Thread: help with MERGE syntax

Started: 2019-01-09 06:54:01
Last activity: 2019-01-14 19:34:12
Topics: SAC Help
Mitchell Liddell
2019-01-09 06:54:01
Mitchell Liddell <liddell<at>ualberta.ca>
10:33 PM (1 minute ago)
to sac-help

Hello,

I am attempting to merge several sac files into single day segments. My
commands are working if there is a gap in the data (fills in with 0s) but
if there is an overlap I get, for example, this error:

SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC
GS.OK030.00.HHZ.D.2015.327.062124.SAC
END1: 2015 327 6 24 50 580
BEG2: 2015 327 6 21 24 890

On the manual page for MERGE (
ds.iris.edu/files/sac-manual/commands/merge.html) there is an option to
make data overlaps average.

I could not find the syntax for applying the options for data gaps or
overlaps in MERGE. Can you help me with this?

Thank you!

Mitch

--
Mitch V. Liddell, PhD
Postdoctoral Researcher
University of Alberta
587-372-5060

  • Geo .
    2019-01-10 17:24:04
    Hi Mitch,
    Based on the manual, you have to instruct what SAC should do when you have
    gaps or overlapping time series.

    e.g.
    READ file1 file2
    MERGE GAP ZERO OVERLAP COMPARE

    Note that in place of ZERO you can use INTERP and in place of COMPARE you
    can use AVERAGE. It's a decision you will have to make. In your case, using
    AVERAGE might be better, although the decision should be based on the data
    you have.

    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, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca> wrote:


    Mitchell Liddell <liddell<at>ualberta.ca>
    10:33 PM (1 minute ago)
    to sac-help

    Hello,

    I am attempting to merge several sac files into single day segments. My
    commands are working if there is a gap in the data (fills in with 0s) but
    if there is an overlap I get, for example, this error:

    SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
    SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

    ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC
    GS.OK030.00.HHZ.D.2015.327.062124.SAC
    END1: 2015 327 6 24 50 580
    BEG2: 2015 327 6 21 24 890

    On the manual page for MERGE (
    ds.iris.edu/files/sac-manual/commands/merge.html) there is an option to
    make data overlaps average.

    I could not find the syntax for applying the options for data gaps or
    overlaps in MERGE. Can you help me with this?

    Thank you!

    Mitch

    --
    Mitch V. Liddell, PhD
    Postdoctoral Researcher
    University of Alberta
    587-372-5060

    ----------------------
    SAC Help
    Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
    Unsubscribe: sac-help-unsubscribe<at>lists.ds.iris.edu

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    • Mitchell Liddell
      2019-01-10 05:16:32
      Hello Januka,

      Thank you very much for the response. Unfortunately, if I run commands in
      that way I get an error because SAC thinks I'm trying to merge the file
      "GAP" to "ZERO" etc:

      SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
      GS.OK030.00.HHZ.D.2015.015.181259.SAC GS.OK030.00.HHZ.D.2015.015.212306.SAC
      GS.OK030.00.HHZ.D.2015.015.212213.SAC
      GS.OK030.00.HHZ.D.2015.015.180849.SAC GS.OK030.00.HHZ.D.2015.015.213111.SAC
      GS.OK030.00.HHZ.D.2015.015.000000.SAC

      SAC> MERGE GAP ZERO OVERLAP AVERAGE
      ERROR 108: File does not exist: GAP


      I don't know the syntax to make SAC know that I am providing the options
      rather than the file list, as there is no example on the manual page (
      https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows how to
      control these. Do you have any ideas?

      Best,

      Mitch


      On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com> wrote:

      Hi Mitch,
      Based on the manual, you have to instruct what SAC should do when you have
      gaps or overlapping time series.

      e.g.
      READ file1 file2
      MERGE GAP ZERO OVERLAP COMPARE

      Note that in place of ZERO you can use INTERP and in place of COMPARE you
      can use AVERAGE. It's a decision you will have to make. In your case, using
      AVERAGE might be better, although the decision should be based on the data
      you have.

      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, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca>
      wrote:


      Mitchell Liddell <liddell<at>ualberta.ca>
      10:33 PM (1 minute ago)
      to sac-help

      Hello,

      I am attempting to merge several sac files into single day segments. My
      commands are working if there is a gap in the data (fills in with 0s) but
      if there is an overlap I get, for example, this error:

      SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
      SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

      ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC
      GS.OK030.00.HHZ.D.2015.327.062124.SAC
      END1: 2015 327 6 24 50 580
      BEG2: 2015 327 6 21 24 890

      On the manual page for MERGE (
      ds.iris.edu/files/sac-manual/commands/merge.html) there is an option to
      make data overlaps average.

      I could not find the syntax for applying the options for data gaps or
      overlaps in MERGE. Can you help me with this?

      Thank you!

      Mitch

      --
      Mitch V. Liddell, PhD
      Postdoctoral Researcher
      University of Alberta
      587-372-5060

      ----------------------
      SAC Help
      Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
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      --
      Mitch V. Liddell, PhD
      Postdoctoral Researcher
      University of Alberta
      587-372-5060

      • Geo .
        2019-01-11 00:52:37
        Try
        READ *GS.OK030.00.HHZ.D.2015.015*.SAC

        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, 10 Jan 2019 at 15:16, Mitchell Liddell <liddell<at>ualberta.ca> wrote:

        Hello Januka,

        Thank you very much for the response. Unfortunately, if I run commands in
        that way I get an error because SAC thinks I'm trying to merge the file
        "GAP" to "ZERO" etc:

        SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
        GS.OK030.00.HHZ.D.2015.015.181259.SAC
        GS.OK030.00.HHZ.D.2015.015.212306.SAC GS.OK030.00.HHZ.D.2015.015.212213.SAC
        GS.OK030.00.HHZ.D.2015.015.180849.SAC
        GS.OK030.00.HHZ.D.2015.015.213111.SAC GS.OK030.00.HHZ.D.2015.015.000000.SAC

        SAC> MERGE GAP ZERO OVERLAP AVERAGE
        ERROR 108: File does not exist: GAP


        I don't know the syntax to make SAC know that I am providing the options
        rather than the file list, as there is no example on the manual page (
        https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows how
        to control these. Do you have any ideas?

        Best,

        Mitch


        On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com> wrote:

        Hi Mitch,
        Based on the manual, you have to instruct what SAC should do when you
        have gaps or overlapping time series.

        e.g.
        READ file1 file2
        MERGE GAP ZERO OVERLAP COMPARE

        Note that in place of ZERO you can use INTERP and in place of COMPARE you
        can use AVERAGE. It's a decision you will have to make. In your case, using
        AVERAGE might be better, although the decision should be based on the data
        you have.

        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, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca>
        wrote:


        Mitchell Liddell <liddell<at>ualberta.ca>
        10:33 PM (1 minute ago)
        to sac-help

        Hello,

        I am attempting to merge several sac files into single day segments. My
        commands are working if there is a gap in the data (fills in with 0s) but
        if there is an overlap I get, for example, this error:

        SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
        SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

        ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC
        GS.OK030.00.HHZ.D.2015.327.062124.SAC
        END1: 2015 327 6 24 50 580
        BEG2: 2015 327 6 21 24 890

        On the manual page for MERGE (
        ds.iris.edu/files/sac-manual/commands/merge.html) there is an option to
        make data overlaps average.

        I could not find the syntax for applying the options for data gaps or
        overlaps in MERGE. Can you help me with this?

        Thank you!

        Mitch

        --
        Mitch V. Liddell, PhD
        Postdoctoral Researcher
        University of Alberta
        587-372-5060

        ----------------------
        SAC Help
        Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
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        ----------------------
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        --
        Mitch V. Liddell, PhD
        Postdoctoral Researcher
        University of Alberta
        587-372-5060


        • Mitchell Liddell
          2019-01-10 09:59:16
          Hello Januka,

          I don't think the way that I'm reading in the files is the issue. I have
          tried reading in all the files at one time and then attempting merge, and
          also merging one by one like:

          r file1
          merge file2
          merge file3
          .
          .
          .
          write merged.sac

          This works as long as there are no overlaps because I can't find out how to
          use the option in the merge command.

          Does that make sense?

          Thanks!

          Mitch

          On Wed, Jan 9, 2019 at 10:54 PM Geo . <jattanayake<at>gmail.com> wrote:

          Try
          READ *GS.OK030.00.HHZ.D.2015.015*.SAC

          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, 10 Jan 2019 at 15:16, Mitchell Liddell <liddell<at>ualberta.ca>
          wrote:

          Hello Januka,

          Thank you very much for the response. Unfortunately, if I run commands in
          that way I get an error because SAC thinks I'm trying to merge the file
          "GAP" to "ZERO" etc:

          SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
          GS.OK030.00.HHZ.D.2015.015.181259.SAC
          GS.OK030.00.HHZ.D.2015.015.212306.SAC GS.OK030.00.HHZ.D.2015.015.212213.SAC
          GS.OK030.00.HHZ.D.2015.015.180849.SAC
          GS.OK030.00.HHZ.D.2015.015.213111.SAC GS.OK030.00.HHZ.D.2015.015.000000.SAC

          SAC> MERGE GAP ZERO OVERLAP AVERAGE
          ERROR 108: File does not exist: GAP


          I don't know the syntax to make SAC know that I am providing the options
          rather than the file list, as there is no example on the manual page (
          https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows how
          to control these. Do you have any ideas?

          Best,

          Mitch


          On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com> wrote:

          Hi Mitch,
          Based on the manual, you have to instruct what SAC should do when you
          have gaps or overlapping time series.

          e.g.
          READ file1 file2
          MERGE GAP ZERO OVERLAP COMPARE

          Note that in place of ZERO you can use INTERP and in place of COMPARE
          you can use AVERAGE. It's a decision you will have to make. In your case,
          using AVERAGE might be better, although the decision should be based on the
          data you have.

          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, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca>
          wrote:


          Mitchell Liddell <liddell<at>ualberta.ca>
          10:33 PM (1 minute ago)
          to sac-help

          Hello,

          I am attempting to merge several sac files into single day segments. My
          commands are working if there is a gap in the data (fills in with 0s) but
          if there is an overlap I get, for example, this error:

          SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
          SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

          ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC
          GS.OK030.00.HHZ.D.2015.327.062124.SAC
          END1: 2015 327 6 24 50 580
          BEG2: 2015 327 6 21 24 890

          On the manual page for MERGE (
          ds.iris.edu/files/sac-manual/commands/merge.html) there is an option
          to make data overlaps average.

          I could not find the syntax for applying the options for data gaps or
          overlaps in MERGE. Can you help me with this?

          Thank you!

          Mitch

          --
          Mitch V. Liddell, PhD
          Postdoctoral Researcher
          University of Alberta
          587-372-5060

          ----------------------
          SAC Help
          Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
          Unsubscribe: sac-help-unsubscribe<at>lists.ds.iris.edu

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


          ----------------------
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          Topic home: http://ds.iris.edu/message-center/topic/sac-help/ |
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          --
          Mitch V. Liddell, PhD
          Postdoctoral Researcher
          University of Alberta
          587-372-5060


          ----------------------
          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/)
          Update subscription preferences at http://ds.iris.edu/account/profile/



          --
          Mitch V. Liddell, PhD
          Postdoctoral Researcher
          University of Alberta
          587-372-5060

          • Cliff Thurber
            2019-01-10 21:20:06
            What computer platform are you using? Apparently MERGE does not work right on Macs. If you search the web you can find lots of links about MERGE problems.

            Cliff Thurber

            On Jan 10, 2019, at 3:01 AM, Mitchell Liddell <liddell<at>ualberta.ca<liddell<at>ualberta.ca>> wrote:

            Hello Januka,

            I don't think the way that I'm reading in the files is the issue. I have tried reading in all the files at one time and then attempting merge, and also merging one by one like:

            r file1
            merge file2
            merge file3
            .
            .
            .
            write merged.sac

            This works as long as there are no overlaps because I can't find out how to use the option in the merge command.

            Does that make sense?

            Thanks!

            Mitch

            On Wed, Jan 9, 2019 at 10:54 PM Geo . <jattanayake<at>gmail.com<jattanayake<at>gmail.com>> wrote:
            Try
            READ *GS.OK030.00.HHZ.D.2015.015*.SAC

            Januka

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

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

            [https://docs.google.com/uc?export=download&id=18UprUc6tr2T7pShyWEVxhJNmiEGEFySy&revid=0B2dyBa1wSDlRV3Z5a1Z4UEl5WHhHaExLc1M4S0s1blFLc3RrPQ]



            On Thu, 10 Jan 2019 at 15:16, Mitchell Liddell <liddell<at>ualberta.ca<liddell<at>ualberta.ca>> wrote:
            Hello Januka,

            Thank you very much for the response. Unfortunately, if I run commands in that way I get an error because SAC thinks I'm trying to merge the file "GAP" to "ZERO" etc:

            SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
            GS.OK030.00.HHZ.D.2015.015.181259.SAC GS.OK030.00.HHZ.D.2015.015.212306.SAC GS.OK030.00.HHZ.D.2015.015.212213.SAC
            GS.OK030.00.HHZ.D.2015.015.180849.SAC GS.OK030.00.HHZ.D.2015.015.213111.SAC GS.OK030.00.HHZ.D.2015.015.000000.SAC

            SAC> MERGE GAP ZERO OVERLAP AVERAGE
            ERROR 108: File does not exist: GAP


            I don't know the syntax to make SAC know that I am providing the options rather than the file list, as there is no example on the manual page (https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows how to control these. Do you have any ideas?

            Best,

            Mitch


            On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com<jattanayake<at>gmail.com>> wrote:
            Hi Mitch,
            Based on the manual, you have to instruct what SAC should do when you have gaps or overlapping time series.

            e.g.
            READ file1 file2
            MERGE GAP ZERO OVERLAP COMPARE

            Note that in place of ZERO you can use INTERP and in place of COMPARE you can use AVERAGE. It's a decision you will have to make. In your case, using AVERAGE might be better, although the decision should be based on the data you have.

            Januka

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

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

            [https://docs.google.com/uc?export=download&id=18UprUc6tr2T7pShyWEVxhJNmiEGEFySy&revid=0B2dyBa1wSDlRV3Z5a1Z4UEl5WHhHaExLc1M4S0s1blFLc3RrPQ]



            On Thu, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca<liddell<at>ualberta.ca>> wrote:

            Mitchell Liddell <liddell<at>ualberta.ca<liddell<at>ualberta.ca>>
            10:33 PM (1 minute ago)
            to sac-help

            Hello,

            I am attempting to merge several sac files into single day segments. My commands are working if there is a gap in the data (fills in with 0s) but if there is an overlap I get, for example, this error:

            SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
            SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

            ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC GS.OK030.00.HHZ.D.2015.327.062124.SAC
            END1: 2015 327 6 24 50 580
            BEG2: 2015 327 6 21 24 890

            On the manual page for MERGE (ds.iris.edu/files/sac-manual/commands/merge.htmlhttp://ds.iris.edu/files/sac-manual/commands/merge.html) there is an option to make data overlaps average.

            I could not find the syntax for applying the options for data gaps or overlaps in MERGE. Can you help me with this?

            Thank you!

            Mitch

            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
            SAC Help
            Topic home: http://ds.iris.edu/message-center/topic/sac-help/ | Unsubscribe: sac-help-unsubscribe<at>lists.ds.iris.edu<sac-help-unsubscribe<at>lists.ds.iris.edu>

            Sent from the IRIS Message Center (http://ds.iris.edu/message-center/)
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            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
            SAC Help
            Topic home: http://ds.iris.edu/message-center/topic/sac-help/ | Unsubscribe: sac-help-unsubscribe<at>lists.ds.iris.edu<sac-help-unsubscribe<at>lists.ds.iris.edu>

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            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
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            • Hello,

              I downloaded 10 days continuous waveform data in seed format from BREQ_FAST
              Request. And try to convert it into SAC format. I applied rdseed -df
              (seed file name) command and got the following error. However, for
              one-day data,
              I had no error. In this regards, Could you please give me some suggestions?

              Thank you in advance!

              My error is:

              Writing XQ.NA010..HH2, 19999039 samples (binary), starting 2015,229
              03:46:38.6700 UT

              WARNING (process_data): too much data (burp!).

              Maximum data length exceeded for station NA010, channel HH2.

              Due to indigestion, this seismogram will be split into sections.

              Try increasing the Sample Buffer Length

              Writing XQ.NA010..HH2, 19998908 samples (binary), starting 2015,230
              07:33:13.8650 UT

              WARNING (process_data): too much data (burp!).

              Maximum data length exceeded for station NA010, channel HH2.

              Due to indigestion, this seismogram will be split into sections.

              Try increasing the Sample Buffer Length

              Sanjev Dhakal

              On Fri, Jan 11, 2019 at 1:30 AM Cliff Thurber <cthurber<at>wisc.edu> wrote:

              What computer platform are you using? Apparently MERGE does not work
              right on Macs. If you search the web you can find lots of links about
              MERGE problems.

              Cliff Thurber

              On Jan 10, 2019, at 3:01 AM, Mitchell Liddell <liddell<at>ualberta.ca> wrote:

              Hello Januka,

              I don't think the way that I'm reading in the files is the issue. I have
              tried reading in all the files at one time and then attempting merge, and
              also merging one by one like:

              r file1
              merge file2
              merge file3
              .
              .
              .
              write merged.sac

              This works as long as there are no overlaps because I can't find out how
              to use the option in the merge command.

              Does that make sense?

              Thanks!

              Mitch

              On Wed, Jan 9, 2019 at 10:54 PM Geo . <jattanayake<at>gmail.com> wrote:

              Try
              READ *GS.OK030.00.HHZ.D.2015.015*.SAC

              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, 10 Jan 2019 at 15:16, Mitchell Liddell <liddell<at>ualberta.ca>
              wrote:

              Hello Januka,

              Thank you very much for the response. Unfortunately, if I run commands
              in that way I get an error because SAC thinks I'm trying to merge the file
              "GAP" to "ZERO" etc:

              SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
              GS.OK030.00.HHZ.D.2015.015.181259.SAC
              GS.OK030.00.HHZ.D.2015.015.212306.SAC GS.OK030.00.HHZ.D.2015.015.212213.SAC
              GS.OK030.00.HHZ.D.2015.015.180849.SAC
              GS.OK030.00.HHZ.D.2015.015.213111.SAC GS.OK030.00.HHZ.D.2015.015.000000.SAC

              SAC> MERGE GAP ZERO OVERLAP AVERAGE
              ERROR 108: File does not exist: GAP


              I don't know the syntax to make SAC know that I am providing the options
              rather than the file list, as there is no example on the manual page (
              https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows
              how to control these. Do you have any ideas?

              Best,

              Mitch


              On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com> wrote:

              Hi Mitch,
              Based on the manual, you have to instruct what SAC should do when you
              have gaps or overlapping time series.

              e.g.
              READ file1 file2
              MERGE GAP ZERO OVERLAP COMPARE

              Note that in place of ZERO you can use INTERP and in place of COMPARE
              you can use AVERAGE. It's a decision you will have to make. In your case,
              using AVERAGE might be better, although the decision should be based on the
              data you have.

              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, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca>
              wrote:


              Mitchell Liddell <liddell<at>ualberta.ca>
              10:33 PM (1 minute ago)
              to sac-help

              Hello,

              I am attempting to merge several sac files into single day segments.
              My commands are working if there is a gap in the data (fills in with 0s)
              but if there is an overlap I get, for example, this error:

              SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
              SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

              ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC
              GS.OK030.00.HHZ.D.2015.327.062124.SAC
              END1: 2015 327 6 24 50 580
              BEG2: 2015 327 6 21 24 890

              On the manual page for MERGE (
              ds.iris.edu/files/sac-manual/commands/merge.html) there is an option
              to make data overlaps average.

              I could not find the syntax for applying the options for data gaps or
              overlaps in MERGE. Can you help me with this?

              Thank you!

              Mitch

              --
              Mitch V. Liddell, PhD
              Postdoctoral Researcher
              University of Alberta
              587-372-5060

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              --
              Mitch V. Liddell, PhD
              Postdoctoral Researcher
              University of Alberta
              587-372-5060


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              --
              Mitch V. Liddell, PhD
              Postdoctoral Researcher
              University of Alberta
              587-372-5060


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              --

              Thank you!
              Best Regards

              *------------------------------------------------------------*

              *Sanjev Dhakal*

              Institute of Tibetan Plateau Research, Chinese Academy of Sciences
              (ITP-CAS).

              *Address:* No.16, Lincui Rd., Chaoyang District, Beijing 100101, China

              *Cell:* *+86- <+86%20130%205144%203523>18811333057 (China) and
              +977-9849335053 (Nepal)*

              Alternative E-mail:
              *Sanjev<at>itpcas.ac.cn <Sanjev<at>itpcas.ac.cn>*

          • George Helffrich
            2019-01-11 02:13:39
            Dear All -

            This could be down to a difference between IRIS/SAC and BRIS/SAC. The syntax of the MERGE command changed incompatibly at some point in the evolution of IRIS’ SAC that the BRIS version does not implement.

            Suggest that you handle the overlap by using CUTIM to trim the overlap from the partially merged in-memory merged trace before doing the next merge.

            As Januka says, merging data without knowing why the overlap arises is worrisome.

            On 10 Jan 2019, at 18:00, Mitchell Liddell <liddell<at>ualberta.ca> wrote:

            Hello Januka,

            I don't think the way that I'm reading in the files is the issue. I have tried reading in all the files at one time and then attempting merge, and also merging one by one like:

            r file1
            merge file2
            merge file3
            .
            .
            .
            write merged.sac

            This works as long as there are no overlaps because I can't find out how to use the option in the merge command.

            Does that make sense?

            Thanks!

            Mitch

            On Wed, Jan 9, 2019 at 10:54 PM Geo . <jattanayake<at>gmail.com> wrote:
            Try
            READ *GS.OK030.00.HHZ.D.2015.015*.SAC

            Januka

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

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





            On Thu, 10 Jan 2019 at 15:16, Mitchell Liddell <liddell<at>ualberta.ca> wrote:
            Hello Januka,

            Thank you very much for the response. Unfortunately, if I run commands in that way I get an error because SAC thinks I'm trying to merge the file "GAP" to "ZERO" etc:

            SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
            GS.OK030.00.HHZ.D.2015.015.181259.SAC GS.OK030.00.HHZ.D.2015.015.212306.SAC GS.OK030.00.HHZ.D.2015.015.212213.SAC
            GS.OK030.00.HHZ.D.2015.015.180849.SAC GS.OK030.00.HHZ.D.2015.015.213111.SAC GS.OK030.00.HHZ.D.2015.015.000000.SAC

            SAC> MERGE GAP ZERO OVERLAP AVERAGE
            ERROR 108: File does not exist: GAP


            I don't know the syntax to make SAC know that I am providing the options rather than the file list, as there is no example on the manual page (https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows how to control these. Do you have any ideas?

            Best,

            Mitch


            On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com> wrote:
            Hi Mitch,
            Based on the manual, you have to instruct what SAC should do when you have gaps or overlapping time series.

            e.g.
            READ file1 file2
            MERGE GAP ZERO OVERLAP COMPARE

            Note that in place of ZERO you can use INTERP and in place of COMPARE you can use AVERAGE. It's a decision you will have to make. In your case, using AVERAGE might be better, although the decision should be based on the data you have.

            Januka

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

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





            On Thu, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca> wrote:

            Mitchell Liddell <liddell<at>ualberta.ca>
            10:33 PM (1 minute ago)
            to sac-help

            Hello,

            I am attempting to merge several sac files into single day segments. My commands are working if there is a gap in the data (fills in with 0s) but if there is an overlap I get, for example, this error:

            SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
            SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

            ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC GS.OK030.00.HHZ.D.2015.327.062124.SAC
            END1: 2015 327 6 24 50 580
            BEG2: 2015 327 6 21 24 890

            On the manual page for MERGE (ds.iris.edu/files/sac-manual/commands/merge.html) there is an option to make data overlaps average.

            I could not find the syntax for applying the options for data gaps or overlaps in MERGE. Can you help me with this?

            Thank you!

            Mitch

            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
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            Topic home: http://ds.iris.edu/message-center/topic/sac-help/ | Unsubscribe: sac-help-unsubscribe<at>lists.ds.iris.edu

            Sent from the IRIS Message Center (http://ds.iris.edu/message-center/)
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            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
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            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
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            George Helffrich
            george<at>elsi.jp


          • Brian Savage
            2019-01-14 17:47:58
            Mitchell,

            Did you find a solution to your problem?

            As George Helffrich suggests the problem may be differences between IRIS/SAC and BRIS/SAC, or possibly an older version of IRIS/SAC. Which version are you running? The copyright shown when sac starts should identify it rather easily.

            Januka’s suggestion is based on v101.6a of IRIS/SAC.

            Brian

            On Jan 10, 2019, at 4:00 AM, Mitchell Liddell <liddell<at>ualberta.ca> wrote:

            Hello Januka,

            I don't think the way that I'm reading in the files is the issue. I have tried reading in all the files at one time and then attempting merge, and also merging one by one like:

            r file1
            merge file2
            merge file3
            .
            .
            .
            write merged.sac

            This works as long as there are no overlaps because I can't find out how to use the option in the merge command.

            Does that make sense?

            Thanks!

            Mitch

            On Wed, Jan 9, 2019 at 10:54 PM Geo . <jattanayake<at>gmail.com <jattanayake<at>gmail.com>> wrote:
            Try
            READ *GS.OK030.00.HHZ.D.2015.015*.SAC

            Januka

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

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





            On Thu, 10 Jan 2019 at 15:16, Mitchell Liddell <liddell<at>ualberta.ca <liddell<at>ualberta.ca>> wrote:
            Hello Januka,

            Thank you very much for the response. Unfortunately, if I run commands in that way I get an error because SAC thinks I'm trying to merge the file "GAP" to "ZERO" etc:

            SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
            GS.OK030.00.HHZ.D.2015.015.181259.SAC GS.OK030.00.HHZ.D.2015.015.212306.SAC GS.OK030.00.HHZ.D.2015.015.212213.SAC
            GS.OK030.00.HHZ.D.2015.015.180849.SAC GS.OK030.00.HHZ.D.2015.015.213111.SAC GS.OK030.00.HHZ.D.2015.015.000000.SAC

            SAC> MERGE GAP ZERO OVERLAP AVERAGE
            ERROR 108: File does not exist: GAP


            I don't know the syntax to make SAC know that I am providing the options rather than the file list, as there is no example on the manual page (https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows how to control these. Do you have any ideas?

            Best,

            Mitch


            On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com <jattanayake<at>gmail.com>> wrote:
            Hi Mitch,
            Based on the manual, you have to instruct what SAC should do when you have gaps or overlapping time series.

            e.g.
            READ file1 file2
            MERGE GAP ZERO OVERLAP COMPARE

            Note that in place of ZERO you can use INTERP and in place of COMPARE you can use AVERAGE. It's a decision you will have to make. In your case, using AVERAGE might be better, although the decision should be based on the data you have.

            Januka

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

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





            On Thu, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca <liddell<at>ualberta.ca>> wrote:

            Mitchell Liddell <liddell<at>ualberta.ca <liddell<at>ualberta.ca>>
            10:33 PM (1 minute ago)
            to sac-help

            Hello,

            I am attempting to merge several sac files into single day segments. My commands are working if there is a gap in the data (fills in with 0s) but if there is an overlap I get, for example, this error:

            SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
            SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

            ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC GS.OK030.00.HHZ.D.2015.327.062124.SAC
            END1: 2015 327 6 24 50 580
            BEG2: 2015 327 6 21 24 890

            On the manual page for MERGE (ds.iris.edu/files/sac-manual/commands/merge.html http://ds.iris.edu/files/sac-manual/commands/merge.html) there is an option to make data overlaps average.

            I could not find the syntax for applying the options for data gaps or overlaps in MERGE. Can you help me with this?

            Thank you!

            Mitch

            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
            SAC Help
            Topic home: http://ds.iris.edu/message-center/topic/sac-help/ | Unsubscribe: sac-help-unsubscribe<at>lists.ds.iris.edu <sac-help-unsubscribe<at>lists.ds.iris.edu>

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

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            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
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            Topic home: http://ds.iris.edu/message-center/topic/sac-help/ | Unsubscribe: sac-help-unsubscribe<at>lists.ds.iris.edu <sac-help-unsubscribe<at>lists.ds.iris.edu>

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            --
            Mitch V. Liddell, PhD
            Postdoctoral Researcher
            University of Alberta
            587-372-5060

            ----------------------
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            • Mitchell Liddell
              2019-01-14 19:34:12
              Hello Brian,

              I suspect the issue has to do with the IRIS/SAC vs BRIS/SAC differences as
              George Hellfrich proposed. In my case, I had very situations that required
              an overlap so it was just easier to trim them instead of working out a
              solution to the overlap itself.

              The data gap filling function of merge has been fine, although I haven't
              been able to find the syntax to change the command from fill with 0s to
              interpolate.

              Mitch

              On Mon, Jan 14, 2019 at 7:48 AM Brian Savage <savage<at>uri.edu> wrote:

              Mitchell,

              Did you find a solution to your problem?

              As George Helffrich suggests the problem may be differences between
              IRIS/SAC and BRIS/SAC, or possibly an older version of IRIS/SAC. Which
              version are you running? The copyright shown when sac starts should
              identify it rather easily.

              Januka’s suggestion is based on v101.6a of IRIS/SAC.

              Brian

              On Jan 10, 2019, at 4:00 AM, Mitchell Liddell <liddell<at>ualberta.ca> wrote:

              Hello Januka,

              I don't think the way that I'm reading in the files is the issue. I have
              tried reading in all the files at one time and then attempting merge, and
              also merging one by one like:

              r file1
              merge file2
              merge file3
              .
              .
              .
              write merged.sac

              This works as long as there are no overlaps because I can't find out how
              to use the option in the merge command.

              Does that make sense?

              Thanks!

              Mitch

              On Wed, Jan 9, 2019 at 10:54 PM Geo . <jattanayake<at>gmail.com> wrote:

              Try
              READ *GS.OK030.00.HHZ.D.2015.015*.SAC

              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, 10 Jan 2019 at 15:16, Mitchell Liddell <liddell<at>ualberta.ca>
              wrote:

              Hello Januka,

              Thank you very much for the response. Unfortunately, if I run commands
              in that way I get an error because SAC thinks I'm trying to merge the file
              "GAP" to "ZERO" etc:

              SAC> READ GS.OK030.00.HHZ.D.2015.015*SAC
              GS.OK030.00.HHZ.D.2015.015.181259.SAC
              GS.OK030.00.HHZ.D.2015.015.212306.SAC GS.OK030.00.HHZ.D.2015.015.212213.SAC
              GS.OK030.00.HHZ.D.2015.015.180849.SAC
              GS.OK030.00.HHZ.D.2015.015.213111.SAC GS.OK030.00.HHZ.D.2015.015.000000.SAC

              SAC> MERGE GAP ZERO OVERLAP AVERAGE
              ERROR 108: File does not exist: GAP


              I don't know the syntax to make SAC know that I am providing the options
              rather than the file list, as there is no example on the manual page (
              https://ds.iris.edu/files/sac-manual/commands/merge.html) that shows
              how to control these. Do you have any ideas?

              Best,

              Mitch


              On Wed, Jan 9, 2019 at 3:27 PM Geo . <jattanayake<at>gmail.com> wrote:

              Hi Mitch,
              Based on the manual, you have to instruct what SAC should do when you
              have gaps or overlapping time series.

              e.g.
              READ file1 file2
              MERGE GAP ZERO OVERLAP COMPARE

              Note that in place of ZERO you can use INTERP and in place of COMPARE
              you can use AVERAGE. It's a decision you will have to make. In your case,
              using AVERAGE might be better, although the decision should be based on the
              data you have.

              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, 10 Jan 2019 at 04:12, Mitchell Liddell <liddell<at>ualberta.ca>
              wrote:


              Mitchell Liddell <liddell<at>ualberta.ca>
              10:33 PM (1 minute ago)
              to sac-help

              Hello,

              I am attempting to merge several sac files into single day segments.
              My commands are working if there is a gap in the data (fills in with 0s)
              but if there is an overlap I get, for example, this error:

              SAC> r GS.OK030.00.HHZ.D.2015.327.000000.SAC
              SAC> merge GS.OK030.00.HHZ.D.2015.327.062124.SAC

              ERROR 1802: Time overlap: GS.OK030.00.HHZ.D.2015.327.000000.SAC
              GS.OK030.00.HHZ.D.2015.327.062124.SAC
              END1: 2015 327 6 24 50 580
              BEG2: 2015 327 6 21 24 890

              On the manual page for MERGE (
              ds.iris.edu/files/sac-manual/commands/merge.html) there is an option
              to make data overlaps average.

              I could not find the syntax for applying the options for data gaps or
              overlaps in MERGE. Can you help me with this?

              Thank you!

              Mitch

              --
              Mitch V. Liddell, PhD
              Postdoctoral Researcher
              University of Alberta
              587-372-5060

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              --
              Mitch V. Liddell, PhD
              Postdoctoral Researcher
              University of Alberta
              587-372-5060


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              --
              Mitch V. Liddell, PhD
              Postdoctoral Researcher
              University of Alberta
              587-372-5060

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              --
              Mitch V. Liddell, PhD
              Postdoctoral Researcher
              University of Alberta
              587-372-5060

22:59:59 v.ad6b513c