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  1. ObsPy Documentation (1.2.0)
  2. ObsPy Library Reference
  3. obspy.signal - Signal processing routines for ObsPy
  4. obspy.signal.trigger

12.2.2. obspy.signal.trigger.carl_sta_trig

carl_sta_trig(a, nsta, nlta, ratio, quiet)[source]

Computes the carlSTAtrig characteristic function.

eta = star - (ratio * ltar) - abs(sta - lta) - quiet

Parameters:
  • a (NumPy ndarray) Seismic Trace
  • nsta (int) Length of short time average window in samples
  • nlta (int) Length of long time average window in samples
  • ratio as ratio gets smaller, carl_sta_trig gets more sensitive
  • quiet (float) as quiet gets smaller, carl_sta_trig gets more sensitive
Return type:

NumPy ndarray
Returns:

Characteristic function of CarlStaTrig