[SAC-HELP] Re: sac-help Digest, Vol 33, Issue 4
Tuna Eken
Tuna.Eken at geo.uu.se
Sat Mar 8 14:03:38 PST 2008
To message 3:
Hi Onur,
when I tried the same commands with the same parameters onto my example sac
file
it did worked out ... It actually gave the same error messae when i used
different time values (whis is not included by the data) ...
So problem may be caused by applying wrong values for your data. have you ever
checked starting end ending points of the data ?
regards
tuna eken
Message: 3
Date: Sat, 8 Mar 2008 13:29:51 +0200
From: "Onur Tan" <Onur.Tan at mam.gov.tr>
Subject: [SAC-HELP] Blackboard Variables and CUT
To: <sac-help at iris.washington.edu>
Message-ID:
<110C3E0C4E9ADB4C882229C2A7A1540A052C2511 at POSTA2K3.mam.gov.tr>
Content-Type: text/plain; charset="us-ascii"
Hi,
When I use a blackboard variable as the first parameter of the cut
command in SAC new version (101.0),
it gives error.
I tried this (echo on):
--------------------
SAC> setbb a 600
setbb a 600
SAC> setbb b 700
setbb b 700
SAC> cut %a %b
cut %a %b
==> cut 600
SAC> r
r
WARNING: Start cut greater than stop cut for file 08010_0707_CEV.1
ERROR 1301: No data files read in.
SAC>
-----------------------------
the cut command do not understand the second variable.
This does also not work:
----
SAC> cut %a 700
cut %a 700
==> cut 600
SAC> r
r
WARNING: Start cut greater than stop cut for file 08010_0707_CEV.1
ERROR 1301: No data files read in.
----
But this works
----
SAC> cut 500 %b
cut 500 %b
==> cut 500 700
SAC> r
r
SAC> p
p
----
Do you have any idea?
best regards
Onur Tan
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> Today's Topics:
>
> 1. Two SAC queries - (i) conversion of SAC files to PITSA-ASCII
> and (ii) SAC library issues for multi-channel cross-correlation
> (Fiona Darbyshire)
> 2. About fft routine in SAC (wwxu)
> 3. Blackboard Variables and CUT (Onur Tan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 7 Mar 2008 18:13:09 -0500
> From: "Fiona Darbyshire" <f.darbyshire at gmail.com>
> Subject: [SAC-HELP] Two SAC queries - (i) conversion of SAC files to
> PITSA-ASCII and (ii) SAC library issues for multi-channel
> cross-correlation
> To: sac-help at iris.washington.edu
> Message-ID:
> <256ff3740803071513m5ef1bc36nbfdb2c6317b6d87c at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello,
>
> I have 2 SAC-related queries that are causing me problems on a couple of
> fairly urgent projects currently:
>
> i) I inherited a Matlab program for surface wave analysis. The seismogram
> files that it reads are in PITSA ASCII format. Is there any existing
> software to convert standard SAC to PITSA ASCII? Or will I have to convert
> SAC binary to alpha, and try to reformat the resulting ascii files?
>
> ii) Another inheritance: this time I have been given the source code
> (fortran) for John VanDecar's "mccc" multi-channel cross-correlation
> program. The program contains a lot of SAC functions, such as "rsach",
> "getnhv", "rsac1", "getkhv", "getfhv", "setfhv", "setkhv", "wsac0"... (and
> probably a few others I haven't spotted yet). Along with the Fortran codes I
> was given a couple of SAC libraries of the type "libsac.a". The problem is
> that this set worked OK for a SUN system, but I am on Linux (CentOS 5). With
> the SAC library that I was given, and the SAC library I obtained when
> downloading SAC executables for my current system, I was unable to compile
> the code. I have a really old SAC library (old enough that I can't remember
> even which version it comes from) and that one allowed mccc to compile...
> but not to run (segmentation fault). Can anyone advise me on using SAC
> libraries correctly and/or making changes to the fortran code that will
> allow me to run this program?
>
> I should add that I'm a rather poor programmer - just about literate in
> Fortran, okay in simple shell scripts, but not too great with any other
> programming languages! Any advice greatly appreciated.
>
> Thanks a lot,
>
> Fiona Darbyshire.
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> ------------------------------
>
> Message: 2
> Date: Sat, 08 Mar 2008 02:59:07 GMT
> From: "wwxu" <wwxu at mail.iggcas.ac.cn>
> Subject: [SAC-HELP] About fft routine in SAC
> To: sac-help at iris.washington.edu
> Message-ID: <20080308025907.3888.eqmail at mail.iggcas.ac.cn>
> Content-Type: text/plain; format=flowed; charset="gb2312"
>
> Hi ALL,
>
> In SAC, I generate a 5Hz sine wave and do fft transforming as follows:
> sac> funcgen sine 5 npts 1024 delta 0.01
> sac> fft
> sac> psp am loglin
> and I find that the maximum absolute amplitude is greater than 4 near
> frequency 5Hz, but in theory, it should be 0.5 because of amplitude
> spectrum symmetry of real series, so could you tell me why?
>
> B.T.W., I also compute the amplitude spectrum using fft program I wrote and
> find that the result is not the same with SAC generated, I checked the
> program carefully and be sure that it's right and conform with the
> theoretical result.
>
> thanks for your attention!
>
>
> Your sincerely,
> Xu W.
>
> ************************************************
> Dr. WeiWei Xu
> Institute of Geology and Geophysics
> Chinese Academy of Sciences
> P.O.Box 9825
> Beijing 100029
> China
> Tel: 0086-10-62007354(Office)
> Fax: 0086-10-62010846
> ************************************************
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 8 Mar 2008 13:29:51 +0200
> From: "Onur Tan" <Onur.Tan at mam.gov.tr>
> Subject: [SAC-HELP] Blackboard Variables and CUT
> To: <sac-help at iris.washington.edu>
> Message-ID:
> <110C3E0C4E9ADB4C882229C2A7A1540A052C2511 at POSTA2K3.mam.gov.tr>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Hi,
>
> When I use a blackboard variable as the first parameter of the cut
> command in SAC new version (101.0),
> it gives error.
>
> I tried this (echo on):
> --------------------
> SAC> setbb a 600
> setbb a 600
> SAC> setbb b 700
> setbb b 700
> SAC> cut %a %b
> cut %a %b
> ==> cut 600
> SAC> r
> r
> WARNING: Start cut greater than stop cut for file 08010_0707_CEV.1
> ERROR 1301: No data files read in.
> SAC>
> -----------------------------
> the cut command do not understand the second variable.
>
>
> This does also not work:
> ----
> SAC> cut %a 700
> cut %a 700
> ==> cut 600
> SAC> r
> r
> WARNING: Start cut greater than stop cut for file 08010_0707_CEV.1
> ERROR 1301: No data files read in.
> ----
>
>
> But this works
> ----
> SAC> cut 500 %b
> cut 500 %b
> ==> cut 500 700
> SAC> r
> r
> SAC> p
> p
> ----
>
>
> Do you have any idea?
>
> best regards
> Onur Tan
>
>
>
>
> ------------------------------
>
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> sac-help mailing list
> sac-help at iris.washington.edu
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>
> End of sac-help Digest, Vol 33, Issue 4
> ***************************************
>
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