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Active Message Threads for April 2021
Alessio Lodato
Dear,
i need to filter a signal derived from a seismometer (output in
displacement) from the transfer function of the instrument.
What is the procedure to be followed in SAC?
Thank you in advance.
Regards,
AL
Replies
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Re: Question on filtering signal - Milton Plasencia - 2021-05-11 21:41:59
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Re: Question on filtering signal - Peter Schmidt - 2021-05-11 21:54:46
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R: Question on filtering signal - Alessio Lodato - 2021-05-12 13:59:21
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Re: Question on filtering signal - Milton Plasencia - 2021-05-12 17:09:53
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Re: Question on filtering signal - Milton Plasencia - 2021-05-12 19:55:37
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R: Question on filtering signal - Alessio Lodato - 2021-05-12 20:21:13
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Re: Question on filtering signal - Brian Savage - 2021-05-12 17:26:31
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k.rebeche@craag.dz
hello;
i'am a seismology PhD student.
Currently i'm working on how to evaluate the local magnitude of my region,
but i found some difficulties to determinate the synthetic wood-andersson
seismograme .
my questions are:
when i use the commande transfer from polezero subtype fname to WA, do i
have to deconvoluate the instrument response or i use the raw signal
directly ?
and do i get the synthetic wood-anderson signal ? also, what is the unit
of the amplitude of Wood-Anderson signal ?
can you pro…
[more]
Replies
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Re: Wood-Anderson synthetic signal - Milton Plasencia - 2021-04-22 22:43:37
Félix Rodrigo Rodríguez Cardozo
Dear all,
One seismogram I am working with has the baseline shifted (down figure1). I
tried to fix it as usual: rmean; trend. However, the axis amplitude
remained exaggerated in comparison to the maximum amplitude. Then I thought
to change the header values DEPMEN, DEPMAX and, DEPMIN (figure 2).
Unfortunately, the problem continues (up figure1).
Any suggestions will be highly appreciated.
Thank you,
Félix
No replies
massa@unisannio.it
Dear All,
I am using the last SAC version on OSX 10.11.6 and I am running into some problems. Following I report a synthesis.
Using ppk perplot … markall on and ohpf:
If I pick P and S waves I can see, in the graphic window (Xquartz), only information about P waves. Moreover, if I write “ohpf NAME.txt” and then “chpf” the .txt file contains only the closing row “10”.
How can I see, in the graphic window , also info about S waves?
How can I write in a text file info about picked wave…
[more]
Replies
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Re: Problem with PPK OHPF and CHPF - Milton Plasencia - 2021-03-30 20:16:38
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Re: Problem with PPK OHPF and CHPF - massa@unisannio.it - 2021-04-01 05:35:32
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Re: Problem with PPK OHPF and CHPF - Arthur Snoke - 2021-04-09 07:16:04
Tony Saini
Dear Sir/mam, there is a problem with KZ time. actually, the year is
written 12 rather than 2012 in origin time. can you help me to change this
year in kz time?
Replies
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Re: KZ time Problem - Milton Plasencia - 2021-04-06 20:38:29
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Re: KZ time Problem - Tony Saini - 2021-04-07 10:51:07
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Guust Nolet
I am trying to correct Mermaid hydrophone seismograms for their instrument response, but encounter a problem with the polezero file.
I am running SEISMIC ANALYSIS CODE [03/05/2020 (Version 102.0)] on a Mac Powerbook. The forward conversion from ’none’ to
the instrument response works fine, but going backwards I get an error message. For example:
SAC> funcgen boxcar delta 0.05 npts 2048
SAC> p
SAC> trans from none to polezero S pzmm
Station (-12345 ), Channel (-12345 )
Using polezero respo…
[more]
Replies
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Re: Sac's transfer command - Brian Savage - 2021-04-06 14:08:27
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Re: Sac's transfer command - Milton Plasencia - 2021-04-06 20:08:05
Sheila Peacock
Dear SAC users,
I have just had my computer upgraded to Fedora-33 from 29, and my locally compiled copy of SAC-102 has lost the ability to do command-line editing (e.g. pressing the up-arrow does not get me back to the previous command).
I had compiled SAC-102 on Fedora-29 and was running it on Fedora-33, so I did "make distclean" and recompiled on Fedora-33, but with no better luck.
The version of "libedit" that comes with Fedora-29 is v. 0.0.56, and with Fedora-33 is 0.0.63, and there is a…
[more]
