Thread: Problem in SAC using sac macro

Started: 2007-08-15 09:07:09
Last activity: 2007-08-16 05:52:40
Topics: SAC Help
Sudhir Rajaure
2007-08-15 09:07:09
Dear Sir/Madam

I couldn't use the following macro to prepare waveforms for inversion in the
search of fault plane solution.

r %base%BHZ* %base%BHE* %base%BHN*

SAC exist with message "segmentation fault"

I think this problem arouse on account of small value of RAM (128 MB). Could
you please write the real cause and how to fix it?

Regards,

Sudhir

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To: sac-help<at>iris.washington.edu
Subject: sac-help Digest, Vol 26, Issue 2
Date: Fri, 3 Aug 2007 12:01:48 -0700 (PDT)

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Today's Topics:

1. Bug Report rsac1/rsac2 in sacio (Brian Savage)


----------------------------------------------------------------------

Message: 1
Date: Fri, 3 Aug 2007 10:40:37 -0400
From: Brian Savage <savage<at>uri.edu>
Subject: [SAC-HELP] Bug Report rsac1/rsac2 in sacio
To: SAC HELP <sac-help<at>iris.washington.edu>
Message-ID: <9617BFAB-73A0-4C83-B906-184FDBBC9EA2<at>uri.edu>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

SAC Users

A bug had been discovered when using rsac1() from the sacio library.
This bug also affects rsac2() as the function logic is essentially
the same.

Description:
If the sac file being read contains more data points than expected an
error value is not returned as it should be. A error return value
(variable nerr) of -803 should be returned but is this value is set
to 0 if no other errors are encountered. The number of data points
read in (variable nlen) will be returned and set to the maximum
number allowed (variable max).

Workaround:
If the number of data points rsac1 (or rsac2) returns as read
(variable nlen) is equal to the maximum number allowed (variable max)
there is a possibility that the requested file to be read contains
more points. Increase the size of the array and reread the file.

Fix: (Either 1 or 2)
1) This bug will be fixed in the next release of SAC
2) Request an updated rsac1() and rsac2() and recompile the sacio
library from source.

Cheers,
Brian Savage


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  • andreas wessel
    2007-08-16 05:52:40
    There are several things that cause this error message.

    Maybe your data has the wrong endianness? This is not a problem in the
    current version of SAC, but it was an issue in "veteran" versions.
    Which one are you using?

    Andreas

    On 8/15/07, Sudhir Rajaure <srajaure<at>hotmail.com> wrote:

    r %base%BHZ* %base%BHE* %base%BHN*

    SAC exist with message "segmentation fault"


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