[SAC-HELP] how to use sac function synchronize effectively

[Januka Attanayake]

If you want to recover the  zero padded "whole" trace you could use the OMARKER header. It's the length of time missing from the sac trace that you download from IRIS. For example, you might be able to use something like the following macro -- adds zeros from the origin time to the starting point of your trace using cuterr fillz. I am guessing this will automatically adjust your start time but please double check and modify as needed.

DO FILE WILD *.BHZ.R.SAC*
  READ $FILE
  SETBB OMKR &1,OMARKER
  GETBB OMKR

  xlim T0 -10 10
  p
  CUT ON
  CUTERR FILLZ
  CUT b %OMKR e
  READ $FILE
  WRITE OVER
ENDDO
CUT OFF

_______________Serenity isn't freedom from the storm, but peace within the storm
  Januka Attanayake   Global Seismology & Economics
The University of Connecticut 
Beach Hall - U2045
354, Mansfield Rd; 
Storrs, CT 06269
Tel :  860 486 0475 (Office)
          860 486 3914 (Lab - P405)
    URL: http://sites.google.com/site/janukaattanayake/






--- On Mon, 3/21/11, Shutian Ma <shutian33 at yahoo.ca> wrote:

From: Shutian Ma <shutian33 at yahoo.ca>
Subject: [SAC-HELP] how to use sac function synchronize effectively
To: sac-help at iris.washington.edu
Date: Monday, March 21, 2011, 9:47 AM


Dear colleagues,

Recently we transferred some waveform records from IRIS. These records generated by the same earthquake do not have the same start time. As we need all the records generated by the same earthquake have the same start time to make measurement we tried to use sac2000 function synchronize. After we used the function and used lh we found all the ktime? are same. When we display those waveform records processed by the function synchronize, we found the original start times are still kept.
Could you tell me how to use the synchronize function effectively?
Do you have another way to make all the records generated by the same earthquake have the same start time?
Thanks in advance,
Shutian   

_______________________________________________
sac-help mailing list
sac-help at iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/sac-help



      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.iris.washington.edu/pipermail/sac-help/attachments/20110321/71351838/attachment.html>