c anirec_synth_circle - anirec to compute synthetics for a specified model and
c a specified station location from one seismic record read from in_recfunk
c the code will take the station location and generate a ring of 120 events that are 90 degrees
c away, one for every 3 degrees back-azimuth. To do this we generate a great circle path
c with the station at the pole of the great circle
c modified to accept SACfiles with start time info in the header, in A-marker (ahead(9))
c because the timing information is not used, the value of A-marker is not important.
c However, in the synthetics, the A-marker and the T1-marker variables in the header are set to 5.0 seconds
c for easy analysis by recfunk codes that use the header information for timing.
c the synthetic files are s_NNN.bh[zrt], where NNN is the back azimuth.
c the code writes in_recpick_circle, a list of the filenames for recfunk_pick and other recfunk codes that
c expect the start time in the SAC header
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