Hi!
I am a geophysics master's student in University of Helsinki, Finland. My thesis includes kappa-calculations and I've opted to do this calculations with SAC. So far everything has gone well, I've managed to do the noise- and S-wave spectral plots. Next step would be to apply a best-fit line on part of the S-wave spectra, from which the kappa-parameter could be calculated. I've been unable to find the right commands to do this however and I was wondering if you could provide some technical assistance on how can I plot this line in the S-wave spectra between two points.
Thank you!
Best regards,
Lauri Rinne
I am a geophysics master's student in University of Helsinki, Finland. My thesis includes kappa-calculations and I've opted to do this calculations with SAC. So far everything has gone well, I've managed to do the noise- and S-wave spectral plots. Next step would be to apply a best-fit line on part of the S-wave spectra, from which the kappa-parameter could be calculated. I've been unable to find the right commands to do this however and I was wondering if you could provide some technical assistance on how can I plot this line in the S-wave spectra between two points.
Thank you!
Best regards,
Lauri Rinne
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Hi Lauri. This tutorial might have the answer.
http://www.ceri.memphis.edu/people/rsmalley/ESCI7205F2009/Lecture9.pdf
Good luck.
Cliff Thurber
On Sep 16, 2020, at 3:50 PM, Rinne, Lauri A (via IRIS) <sac-help-9187.97987-bounce<at>lists.ds.iris.edu> wrote:
Hi!
I am a geophysics master's student in University of Helsinki, Finland. My thesis includes kappa-calculations and I've opted to do this calculations with SAC. So far everything has gone well, I've managed to do the noise- and S-wave spectral plots. Next step would be to apply a best-fit line on part of the S-wave spectra, from which the kappa-parameter could be calculated. I've been unable to find the right commands to do this however and I was wondering if you could provide some technical assistance on how can I plot this line in the S-wave spectra between two points.
Thank you!
Best regards,
Lauri Rinne
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Dear Lauri -
There are a couple of ways to do this, with tradeoffs between flexibility and ease of use. They are best used by making your analysis procedure into a SAC macro script and generating the line parameters from your signal analysis results. From the simplest to the most complex approach:
1. FUNCGEN LINE will create a SAC seismogram that is a line; you can use P2 to overlay the line plot on your data.
2. READTABLE will read in an arbitrary curve of X-Y data. Read the X-Y points written out by your analysis as a seismogram and plot them using P2.
3. Annotate your plot using PLOTC. Your analysis procedure creates a SAC macro file that you replay along with your seismogram plot to add points, lines, text, etc. to show the results.
See chapter 7 of the SAC book for a lot of information about how to do this, and chapter 11 for some real examples.
On 16 Sep 2020, at 21:46, Rinne, Lauri A (via IRIS) <sac-help-9187.97987-bounce<at>lists.ds.iris.edu> wrote:
George Helffrich
Hi!
I am a geophysics master's student in University of Helsinki, Finland. My thesis includes kappa-calculations and I've opted to do this calculations with SAC. So far everything has gone well, I've managed to do the noise- and S-wave spectral plots. Next step would be to apply a best-fit line on part of the S-wave spectra, from which the kappa-parameter could be calculated. I've been unable to find the right commands to do this however and I was wondering if you could provide some technical assistance on how can I plot this line in the S-wave spectra between two points.
Thank you!
Best regards,
Lauri Rinne
----------------------
SAC Help
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george<at>elsi.jp