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Active Message Threads for September 2016
George Helffrich
Dear All -
I maintain that the COSINE taper is calculated correctly (specifically, by using the sin() function). For justification of this assertion, please refer to the paper,
Harris, F. J. (1978). On the use of windows for harmonic analysis with the discrete Fourier transform. Proc. IEEE 66(1), 51-83.
It deals explicily with the cosine taper, and presents the time-domain coefficients w(n) (n.b. not W(n)) for it. They are calculated through the sin() function, the reason for sin() being…
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Replies
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Re: cosine taper - Peter Schmidt - 2016-09-26 17:14:51
Peter Schmidt
Hi All
Just a small note that perhaps would be reasonable to edit in the SAC manual
According to manual (V101.6a, November 21, 2013) "TAPER TYPE COSINE
WIDTH v" will apply a symmetric taper on format: 1-COS(...) to each end
of the data. However after getting some inconsistent results I had a
look in the source code and found out that the applied taper is really:
ABS(SIN(...)). Perhaps a future edit of the manual could properly state
this.
regP
--
************************************…
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Replies
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Re: cosine taper - Brian Savage - 2016-09-23 18:24:40
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Re: cosine taper - Peter Schmidt - 2016-09-24 01:59:07
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Re: cosine taper - Peter Schmidt - 2016-09-24 02:00:24
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Re: cosine taper - Arthur Snoke - 2016-09-23 21:03:45
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Re: cosine taper - George Helffrich - 2016-09-24 04:57:30
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Re: cosine taper - Arthur Snoke - 2016-09-23 18:17:00
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Re: cosine taper - Arthur Snoke - 2016-09-23 18:48:04
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Hi all
I'm hoping that someone can shed some light upon the the usage of the
nerr parameter in the rsac...() function
Reading the SAC manual, section :"SAC Reading and Writing Routines", I
got the impression that this parameter could be used to check the
success/failure to read a file (0 - success, else failure), yet when I
try to read a non-valid SAC file (i.e. which should fail) nerr is 0 upon
return, which later in my code causes an annoying segmentation fault as
I have no other way …
[more]
No replies
Geo .
Hi,
I have the following macro embedded in a shell script, and when I run the
shell script, SAC does not "see" the PAUSE command and the lines below it,
i.e macro is not paused and QUIT is not executed. I have a feeling that
this is a bug. Am I correct? I am using SAC 101.6
sac<<END
R $sacfile
R MORE $synfile
COLOR ON INC L BLUE RED
P2
PAUSE PERIOD OFF
QUIT
END
ERROR MESSAGE:
SAC Error: EOF/Quit
SAC executed from a script: quit command missing
Please add a quit to the script to avoi…
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Re: SAC in a shell script with PAUSE - Milton Plasencia - 2016-09-22 19:07:34
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Re: SAC in a shell script with PAUSE - Geo . - 2016-09-22 19:13:20
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Re: SAC in a shell script with PAUSE - Milton Plasencia - 2016-09-22 19:24:16
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Re: SAC in a shell script with PAUSE - Brian Savage - 2016-09-22 16:25:38
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reza
Hi,
I want to use root mean square envelope by ENVELOPE command. I could not
find any description about RMS. Anyone can help me please?
Reza
Replies
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Re: RMS envelope - Milton Plasencia - 2016-09-22 03:17:14
Roberto Cabieces Diaz
Hello,
Now I'm developing a program in matlab to deal with deconvolution, I mean
to remove the response of the instrument usin the file sac poles&zeros.
By using GISMO, I bring the data to matlab but I would like to know if
there would be the posibility to acces to the code of sac that make the
deconvolution and translate to matlab.
Thank your for your help Master
No replies
James Neely
Hi,
I'm running into a problem with nested variables in an IF statement. I want to check the sampling rate of the many SAC files and then perform an action based on whether that rate is above or below a reference value. I'm trying to use a DO loop to cycle through the files. However, when I call the macro variable $i inside the header variable, I get an error that it $i is an illegal file name. It looks like SAC is not reading the macro variable correctly. Any ideas on how I can get it to read…
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Replies
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Re: Nested Variables in IF statement - Milton Plasencia - 2016-09-21 12:19:20
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Re: Nested Variables in IF statement - James Neely - 2016-09-21 16:31:07
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Re: Nested Variables in IF statement - George Helffrich - 2016-09-21 18:03:23
kejie
To whom it may concern:
I just downloaded SAC and SACPZ file from IRIS Wilber. What I want is ground motion velocity during earthquake times, So I run the following:
r sacfilename
rmean
taper
transfer from polezero subtype PZfile to vel freqlimits 0.001 0.002 40 50
My question is:
Is the result unit m/s?
How should I determine the freqlimits? In the further step, I am also going to do a band passing for the velocity time series.
All the best!
Kejie
Replies
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Re: remove instrument response - Milton Plasencia - 2016-09-14 13:35:15
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Re: remove instrument response - Arthur Snoke - 2016-09-14 15:34:12
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