Thread: Sac sintaxis for wiechert response correction

Started: 2018-12-05 17:29:25
Last activity: 2018-12-06 18:59:00
Topics: SAC Help
Raul Daniel Corona
2018-12-05 17:29:25
Hello
Can you help me with the correct syntax for Wiechert instruments response correction in SAC.
Who can I know which period, damping and magnification it's the algorithm using by default?
I try this sintax :
"transfer from WIECH freeperiod 'To' magnification 'Am' damping 'e' "

And I also tried whitout specify the constants and the result its very similar.
Thank you all in advance

Raúl Daniel Corona
UNAM. Geophysics Institute
|
  • Milton Plasencia
    2018-12-06 02:59:49
    Hola Raul,

    want you apply the response file to sac file and convert it to Wiechert
    output?
    Please give a look in transfer command

    sac> help transfer

    I think it can clarify as work transfer command.

    Abrazo,

    Milton

    ----------------------------
    Milton Plasencia
    mplasencia<at>inogs.it



    On Wed, Dec 5, 2018 at 6:30 PM Raul Daniel Corona <
    rdcorona<at>igeofisica.unam.mx> wrote:

    Hello
    Can you help me with the correct syntax for Wiechert instruments response
    correction in SAC.
    Who can I know which period, damping and magnification it's the algorithm
    using by default?
    I try this sintax :
    "transfer from WIECH freeperiod 'To' magnification 'Am' damping 'e' "

    And I also tried whitout specify the constants and the result its very
    similar.
    Thank you all in advance

    Raúl Daniel Corona
    UNAM. Geophysics Institute
    |

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  • Hi Raúl,
    Say you have the appropraite polezeros file (e.g. SAC_PZs_stat_BHZ) for the
    SAC file (e.g. stat.SAC) you are looking at. Then, you would do

    READ stat.SAC
    TRANSFER FROM POLEZERO SAC_PZs_stat_BHZ TO WEICH FREQ F1 F2 F3 F4

    Where F1, F2, F3, F4 are tapering frequency limits. As mentioned by Milton,
    take a look at the SAC Manual to better understand the use of TRANSFER.

    Januka


    Januka Attanayake
    Research Fellow | Earthquake Seismology
    Homepage: *https://sites.google.com/site/janukaattanayake
    https://sites.google.com/site/janukaattanayake*

    School of Earth Sciences | McCoy Bldg. 200
    University of Melbourne | Parkville 3010 VIC
    Australia




    On Thu, 6 Dec 2018 at 04:30, Raul Daniel Corona <rdcorona<at>igeofisica.unam.mx>
    wrote:

    Hello
    Can you help me with the correct syntax for Wiechert instruments response
    correction in SAC.
    Who can I know which period, damping and magnification it's the algorithm
    using by default?
    I try this sintax :
    "transfer from WIECH freeperiod 'To' magnification 'Am' damping 'e' "

    And I also tried whitout specify the constants and the result its very
    similar.
    Thank you all in advance

    Raúl Daniel Corona
    UNAM. Geophysics Institute
    |

    ----------------------
    SAC Help
    Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
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    • Raul Daniel Corona
      2018-12-06 01:30:11
      Hello.
      Thank You for your help.
      In this way the syntax is correct and works perfectly.
      However, if I want to remove the Wiechert response from a time serie, Still
      dont know what are the constants by default in the algoritm.

      I will keep searching and reading the SAC manuals.

      Thanks again both of you.

      El mié., 5 dic. 2018 a las 16:15, Geo . (<jattanayake<at>gmail.com>) escribió:

      Hi Raúl,
      Say you have the appropraite polezeros file (e.g. SAC_PZs_stat_BHZ) for
      the SAC file (e.g. stat.SAC) you are looking at. Then, you would do

      READ stat.SAC
      TRANSFER FROM POLEZERO SAC_PZs_stat_BHZ TO WEICH FREQ F1 F2 F3 F4

      Where F1, F2, F3, F4 are tapering frequency limits. As mentioned by
      Milton, take a look at the SAC Manual to better understand the use of
      TRANSFER.

      Januka


      Januka Attanayake
      Research Fellow | Earthquake Seismology
      Homepage: *https://sites.google.com/site/janukaattanayake
      https://sites.google.com/site/janukaattanayake*

      School of Earth Sciences | McCoy Bldg. 200
      University of Melbourne | Parkville 3010 VIC
      Australia




      On Thu, 6 Dec 2018 at 04:30, Raul Daniel Corona <
      rdcorona<at>igeofisica.unam.mx> wrote:

      Hello
      Can you help me with the correct syntax for Wiechert instruments
      response correction in SAC.
      Who can I know which period, damping and magnification it's the
      algorithm using by default?
      I try this sintax :
      "transfer from WIECH freeperiod 'To' magnification 'Am' damping 'e' "

      And I also tried whitout specify the constants and the result its very
      similar.
      Thank you all in advance

      Raúl Daniel Corona
      UNAM. Geophysics Institute
      |

      ----------------------
      SAC Help
      Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
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      --
      *​ Raúl Daniel Corona Fernández*

      * Universidad Nacional Autónoma de México **Instituto de **Geofísica*
      * Posgrado en Ciencias de la Tierra *

      • Check this thread from 2015.

        http://www.iris.washington.edu/pipermail/sac-help/2015-June/001989.html

        Januka Attanayake
        Research Fellow | Earthquake Seismology
        Homepage: *https://sites.google.com/site/janukaattanayake
        https://sites.google.com/site/janukaattanayake*

        School of Earth Sciences | McCoy Bldg. 200
        University of Melbourne | Parkville 3010 VIC
        Australia




        On Thu, 6 Dec 2018 at 10:30, Raúl Daniel Corona Fernández <
        rdcorona<at>igeofisica.unam.mx> wrote:

        Hello.
        Thank You for your help.
        In this way the syntax is correct and works perfectly.
        However, if I want to remove the Wiechert response from a time serie,
        Still dont know what are the constants by default in the algoritm.

        I will keep searching and reading the SAC manuals.

        Thanks again both of you.

        El mié., 5 dic. 2018 a las 16:15, Geo . (<jattanayake<at>gmail.com>)
        escribió:

        Hi Raúl,
        Say you have the appropraite polezeros file (e.g. SAC_PZs_stat_BHZ) for
        the SAC file (e.g. stat.SAC) you are looking at. Then, you would do

        READ stat.SAC
        TRANSFER FROM POLEZERO SAC_PZs_stat_BHZ TO WEICH FREQ F1 F2 F3 F4

        Where F1, F2, F3, F4 are tapering frequency limits. As mentioned by
        Milton, take a look at the SAC Manual to better understand the use of
        TRANSFER.

        Januka


        Januka Attanayake
        Research Fellow | Earthquake Seismology
        Homepage: *https://sites.google.com/site/janukaattanayake
        https://sites.google.com/site/janukaattanayake*

        School of Earth Sciences | McCoy Bldg. 200
        University of Melbourne | Parkville 3010 VIC
        Australia




        On Thu, 6 Dec 2018 at 04:30, Raul Daniel Corona <
        rdcorona<at>igeofisica.unam.mx> wrote:

        Hello
        Can you help me with the correct syntax for Wiechert instruments
        response correction in SAC.
        Who can I know which period, damping and magnification it's the
        algorithm using by default?
        I try this sintax :
        "transfer from WIECH freeperiod 'To' magnification 'Am' damping 'e' "

        And I also tried whitout specify the constants and the result its very
        similar.
        Thank you all in advance

        Raúl Daniel Corona
        UNAM. Geophysics Institute
        |

        ----------------------
        SAC Help
        Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
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        Sent from the IRIS Message Center (http://ds.iris.edu/message-center/)
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        ----------------------
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        --
        *​ Raúl Daniel Corona Fernández*

        * Universidad Nacional Autónoma de México **Instituto de **Geofísica*
        * Posgrado en Ciencias de la Tierra *


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