Dear obspy community,
I am trying to align the waveforms using cross correlation after selecting a fix window with reference to first arrival using concept from This link . Each trace is 30 seconds long with both P and S arrival.
I found that my code works very well for some traces of events but later, it gives errors for otehr traces even using same parameters.
Exception: Trace 0 starts too late.,
I have tried to further read the code and found that there is a very minor difference in tr.stats.starttime and start as mention below:
tr.stats.starttime = 2020-06-01T20:10:06.353000Z, start= 2020-06-01T20:10:05.403000Z
if tr.stats.starttime > start:
msg = “Trace %s starts too late.” % _i
raise Exception(f"{msg}, {tr.stats.starttime },{start}")
if tr.stats.endtime < end:
msg = “Trace %s ends too early.” % _i
My Code looks like :
t1 = st1[0].stats.starttime
P1 = st1[0].stats.sac.a
dist= st1[0].stats.sac.user3 #distance from fault center
t2 = st2[0].stats.starttime
sta2 = st2[0].stats.sac.kstnm
P2 = st2[0].stats.sac.a
tr1 = st1[0].trim(starttime=t1+P1,endtime=t1+P1+3)
tr2 = st2[0].trim(starttime=t2+P2,endtime=t2+P2+3)
dt, coeff = xcorr_pick_correction(t1+P1, tr1, t2+P2, tr2, 0.5, 0.2, 0.9)
Is there any suggestion to overcome this issue?