SAC Help

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

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January (14)

Active Message Threads for January 2020

nagarajugeo@gmail.com
2020-01-23 11:30:29 - 2020-01-24 09:48:42
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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Anupam Patel
2020-01-13 21:32:29 - 2020-01-14 09:37:09
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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Waddah Mahmoud
2020-01-08 19:17:27 - 2020-01-11 19:29:29
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 nu... [more]
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Avinash
2020-01-09 18:38:06 - 2020-01-10 18:21:17
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 frequenc... [more]
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Arthur Snoke
2020-01-09 13:06:49
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 c... [more]
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Baumgardt.Doug
2014-05-06 17:27:27 - 2020-01-09 12:10:35
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 ... [more]
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