[SAC-HELP] HELP!

[Brian Savage]

Dear Megan

If you could either send me the sac file so I can examine it or run  
the following command

% od -d -j 304 filename.sac | head -1
It should output something like this:
0000460     6     0 53191 65535 53191 65535   100     0

The first number you can ignore, but the second number is the version  
number, it should be 6 or less.

od is "octal dump", -d indicates a decimal output, and -j is a jump to  
a number of bytes in the file. In this case 304 bytes (4 * 76).

Thanks
Brian Savage
savage at uri.edu

On Jun 21, 2010, at 4:44 PM, Arthur Snoke wrote:

>> I'm having a SAC problem. I'm running a program to digitize paper  
>> seismograms. My digitization program saves the files I create  
>> as .SAC files. I got one digitized and saved it as .SAC but when I  
>> tried to read the file into SAC I got the following error:
>>
>> ERROR 1318: Header in disk file is out of date:  myfile
>> Header version number is incorrect.
>>
>> Header seems byte-swapped—byte-swap file and retry.
>>
>> I looked up sac help online and I got : http://www.iris.washington.edu/pipermail/sac-help/2010-March/000711.html 
>>  but that didn't work =( SAC is telling me that sactosac -m is not  
>> a valid command.  I would really appreciate any help/ideas asap.
>
> When you say you are writing it as a SAC file, what software are you  
> using?  Also, what version of SAC are you using?  The version of SAC  
> provided by IRIS (current version 101.4) can read either endian.  I  
> find that sactosac is a program (not command) in the MACSAC package,  
> which is not the same as IRIS SAC.  Even though it is no longer  
> necessary, IRIS SAC comes with a utility program sacswap that can  
> switch endian.
>
> The listed error message for the READ command in SAC are
>
> - 0101: opening file
> - 0108: File does not exist:
> - 0114: reading file
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