Thread: Problem with transfer function

Started: 2012-12-24 03:04:49
Last activity: 2012-12-24 20:57:06
Topics: SAC Help
Abhash Kumar
2012-12-24 03:04:49
Hi,
I am trying to remove the instrument response from the data using
transfer function as shown below:

SAC> r 2010.332.14.48.FS12.BHZ
SAC> rmean
SAC> transfer from polezero s FS12_ZVBB.zp
ERROR 1:

My pole-zero file for station FS12 is
CONSTANT 3.605e+17
ZEROS 2
0.00E+00 0.00E+00
0.00E+00 0.00E+00
POLES 5
-3.701E-02 3.701E-02
-3.701E-02 -3.701E-02
-1.131E+03 0.000E+00
-1.005E+03 0.000E+00
-5.027E+02 0.000E+00

I am unable to understand why this error is appearing. Though I am
following the same format for pole-zero files for rest of the stations in
my network but SAC is having problem only with few stations. I have double
checked the response files from the IRIS, DMC website for this station
(FS12) and all the values are exactly same as it is in my pole-zero file. I
would really appreciate your advice.

Thanks
Abhash Kumar
University of North Carolina at Chapel Hill
USA

  • Brian Savage
    2012-12-24 18:01:47
    Dear Abhash Kumar,

    Which version of sac are you using? I believe this was fixed in a recent update
    Please try these same commands and files with the most recent version from IRIS and see if the problem presists.

    Cheers,
    Brian

    On Dec 23, 2012, at 7:04 PM, Abhash Kumar wrote:

    Hi,
    I am trying to remove the instrument response from the data using transfer function as shown below:

    SAC> r 2010.332.14.48.FS12.BHZ
    SAC> rmean
    SAC> transfer from polezero s FS12_ZVBB.zp
    ERROR 1:

    My pole-zero file for station FS12 is
    CONSTANT 3.605e+17
    ZEROS 2
    0.00E+00 0.00E+00
    0.00E+00 0.00E+00
    POLES 5
    -3.701E-02 3.701E-02
    -3.701E-02 -3.701E-02
    -1.131E+03 0.000E+00
    -1.005E+03 0.000E+00
    -5.027E+02 0.000E+00

    I am unable to understand why this error is appearing. Though I am following the same format for pole-zero files for rest of the stations in my network but SAC is having problem only with few stations. I have double checked the response files from the IRIS, DMC website for this station (FS12) and all the values are exactly same as it is in my pole-zero file. I would really appreciate your advice.

    Thanks
    Abhash Kumar
    University of North Carolina at Chapel Hill
    USA
    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help



  • George Helffrich
    2012-12-24 18:37:58
    Dear All -

    This question was answered in September this year on the list.

    This (unhelpful) error message arises when SAC cannot decode a number in a pole-zero file. Suggest that you look carefully at its contents to see whether any non-printing characters are present, tabs used rather than spaces, etc. Also make sure you're typing the correct file name on the TRANSFER command.

    On 24 Dec 2012, at 00:04, Abhash Kumar wrote:

    Hi,
    I am trying to remove the instrument response from the data using transfer function as shown below:

    SAC> r 2010.332.14.48.FS12.BHZ
    SAC> rmean
    SAC> transfer from polezero s FS12_ZVBB.zp
    ERROR 1:

    My pole-zero file for station FS12 is
    CONSTANT 3.605e+17
    ZEROS 2
    0.00E+00 0.00E+00
    0.00E+00 0.00E+00
    POLES 5
    -3.701E-02 3.701E-02
    -3.701E-02 -3.701E-02
    -1.131E+03 0.000E+00
    -1.005E+03 0.000E+00
    -5.027E+02 0.000E+00

    I am unable to understand why this error is appearing. Though I am following the same format for pole-zero files for rest of the stations in my network but SAC is having problem only with few stations. I have double checked the response files from the IRIS, DMC website for this station (FS12) and all the values are exactly same as it is in my pole-zero file. I would really appreciate your advice.

    Thanks
    Abhash Kumar
    University of North Carolina at Chapel Hill
    USA
    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help



    George Helffrich
    george.helffrich<at>bris.ac.uk



  • Vladimir Karpinsky
    2012-12-24 20:57:06
    Hi!

    24.12.2012 4:04, Abhash Kumar wrote:
    SAC> transfer from polezero s FS12_ZVBB.zp

    You have to specify frequency band. Command line should looks like:

    SAC> trans from polezero s ./PAZ.paz to none freq 0.05 0.1 30 50

    By the way, rtr and taper commands are beneficial before trans.


    --
    Best regards,
    Vladimir..

Page built 11:13:37 | v.b'ea7a92