Thread: Conversion SEED to SAC

Started: 2012-07-18 23:06:53
Last activity: 2012-07-18 23:06:53
Topics: SAC Help
Stephane Drouet
Conversion SEED to SAC
2012-07-18 23:06:53
Dear SAC users,

I am facing a problem with rdseed. I want to convert miniSEED data
into SAC. I have both a miniSEED file and a dataless file, and I used
the command:
rdseed -d -f file.miniSEED -g file.DATALESS
Instead of getting a single output SAC file, I have many of them.
There are no gaps in my miniSEED data but within the volume there are
as many blocks of data spanning different time intervals as output SAC
files.
I would like to know if there is an option with rdseed to tell the
program to make a unique output file. If not, is there a way to "cat"
the output SAC files in order to create a single one?

I don't know if I correctly explain my problem, since I am a new user
of SEED data maybe my vocabulary is not very accurate.

Best Regards,

Stéphane Drouet

--------------------------------
Seismologist, PhD
Observatório Nacional
Rua General José Cristino 77
CEP: 20921-400
Bairro Imperial de São Cristóvão
Rio de Janeiro - RJ - Brazil




  • Robert Casey
    Re: Conversion SEED to SAC
    2012-07-18 20:34:56

    Hi Stephane-

    If the SAC files split along channels and stations, this is normal.
    The SAC format will only allow one station/channel per file. If you
    encounter multiple files for a single station/channel, it would
    suggest that there are time tears in the data. They can be very small
    sometimes, so you can adjust this gap sensitivity out by setting the
    SEEDTOLERANCE value to a high number like 10000. The danger of this
    is that the data will be pressed together in one file and you won't be
    aware of either the time breaks for the resultant shift in time that
    begins to accumulate.

    I am not aware of a way to have all of the SAC output piped to stdout
    or to a single unique output file. rdseed is designed to create
    specially named files when writing SAC.

    -Rob


    On Jul 18, 2012, at 12:06 PM, stephane<at>on.br wrote:

    Dear SAC users,

    I am facing a problem with rdseed. I want to convert miniSEED data
    into SAC. I have both a miniSEED file and a dataless file, and I
    used the command:
    rdseed -d -f file.miniSEED -g file.DATALESS
    Instead of getting a single output SAC file, I have many of them.
    There are no gaps in my miniSEED data but within the volume there
    are as many blocks of data spanning different time intervals as
    output SAC files.
    I would like to know if there is an option with rdseed to tell the
    program to make a unique output file. If not, is there a way to
    "cat" the output SAC files in order to create a single one?

    I don't know if I correctly explain my problem, since I am a new
    user of SEED data maybe my vocabulary is not very accurate.

    Best Regards,

    Stéphane Drouet

    --------------------------------
    Seismologist, PhD
    Observatório Nacional
    Rua General José Cristino 77
    CEP: 20921-400
    Bairro Imperial de São Cristóvão
    Rio de Janeiro - RJ - Brazil



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