Thread: Change origin time and KZTIME

Hi,

If I understand correctly, perhaps the sac command synchronize fits what you want.

To obtain more information do:

SAC> help synchronize

HTH,

Milton

On 24 May 2019, at 18:30, Jesse-Lee Dimech <jdimech<at>gmail.com> wrote:

Hi all,

I work with SAC files for located events with OMARKER set to 0, and so the KZDATE and KZTIME are the origin time parameters, which I extract and use for data processing.

Some of my SAC files have slightly different origin times (located using different numbers of stations), and I want to fix this so it's consistent across all the sac files for a particular event. And so that OMARKER is 0 and KZDATE and KZTIME reflects the absolute origin time.

Any ideas on how to do this?

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Hi Jesse-Lee,
These are derived headers. You have to change the original headers to
change these. See


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 Sat, 25 May 2019 at 02:30, Jesse-Lee Dimech <jdimech<at>gmail.com> wrote:

Hi all,

I work with SAC files for located events with OMARKER set to 0, and so the
KZDATE and KZTIME are the origin time parameters, which I extract and use
for data processing.

Some of my SAC files have slightly different origin times (located using
different numbers of stations), and I want to fix this so it's consistent
across all the sac files for a particular event. And so that OMARKER is 0
and KZDATE and KZTIME reflects the absolute origin time.

Any ideas on how to do this?

----------------------
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/)
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Hi Jesse-Lee,
These are derived headers. You have to change the original headers to
change these. See

KZDATE A Alphanumeric form of GMT reference date. Derived from NZYEAR and
NZJDAY.
KZTIME A Alphanumeric form of GMT reference time. Derived from NZHOUR,
NZMIN, NZSEC, and NZMSEC.

Also to set OMARKER
https://ds.iris.edu/files/sac-manual/commands/chnhdr.html

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 Sat, 25 May 2019 at 02:30, Jesse-Lee Dimech <jdimech<at>gmail.com> wrote:

Hi all,

I work with SAC files for located events with OMARKER set to 0, and so the
KZDATE and KZTIME are the origin time parameters, which I extract and use
for data processing.

Some of my SAC files have slightly different origin times (located using
different numbers of stations), and I want to fix this so it's consistent
across all the sac files for a particular event. And so that OMARKER is 0
and KZDATE and KZTIME reflects the absolute origin time.

Any ideas on how to do this?

----------------------
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/