Trigger ar_pick

1

Hello!
I used the obspy ar_pick function for P and S arrivals on some traces. I have two issues:

  1. For a particular trace I used to have access violation error but worked on others. A rough fix was to use a try and except.
  2. A more serious issue was that initially I got both p and s arrivals but after using for some time I have started getting only p arrival. The s is zero. I tried debugging but could not find any solution. Even if I copy and paste an example from tutorial I get the same behaviour.
    I will be highly grateful for your reply as I am quite stuck at this issue.
    regards,
    gulrukh
2

  1. sounds similar to this: Access violation when using ar_pick algorithm · Issue #2642 · obspy/obspy · GitHub

  2. Hmm… not sure what’s going on, but you say that you used to get P+S and now with the same data you only get P? That sounds weird…

3

The first issue occurs on just one particular event data and works on all others. At least I have a rough work around but the second problem is really more frustrating as nothing seems to fix it. I used to have both P and S using the same code and data but get only the P arrival now no matter what I try. I have no idea where this is coming from.

4

I’d ask you to maybe try an older obspy version if it used to give different results, but the last change in AR I can see is from obspy 1.2.0, so I don’t think goin back in obspy versions should make a difference.
I also don’t use that routine myself, so can’t really say much.