Thread: RE: Re: sac-help Digest, Vol 33, Issue 4

Started: 2008-03-09 19:15:37
Last activity: 2008-03-09 20:31:55
Topics: SAC Help
Onur Tan
2008-03-09 19:15:37

Hi Tuna,

exactly, my data length is 1800 sec.
if you look the sample again, cutting limits is 600-700 sec.
the problem is the first variable ( %a )
when echo on, the second variable can not writen to the screen !
SAC> cut %a %b
cut %a %b
==> cut 600


Do you use the version 101.0?
I have no problem with old version.

onur


-----Original Message-----
From: sac-help-bounces<at>iris.washington.edu
[sac-help-bounces<at>iris.washington.edu] On Behalf Of Tuna Eken
Sent: Sunday, March 09, 2008 12:04 AM
To: sac-help<at>iris.washington.edu
Subject: [SAC-HELP] Re: sac-help Digest, Vol 33, Issue 4





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




Citerar sac-help-request<at>iris.washington.edu:

Send sac-help mailing list submissions to
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To subscribe or unsubscribe via the World Wide Web, visit
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or, via email, send a message with subject or body 'help' to
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You can reach the person managing the list at
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of sac-help digest..."


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 fft 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




------------------------------

_______________________________________________
sac-help mailing list
sac-help<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/sac-help


End of sac-help Digest, Vol 33, Issue 4
***************************************




_______________________________________________
sac-help mailing list
sac-help<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/sac-help


  • Tuna Eken
    2008-03-09 20:31:55

    Hi Onur,

    I am actually running the version "00.59.46" on a FC7 of my linux enviroment.
    then according to your experience it seems most probably based on the version
    ...

    cheers
    tuna

    Citerar Onur Tan <Onur.Tan<at>mam.gov.tr>:


    Hi Tuna,

    exactly, my data length is 1800 sec.
    if you look the sample again, cutting limits is 600-700 sec.
    the problem is the first variable ( %a )
    when echo on, the second variable can not writen to the screen !
    SAC> cut %a %b
    cut %a %b
    ==> cut 600


    Do you use the version 101.0?
    I have no problem with old version.

    onur


    -----Original Message-----
    From: sac-help-bounces<at>iris.washington.edu
    [sac-help-bounces<at>iris.washington.edu] On Behalf Of Tuna Eken
    Sent: Sunday, March 09, 2008 12:04 AM
    To: sac-help<at>iris.washington.edu
    Subject: [SAC-HELP] Re: sac-help Digest, Vol 33, Issue 4





    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




    Citerar sac-help-request<at>iris.washington.edu:

    Send sac-help mailing list submissions to
    sac-help<at>iris.washington.edu

    To subscribe or unsubscribe via the World Wide Web, visit
    http://www.iris.washington.edu/mailman/listinfo/sac-help
    or, via email, send a message with subject or body 'help' to
    sac-help-request<at>iris.washington.edu

    You can reach the person managing the list at
    sac-help-owner<at>iris.washington.edu

    When replying, please edit your Subject line so it is more specific
    than "Re: Contents of sac-help digest..."


    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.
    -------------- next part -------------- An HTML attachment was
    scrubbed...
    URL:

    http://www.iris.washington.edu/pipermail/sac-help/attachments/20080307/0
    f44b481/attachment-0001.html

    ------------------------------

    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 fft 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




    ------------------------------

    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help


    End of sac-help Digest, Vol 33, Issue 4
    ***************************************




    _______________________________________________
    sac-help mailing list
    sac-help<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/sac-help







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