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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 :author: Ludger Kueperkoch / MAGS2 EP3 working group
""" """
import pdb
import numpy as np import numpy as np
import matplotlib.pyplot as plt import matplotlib.pyplot as plt
from obspy.core import Stream, UTCDateTime 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) # determine all zero crossings in signal window (demeaned)
zc = crossings_nonzero_all(x[pis] - x[pis].mean()) zc = crossings_nonzero_all(x[pis] - x[pis].mean())
# calculate mean half period T0 of signal as the average of the # 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 = 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 # half wavelength as suggested by Diehl et al.
EPick = Pick1 - T0 / 2
# get symmetric pick error as mean from earliest and latest possible pick # get symmetric pick error as mean from earliest and latest possible pick