SAC Help

A forum for SAC users to exchange ideas and ask questions about SAC usage, installation, portability, etc.

This mailing list has moved to https://groups.google.com/a/earthscope.org/g/sac-community.
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sac-help@lists.ds.iris.edu
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Help

Help lists are for submitting support questions. Anyone can post a question for IRIS (or another team) to answer.

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Active Message Threads for January 2023

Sushrat Mishra
Regarding "Scale" header in SAC (urgent)
2023-01-25 11:02:26 - 2023-01-27 07:13:32
Respected Sir, I have a query regarding the "Scale" header in SAC file.I have searched in SAC manual but haven't got any clue. I am trying to convert the counts (raw unit of seismogram) into some earth units(e.g. acceleration/velocity) ...For this exact factor is required. I have gone through this link of IRIS https://ds.iris.edu/ds/support/faq/6/what-is-a-count-in-timeseries-data/ & found that its written, $SCALE=1m/s. I did the same thing with few earthquake data recorded in "KATNP" station… [more]
Replies
アングライニノビア
Shifting Reference Time
2023-01-18 19:35:04 - 2023-01-26 17:53:03
Good Afternoon My SAC data is in UT and I need to change it to GMT+4. At first, I used the chnhdr+wh command, but it only changed the header, as its name suggests, but when I plotted the data, the X axis started from -14400, 4*3600. Is there any other way to shift the time reference of SAC data, so that when I plot it the data will start from 0 s? I really appreciate any help you can provide
Replies
Jamie Farrell
recording AMARKER information
2023-01-11 20:06:41 - 2023-01-11 20:21:26
I have a bunch picks that are recorded in the sac header as AMARKER and T0. I can use saclst to pull out the pick times but I want to also pull out the metadata such as the phase, weight, etc. (i.e. IUP0). I can’t seem to do this using saclst. Does anyone have a way to pull this information out of the sac header? Thanks, ------------------------------------------ Jamie Farrell Research Assistant Professor Seismograph Stations Dept. of Geology & Geophysics University of Utah 115 S… [more]
Replies
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