Thread: Issues with resp files for some data IRIS DMC

Started: 2015-08-17 17:55:08
Last activity: 2015-08-28 23:18:19
Topics: SAC Help
Thulasiraman Natarajan
2015-08-17 17:55:08
Dear members,

I am trying to use IRIS DMC data from "Bhuj aftershock study" network.
(http://ds.iris.edu/gmap/YA?timewindow=2001-2001).

My attempts with removing instrument response produced unrealistic
amplitudes for all the three components.

I followed these steps:
Downloaded mseed and dataless files
Extracted the SAC formated data and response files using rdseed
In SAC, read the data and removed the instrument response using following
steps,
* rmean
* rtrend
* taper
* transfer from evalresp <>

It seems the resp files generated using rdseed from mseed and dataless
files are incomplete / wrong.

Could someone help me with this issue?

PS: I could not attach files with this mail, hence, please look at the
given link for data.

--
Thulasiraman

  • Arthur Snoke
    2015-08-17 14:46:44
    Have you included freqlimits? (http://ds.iris.edu/files/sac-manual/commands/transfer.html).

    I think in the past, attachments were allowed but only up to a specified maximum total size. I am not sure what the rules are since the listserv was ported to another server. However, you can always include the text from a sample run.

    Your link was no use.

    On Aug 17, 2015, at 1:25 AM, Thulasiraman Natarajan <geothulasi<at>gmail.com> wrote:

    Dear members,

    I am trying to use IRIS DMC data from "Bhuj aftershock study" network.
    (http://ds.iris.edu/gmap/YA?timewindow=2001-2001).

    My attempts with removing instrument response produced unrealistic amplitudes for all the three components.

    I followed these steps:
    Downloaded mseed and dataless files
    Extracted the SAC formated data and response files using rdseed
    In SAC, read the data and removed the instrument response using following steps,
    * rmean
    * rtrend
    * taper
    * transfer from evalresp <>

    It seems the resp files generated using rdseed from mseed and dataless files are incomplete / wrong.

    Could someone help me with this issue?

    PS: I could not attach files with this mail, hence, please look at the given link for data.

    --
    Thulasiraman

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    • Thulasiraman Natarajan
      2015-08-18 02:19:32
      Yes, I have included frequency limits.
      In this case, I have attempted for a frequency range of 5 - 50 Hz
      considering on the sensor's natural frequency and flat response given in
      IRIS site (
      http://www.iris.washington.edu/mda/YA/LOT1/01/EGE?timewindow=2001/02/13%2000:02:25-2001/02/22%2011:40:51).


      I have also attempted with different frequencies. However, the amplitudes
      of acceleration are as large as 2.0E15 NM/S/S.

      A note on the data and my request:
      -----------------------------------------------------
      The above link would give aftershocks (well clustered) data recorded at a
      station having about 50 - 80 km epicentral distances.
      The magnitudes are ~ M 2.0 - 5.0. (more details can be found from this
      paper and its supplement:
      http://www.ceri.memphis.edu/people/shorton/AFTERSHOCK/bhuj1.pdf).

      My current interest is to identify the specific aftershocks based on their
      peak accelerations.
      Thus, the unrealistic amplitudes obtained after removing instrument
      response are not helping.
      Few of my collaborators suggested that the response file and poles and
      zeros seem to be wrong.

      Despite the trouble, I wish if someone could try to get the data from above
      link and find a way to obtain more realistic signals.

      I sincerely appreciate the help. Thanks.

      --
      Thulasiraman







      On Mon, Aug 17, 2015 at 5:17 PM, Arthur Snoke <snoke<at>vt.edu> wrote:

      Have you included freqlimits? (
      http://ds.iris.edu/files/sac-manual/commands/transfer.html).

      I think in the past, attachments were allowed but only up to a specified
      maximum total size. I am not sure what the rules are since the listserv
      was ported to another server. However, you can always include the text
      from a sample run.

      Your link was no use.

      On Aug 17, 2015, at 1:25 AM, Thulasiraman Natarajan <geothulasi<at>gmail.com>
      wrote:

      Dear members,

      I am trying to use IRIS DMC data from "Bhuj aftershock study" network.
      (http://ds.iris.edu/gmap/YA?timewindow=2001-2001).

      My attempts with removing instrument response produced unrealistic
      amplitudes for all the three components.

      I followed these steps:
      Downloaded mseed and dataless files
      Extracted the SAC formated data and response files using rdseed
      In SAC, read the data and removed the instrument response using following
      steps,
      * rmean
      * rtrend
      * taper
      * transfer from evalresp <>

      It seems the resp files generated using rdseed from mseed and dataless
      files are incomplete / wrong.

      Could someone help me with this issue?

      PS: I could not attach files with this mail, hence, please look at the
      given link for data.

      --
      Thulasiraman

      ----------------------
      SAC Help (http://ds.iris.edu/message-center/topic/sac-help/)

      Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
      Update subscription preferences at http://ds.iris.edu/account/profile/




      ----------------------
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  • Robert Weekly
    2015-08-17 16:54:12
    Hello Thulasiraman,

    Can you please provide more information about how you downloaded the mseed and dataless files? Identifying the client you used to download the data may help with diagnosing the problem.

    Additionally, there is a list of known issues regarding rdseed (v 5.3.1) and SAC files (posted here <http://ds.iris.edu/ds/nodes/dmc/manuals/rdseed/), please take note and see if any of these conditions apply to your situation.

    The instrument response information for these sensors are also available through the IRIS web services, like our RESP service. (http://service.iris.edu/irisws/resp/1/query?net=YA&sta=BAC1&loc=01&cha=EPN&starttime=2001-02-14T00:01:04&endtime=2001-02-26T08:00:15) Would this be helpful to check your rdseed-derived values from?

    Thank you for your patience with this issue and for any further information you may be able to provide.

    -Robert

    _______________________________
    Robert Weekly
    Quality and Deployment System Engineer
    [e] rtweekly<at>iris.washington.edu



    On Aug 16, 2015, at 10:25 PM, Thulasiraman Natarajan <geothulasi<at>gmail.com> wrote:

    Dear members,

    I am trying to use IRIS DMC data from "Bhuj aftershock study" network.
    (http://ds.iris.edu/gmap/YA?timewindow=2001-2001).

    My attempts with removing instrument response produced unrealistic amplitudes for all the three components.

    I followed these steps:
    Downloaded mseed and dataless files
    Extracted the SAC formated data and response files using rdseed
    In SAC, read the data and removed the instrument response using following steps,
    * rmean
    * rtrend
    * taper
    * transfer from evalresp <>

    It seems the resp files generated using rdseed from mseed and dataless files are incomplete / wrong.

    Could someone help me with this issue?

    PS: I could not attach files with this mail, hence, please look at the given link for data.

    --
    Thulasiraman
    _______________________________________________
    irisdmc-help mailing list
    irisdmc-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/irisdmc-help


  • Mary Templeton
    2015-08-17 17:55:44
    Dear Thulasiraman,

    Thank you for your email about the YA 2001 responses. I've reviewed
    the RESP files and had some questions as well. I'm Ccing the network
    operator for this experiment - I think we need to know more about what
    instrumentation was used in order to assess the instrument responses.

    cheers,
    Mary Templeton
    IRIS DMC



    On Aug 16, 2015, at 11:25 PM, Thulasiraman Natarajan <geothulasi<at>gmail.com> wrote:

    Dear members,

    I am trying to use IRIS DMC data from "Bhuj aftershock study" network.
    (http://ds.iris.edu/gmap/YA?timewindow=2001-2001).

    My attempts with removing instrument response produced unrealistic amplitudes for all the three components.

    I followed these steps:
    Downloaded mseed and dataless files
    Extracted the SAC formated data and response files using rdseed
    In SAC, read the data and removed the instrument response using following steps,
    * rmean
    * rtrend
    * taper
    * transfer from evalresp <>

    It seems the resp files generated using rdseed from mseed and dataless files are incomplete / wrong.

    Could someone help me with this issue?

    PS: I could not attach files with this mail, hence, please look at the given link for data.

    --
    Thulasiraman
    _______________________________________________
    irisdmc-help mailing list
    irisdmc-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/irisdmc-help


    • Thulasiraman Natarajan
      2015-08-28 23:18:19
      Dear Mary Templeton,

      Thanks for your response.
      It seems the instruments used were K2+episensor for acceleration and an
      external Mark L28 for velocity.
      I could get a better resp file for the episensor (Thanks to Milton
      Plasencia) using the details mentioned in Bodin and Horton, 2004 BSSA. I
      could get PGA values comparable to the values reported by them. I am okay
      with this for my present work where I use the PGA values to pick weak and
      strong motion events relatively.

      However, it would be nice, if the correct resp files made available at
      IRIS.

      --
      Thulasiraman

      On Fri, Aug 28, 2015 at 5:02 AM, Mary Templeton <met<at>iris.washington.edu>
      wrote:

      Dear Thulasiraman,

      Thank you for your email about the YA 2001 responses. I've
      reviewed
      the RESP files and had some questions as well. I'm Ccing the network
      operator for this experiment - I think we need to know more about what
      instrumentation was used in order to assess the instrument responses.

      cheers,
      Mary Templeton
      IRIS DMC



      On Aug 16, 2015, at 11:25 PM, Thulasiraman Natarajan <geothulasi<at>gmail.com>
      wrote:

      Dear members,

      I am trying to use IRIS DMC data from "Bhuj aftershock study" network.
      (http://ds.iris.edu/gmap/YA?timewindow=2001-2001).

      My attempts with removing instrument response produced unrealistic
      amplitudes for all the three components.

      I followed these steps:
      Downloaded mseed and dataless files
      Extracted the SAC formated data and response files using rdseed
      In SAC, read the data and removed the instrument response using
      following steps,
      * rmean
      * rtrend
      * taper
      * transfer from evalresp <>

      It seems the resp files generated using rdseed from mseed and dataless
      files are incomplete / wrong.

      Could someone help me with this issue?

      PS: I could not attach files with this mail, hence, please look at the
      given link for data.

      --
      Thulasiraman
      _______________________________________________
      irisdmc-help mailing list
      irisdmc-help<at>iris.washington.edu
      http://www.iris.washington.edu/mailman/listinfo/irisdmc-help


      ----------------------
      SAC Help (http://ds.iris.edu/message-center/topic/sac-help/)

      Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
      Update subscription preferences at http://ds.iris.edu/account/profile/


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