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earllatepicker: take half wavelength for getting earliest possible pick as suggested by Diehl et al..

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Ludger Küperkoch 2015-11-11 14:51:14 +01:00
parent cd26d85f7c
commit c01c88b657
1 changed files with 3 additions and 4 deletions
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7
pylot/core/pick/utils.py
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@ -8,7 +8,7 @@
:author: Ludger Kueperkoch / MAGS2 EP3 working group
"""
import pdb
import numpy as np
import matplotlib.pyplot as plt
from obspy.core import Stream, UTCDateTime
@ -91,9 +91,8 @@ def earllatepicker(X, nfac, TSNR, Pick1, iplot=None, stealthMode = False):
# determine all zero crossings in signal window (demeaned)
zc = crossings_nonzero_all(x[pis] - x[pis].mean())
# calculate mean half period T0 of signal as the average of the
T0 = np.mean(np.diff(zc)) * X[0].stats.delta # this is half wave length
# T0/4 is assumed as time difference between most likely and earliest possible pick!
EPick = Pick1 - T0 / 2
T0 = np.mean(np.diff(zc)) * X[0].stats.delta # this is half wave length!
EPick = Pick1 - T0 # half wavelength as suggested by Diehl et al.
# get symmetric pick error as mean from earliest and latest possible pick