude value in counts of sorted amplitude values from a 24-hour window. This median is one measure of the central tendency of the amplitudes in a time series when values are arranged in sorted order. The median value itself always occurs as an amplitude value in the times series.
Please consult the Detailed Documentation

metric=sample_median


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Median value.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Sample Min Metric


Description

This metric reports smallest amplitude value in counts encountered within a 24-hour window.
Please consult the Detailed Documentation

metric=sample_min


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Min value.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Sample RMS


Description

Displays the RMS variance of trace amplitudes within a 24-hour window.
Please consult the Detailed Documentation

metric=sample_rms


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

RMS variance.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Sample SNR


Description

A ratio of the RMS variance calculated from data 30 seconds before and 30 seconds following the predicted first-arriving P phase.
Please consult the Detailed Documentation

metric=sample_snr


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

The signal to noise ratio.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Sample Unique Metric


Description

This metric reports the number (count) of unique values in data trace over a 24-hour window.
Please consult the Detailed Documentation

metric=sample_unique


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Count unique values.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Spikes Metric


Description

The number of times that the 'Spikes detected' bit in the 'dq_flags' byte is set within a miniSEED file. This data quality flag is set by some dataloggers in the fixed section of the miniSEED header when short-duration spikes have been detected in the data. Because spikes have shorter duration than the natural period of most seismic sensors, spikes often indicate a problem introduced at or after the datalogger.
Please consult the Detailed Documentation

metric=spikes


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Spikes detected (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Station Completeness Metric


Description

Average completeness all open channels at a station.
Please consult the Detailed Documentation

metric=station_completeness


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Average percent availability at a station.

quality_flag INTEGER

Number of channels in the metric request for which MUSTANG contains no availability metric [0 = 100% complete].

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Suspect Time Tag Metric


Description

The number of times that the 'Time tag is questionable' bit in the 'dq_flags' byte is set within a miniSEED file. This metric can be used to identify stations with GPS locking problems and data days with potential timing issues.
Please consult the Detailed Documentation

metric=suspect_time_tag


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Time tag is questionable (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Telemetry Sync Error Metric


Description

The number of times that the 'Telemetry synchronization error' bit in the 'dq_flags' byte is set within a miniSEED file. This metric can be searched to determine which stations may have telemetry problems or to identify or omit gappy data from a data request.
Please consult the Detailed Documentation

metric=telemetry_sync_error


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Telemetry synchronization error (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Timing Correction Metric


Description

The number of times that the 'Time correction applied' bit in the 'act_flags' byte is set within a miniSEED file. This clock quality flag is set by the network operator in the fixed section of the miniSEED header when a timing correction stored in field 16 of the miniSEED fixed header has been applied to the data's original time stamp. A value of 0 means that no timing correction has been applied.
Please consult the Detailed Documentation

metric=timing_correction


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Time correction applied (count).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Timing Quality Metric


Description

Daily average of the SEED timing quality stored in miniSEED blockette 1001. This value is vendor specific and expressed as a percentage of maximum accuracy.Percentage is NULL if not present in the miniSEED.
Please consult the Detailed Documentation

metric=timing_quality


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value DOUBLE PRECISION

Average timing quality in percent.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Total Latency Metric


Description

Total latency is the time in seconds since a channel's most recent data sample from the data center disk buffer was acquired in the field. It is the sum of the data and feed latencies. MUSTANG measures total latency every four hours. The normal operating value for total latency is largely station-dependent, so it can vary widely. Channels with lower sample rates generally have longer total latencies since it takes longer to fill a telemetry packet or SEED record.
Please consult the Detailed Documentation

metric=total_latency


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain value=X to retrieve only measurements with that value, or value_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
value INTEGER

Latency (s).

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.


Transfer Function Metric


Description

Transfer function metric consisting of the gain ratio, phase difference and magnitude squared of two colocated sensors.
Please consult the Detailed Documentation

metric=transfer_function


Metric Columns

These are stored in the database and are returned by the measurements service. They can also be used to filter queries to that service.

For example, the query URL could contain gain_ratio=X to retrieve only measurements with that value, or gain_ratio_gt=X for measurements that exceed X.

The available extensions for parameter names are:

  • _eq - Equal (the default if no extension is used).
  • _ne - Not equal.
  • _gt - Greater than.
  • _ge - Greater than or equal.
  • _lt - Less than.
  • _le - Less than or equal.

Name Type Description
gain_ratio DOUBLE PRECISION

The gain transfer function ratio divided by the metadata amplitude response ratio for coincident channel pairs.

phase_diff DOUBLE PRECISION

The phase transfer function difference divided by the metadata phase response difference for coincident channel pairs.

ms_coherence DOUBLE PRECISION

The magnitude squared coherence between coincident channel pairs.

start TIMESTAMPTZ

The start time of a measurement for this metric.

end TIMESTAMPTZ

The end time of a measurement for this metric.

lddate TIMESTAMPTZ

The Time when this measurement was added to the database.