[Antelope] overlapping wf records

[Jonathan MacCarthy]

Hello Antelope users,

I'm new to Antelope, and I've been looking for a command/trick that  
might solve a problem I'm having, but with no luck so far.   I'm  
hoping someone might have a suggestion; any help would be much  
appreciated...
With my origin, site, and wfdisc tables, I'm doing the canonical  
"extract parrival-30sec to parrival+60sec from wfdisc holdings", but  
I'm running into overlap problems.  My wfdisc is populated by  
downloading P-60sec to P+120sec from IRIS for select events.  The  
problem is due to a few of those origins being close to each other in  
time & space such that my " parrival-30sec to parrival+60sec" call for  
the earlier event also grabs from wfdisc records intended to be  
associated with the later event.  Here's an example for database name  
"TA":

The events...
 >> dbsubset TA.origin 'orid == 16 || orid == 17' | dbselect - orid  
lat lon depth 'strtime(time)'
       16   36.1780  141.5450   19.0000  5/07/2008  16:02:02.600
       17   36.2260  141.7660   35.0000  5/07/2008  16:03:40.430

The extract call:
 >> dbjoin TA.origin TA.site | dbsubset - 'orid==16' | dbjoin - :sta  
':parrival()-30::parrival()+60#time::endtime' wfdisc | dbselect - orid  
sta chan 'strtime(wfdisc.time)' 'strtime(parrival())'  
'strtime(wfdisc.endtime)' 'dir . "/" . dfile' | head
       16 SRU    BHZ       5/07/2008  16:13:00.965  5/07/2008   
16:14:08.829  5/07/2008  16:16:20.715 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_02_02/UU.SRU.BHZ.sac
       16 SRU    BHE       5/07/2008  16:13:04.090  5/07/2008   
16:14:08.829  5/07/2008  16:16:14.715 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_02_02/UU.SRU.BHE.sac
       16 SRU    BHN       5/07/2008  16:13:05.390  5/07/2008   
16:14:08.829  5/07/2008  16:16:19.690 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_02_02/UU.SRU.BHN.sac
       16 SRU    BHN       5/07/2008  16:14:31.040  5/07/2008   
16:14:08.829  5/07/2008  16:17:44.940 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_03_40/UU.SRU.BHN.sac
       16 SRU    BHZ       5/07/2008  16:14:37.690  5/07/2008   
16:14:08.829  5/07/2008  16:18:00.690 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_03_40/UU.SRU.BHZ.sac
       16 SRU    BHE       5/07/2008  16:14:43.640  5/07/2008   
16:14:08.829  5/07/2008  16:17:52.715 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_03_40/UU.SRU.BHE.sac
       16 ISCO   BHN       5/07/2008  16:10:51.224  5/07/2008   
16:14:21.957  5/07/2008  16:18:30.024 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_02_02/US.ISCO.BHN.sac
       16 ISCO   BHE       5/07/2008  16:11:19.049  5/07/2008   
16:14:21.957  5/07/2008  16:18:55.199 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_02_02/US.ISCO.BHE.sac
       16 ISCO   BHZ       5/07/2008  16:13:22.874  5/07/2008   
16:14:21.957  5/07/2008  16:18:08.124 /fs/scratch/jkmacc/Data/CREST/TA/ 
P/wf/Event_2008_128_16_03_40/US.ISCO.BHZ.sac
...

I've output 3 times: parrival-30sec, parrival, and parrival+60sec, so  
that the overlapping wfdisc times are apparent.  I've also output the  
the "dir" field to demonstrate that the files are from different event  
directories.
Is there some way to combine overlapping wfdisc records so that this  
doesn't happen, or to otherwise distinguish between the records I want  
and the ones I don't?

Thanks for your help!

Best,
Jonathan MacCarthy


Jonathan MacCarthy
PhD Candidate in Seismology
New Mexico Institute of Mining and Technology
Dept. of Earth and Environmental Science, MSEC208
801 Leroy Place
Socorro, NM 87801
ph: 505.835.5418
web: www.ees.nmt.edu/~jkmacc

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