[SAC-HELP] Error when merging sac files

Dylan Mikesell dmikesell at cgiss.boisestate.edu
Fri Jan 25 09:56:41 PST 2008


Everyone,

I am new to SAC and having problems with the merge command.

I am trying to merge vertical component files from one station over a 
day. The data is recorded in 30 minute sections. The error I am getting 
occurs as follows:

 WARNING: Time gap (zeros added): 07.223.00.26.56.9462.1.sac 
07.223.03.26.56.9462.1.sac
 END1: 2007 223 2 56 56 681
 BEG2: 2007 223 3 26 56 680


I can't figure out the problem and the headers aren't offering me any clues.

  FILE: 07.223.00.26.56.9462.1.sac - 1
 --------------------------------

      NPTS = 450000                              B = -3.200000e-01
         E = 1.799676e+03                       IFTYPE = TIME SERIES FILE
     LEVEN = TRUE                            DELTA = 4.000000e-03
      IDEP = UNKNOWN                        KZDATE = AUG 11 (223), 2007
    KZTIME = 00:26:57.000                   IZTYPE = EVENT ORIGIN TIME
     KSTNM = 09462                              CMPINC = -1.225500e+04
     KEVNM = 0722300261C1            IEVTYP = EARTHQUAKE
     KHOLE =                                        LOVROK = TRUE
     NVHDR = 6                                   NORID = 0
     NEVID = 0                                      LPSPOL = TRUE
    LCALDA = TRUE                           KCMPNM = 1C1
    KNETWK = XX

  FILE: 07.223.02.56.56.9462.1.sac - 2
 --------------------------------

      NPTS = 450000                              B = -3.200000e-01
         E = 1.799676e+03                       IFTYPE = TIME SERIES FILE
     LEVEN = TRUE                            DELTA = 4.000000e-03
      IDEP = UNKNOWN                        KZDATE = AUG 11 (223), 2007
    KZTIME = 02:56:57.000                   IZTYPE = EVENT ORIGIN TIME
     KSTNM = 09462                              CMPINC = -1.225500e+04
     KEVNM = 0722302561C1             IEVTYP = EARTHQUAKE
     KHOLE =                                        LOVROK = TRUE
     NVHDR = 6                                   NORID = 0
     NEVID = 0                                      LPSPOL = TRUE
    LCALDA = TRUE                           KCMPNM = 1C1
    KNETWK = XX

  FILE: 07.223.03.26.56.9462.1.sac - 3
 --------------------------------

      NPTS = 450000                              B = -3.200000e-01
         E = 1.799676e+03                       IFTYPE = TIME SERIES FILE
     LEVEN = TRUE                            DELTA = 4.000000e-03
      IDEP = UNKNOWN                      KZDATE = AUG 11 (223), 2007
    KZTIME = 03:26:57.000                  IZTYPE = EVENT ORIGIN TIME
     KSTNM = 09462                             CMPINC = -1.225500e+04
     KEVNM = 0722303261C1             IEVTYP = EARTHQUAKE
     KHOLE =                                        LOVROK = TRUE
     NVHDR = 6                                    NORID = 0
     NEVID = 0                                      LPSPOL = TRUE
    LCALDA = TRUE                           KCMPNM = 1C1
    KNETWK = XX

When I try to plot multiple days, the errors seams to occur at the same 
point in time. I am wondering if I lost the GPS timing at that time in 
the day. The sensors were in a very narrow valley.
Is there anyway to figure out what is wrong or where my timing gets 
messed up?

Thanks,

Dylan Mikesell
Boise State University
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