obspy.signal.polarization.vidale_adapt¶

vidale_adapt(stream, noise_thres, fs, flow, fhigh, spoint, stime, etime, adaptive=True)[source]¶

Adaptive window polarization analysis after [Vidale1986] with the modification of adapted analysis window estimated by estimating the instantaneous frequency. It returns the azimuth, incidence, rectilinearity planarity and ellipticity.

Parameters:

stream (Stream) ZNE containing trace data noise_thres (float) Variance of the noise sphere; data points are excluded when falling within the sphere of radius sqrt(noise_thres), Default = 0 fs (float) sampling rate flow (float) lower frequency limit for analysis fhigh (float) upper frequency limit for analysis spoint (numpy.ndarray) array with traces’ individual start times in samples stime (UTCDateTime) start time of the analysis etime (UTCDateTime) end time for the analysis adaptive (bool) switch for adaptive window estimation (defaults to True). If set to False, the window will be estimated as 3 * max(1/(fhigh-flow), 1/flow).

Returns:

list of tuples containing azimuth, incidence, rectilinearity, planarity, and ellipticity