Thread: Re: DATA FORMAT

Started: 2019-07-25 08:40:44
Last activity: 2019-07-25 08:40:44
Topics: SAC Help
Robert Casey
2019-07-25 08:40:44

Hi Pratyush-

What I would be looking for is indications that an event origin has been marked in the SAC header. Once you read the file, you can list the header contants:

SAC> read /data/sac/IU.RAO.00.BHZ.M.2019.206.143943.SAC
SAC> listhdr


FILE: /data/sac/IU.RAO.00.BHZ.M.2019.206.143943.SAC - 1
---------------------------------------------------

NPTS = 27440
B = 5.360000e-04
E = 6.859756e+02
IFTYPE = TIME SERIES FILE
LEVEN = TRUE
DELTA = 2.500000e-02
DEPMIN = -1.119710e+05
DEPMAX = 1.439620e+05
DEPMEN = 1.016922e+04
OMARKER = 25.98 <-----------------
KZDATE = JUL 25 (206), 2019
KZTIME = 14:39:43.019
KINST = Streckei
KSTNM = RAO
CMPAZ = 0.000000e+00
CMPINC = 0.000000e+00
STLA = -2.924500e+01
STLO = -1.779290e+02
STEL = 5.950000e+01
STDP = 5.000000e-01
KEVNM = Kermadec Islands <-----------------
EVLA = -3.122300e+01 <-----------------
EVLO = -1.773958e+02 <-----------------
EVDP = 1.000000e+01 <-----------------
KHOLE = 00
DIST = 2.252003e+02 <-----------------
AZ = 3.466916e+02 <-----------------
BAZ = 1.669587e+02 <-----------------
GCARC = 2.024704e+00 <-----------------
LOVROK = TRUE
NVHDR = 6
SCALE = 2.447790e+09
LPSPOL = TRUE
LCALDA = TRUE
KCMPNM = BHZ
KNETWK = IU

On Jul 25, 2019, at 5:21 AM, pratyush anand <pratyush1stu<at>gmail.com> wrote:

Hi, I have downloaded data from WILBER3, the data is in sac format (although other formats like SEED or miniseed are available. For each event seismograms are like .BHZ, .BHE, .BHN which is okay. However, while computing P receiver function from the data, MATLAB program is saying P arrival (or S arrival is not found). I have not installed SAC software as such. I am working on Redhat Linux.

Thanks for responding. Seeking for guidance.

On Thu, Jul 25, 2019 at 1:09 AM Robert Casey <rob<at>iris.washington.edu <rob<at>iris.washington.edu>> wrote:

Hi Pratyush-

If you do a LISTHDR in SAC, what does it return? Also, what platform/OS are you running Matlab on?

-Rob


On Jul 24, 2019, at 11:50 AM, pratyush anand <pratyush1stu<at>gmail.com <pratyush1stu<at>gmail.com>> wrote:

Hi all, I am computing receiver function and I am getting problem with SAC data that i have downloaded, matlab code saying S arrival is not found in header.

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