SAGE Facility MUSTANG metrics Web Service Documentation

sample_max Maximum amplitude in counts

Summary

This metric reports largest amplitude value in counts encountered within a 24-hour window.

Uses

Along with the minimum value, the maximum amplitude is the time series’ most extreme value or largest outlier. A healthy instrument recording noise will have a roughly Gaussian distribution with the minimum and maximum amplitudes being roughly symmetric about the mean and median. Departures from this could indicate less than ideal instrument behavior.

Data Analyzed

Traces – one N.S.L.C (Network.Station.Location.Channel) per measurement
Window – 24 hours starting at 00:00:00 UTC
Data SourceIRIS miniSEED archive or IRIS PH5 archive

SEED Channel Types – ?H?, ?L?, ?N?, ?G?, ?P?, VM? | High Gain, Low Gain, Accelerometer, Gravimeter, Geophone, Mass Channels

Algorithm

  • Request 24 hours of data for a single N.S.L.C.
  • Identify and report the maximum amplitude value for the requested data:
    For i=1,N samples in the time series x:
       if (x(i) > current_max) {current_max = x(i)}
    

Metric Values Returned

value – maximum amplitude in counts
target – the trace analyzed, labeled as N.S.L.C.Q (Network.Station.Location.Channel.Quality)
start – beginning of the data day requested (00:00:00 UTC)
end – end of the data day requested (truncated as 23:59:59 UTC)
lddate – date/time the measurement was made and loaded into the MUSTANG database (UTC)

Notes

Instrument response has not been removed.

Contact

See Also

Updated