[SAC-HELP] getfhv - t0 marker

[Arthur Snoke]

I have not looked aat the code, but I have looked at the discussion about 
header variables in the manual, and I think your problem is that the 
origin time is not an explicit header variable.  In fact, it says that you 
can introduce ten different times t0-t9.

One way that might work for you is to use ch to define t0 to be the 
origin time and then work with the t0 you have defined.

On Sun, 24 Apr 2011, Kayla Kroll wrote:

> Hello,
>
>    I would like to get the 't0' header information from a large number of
> events. The fortran code (f77) below works perfectly when I replace the 't0'
> in the getfhv call by 'a', however when written as shown, I get the
> following error:
>
>  ERROR: Undefined header field value. t0
>
>       call rsac1(fn2,array,nlen,beg,del,max,nerr)
>        if (nerr.gt.0) then
>        print*, nerr
>        go to 8888
>        endif
>       call getfhv('t0',t0,nerr)
>        if(t0.lt.0) then
>        go to 9999
>        endif
> 
> 
> I have also tried replacing 't0' with 't1' as it is in the manual, but that
> produces the same error.
> 
> The data does exist in the headers:
> 
> [aten:EventWaveforms/0406_0614/10145282] kakroll% sac
>  SEISMIC ANALYSIS CODE [02/05/2008 (Version 101.1)]
>  Copyright 1995 Regents of the University of California
> 
> SAC> r *ZY*EHN*sac
> 10145282.ZY.COON.EHN.sac 10145282.ZY.MLDN.EHN.sac 10145282.ZY.OCCM.EHN.sac
> 10145282.ZY.OYSB.EHN.sac 10145282.ZY.PNTO.EHN.sac 10145282.ZY.SHCM.EHN.sac
> 10145282.ZY.USG.EHN.sac 10145282.ZY.WAGN.EHN.sac
> SAC> lh t0
>
>
>   FILE: 10145282.ZY.COON.EHN.sac - 1
>  ------------------------------
>
>      t0 = 5.096052e+00
>
>   FILE: 10145282.ZY.MLDN.EHN.sac - 2
>  ------------------------------
>
>      t0 = 3.196018e+00
>
>   FILE: 10145282.ZY.OCCM.EHN.sac - 3
>  ------------------------------
>
>      t0 = 3.546471e+00
> 
> 
> Any help would be appreciated.
> 
> Thank you,
> Kayla Kroll
> UC Riverside
> 
>