A forum for SAC users to exchange ideas and ask questions about SAC usage, installation, portability, etc.
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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 2020
nagarajugeo@gmail.com
Dear All,
I would like to calculate the noise spectrum of seismic waveform (waveform length of 5 s : 2.5 s pre- and post- of P-phase). I tried it in sac, however, I did not get it. Kindly suggest me the procedure for calculating the noise spectrum.
thanking you
Kanna
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Re: Noise spectrum of seismic waveform - Geo . - 2020-01-24 09:48:42
Anupam Patel
Dear all,
I have converted my miniseed data using mseed2sac software and in the
generated SAC file I unable to change KZTIME nor able to mark any phase
using Taup_p software.
I am attaching one SAC file.
Thank you very much in advance.
regards,
Anupam
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Re: unable to change KZTIME in SAC - Geo . - 2020-01-14 09:37:09
Waddah Mahmoud
Dear all, I am using sac since about 2 months and need help in writing events parameters into sac headers as the following details:
I have more than 400 events as sac files, and a text file containing events parameters" evla, evlo, evdp, mag" . I am trying to find a macro or shell script in any language to read these parameters from file and insert them in sac file's header.
I prepare all sac files with names like " 1.sac, 2.sac, ..." and the same in text file data "line1: contains event numb…
[more]
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Re: write headers from metadata - Mohammad Youssof - 2020-01-09 02:52:24
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Re: write headers from metadata - Mohammad Youssof - 2020-01-09 23:33:03
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Re: write headers from metadata - Waddah Mahmoud - 2020-01-11 19:29:29
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Avinash
Hi SAC users,
I have a somewhat stupid question about integration in SAC.
SAC provides two methods to do integration: time-domain (int) and
frequency-domain (divomega).
"int" uses the trapezoidal method and the first data point in the
integrated time-series is assumed to be zero.
"divomega" uses the Fourier transform properties integral=IFFT[ FFT[ x(t )]
/ i w ], in which w is angular frequency and x(t) is time series. Is this
method making any assumptions ? What happens at the first frequency …
[more]
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Re: question on integration - George Helffrich - 2020-01-10 18:21:17
Arthur Snoke
Nasir,
I am forwarding your message to the sac-help listserv, as there are people on that listserv who are better able to answer your question than I.
Arthur
> Begin forwarded message:
>
> From: nasir mahmood <earthq5@yahoo.com>
> Subject: Dear Sir
> Date: January 9, 2020 at 12:54:23 PM EST
> To: snoke@vt.edu
> Reply-To: earthq5@yahoo.com
>
> Dear Sir
> hope you will be fine and with good health. Understand you are a busy researcher.
>
> There is an earthquake of Mw 6.4. The station clo…
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No replies
Baumgardt.Doug
I have downloaded data in PASSCAL SEGY format, one file per channel. However, when I try to read in one of the files with the command 'read SEGY {filename}, , I receive an error message "ERROR 1340: data points outside allowed range contained in file {file name}". What does this mean and how do I read this data in?
Douglas R. Baumgardt
________________________________
The information contained in this email message is intended only for the use of the individual(s) to whom it is addressed an…
[more]
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Re: SAC Read SEGY - rob@iris.washington.edu - 2014-05-06 15:38:51
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Re: SAC Read SEGY - Brian Savage - 2014-05-06 19:31:02
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Re: SAC Read SEGY - wenai.oc@gmail.com - 2018-03-22 13:31:09
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Re: SAC Read SEGY - Tong Bai - 2020-01-09 06:52:54
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Re: SAC Read SEGY - rob@iris.washington.edu - 2020-01-09 10:51:14
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Re: SAC Read SEGY - Joshua Jones - 2020-01-09 12:10:35
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