Picking First Breaks

This topic was initially covered in the down-hole section 6.8.1. As described in that section, one copies the file segpic.m into the working directory, starts Octave and picks first arrivals. The program, bpic, is used to insert the pick times into the trace headers. Not all traces can be picked due to some background noise. In those cases, one should set the pick time to exactly zero, since program bref will use that convention to build suggested constraint equations. Figure 36 shows trace 20 of k011.seg as it appears during the execution of segpic.m in Octave. My picks are included in the data sample distribution as files k010.pic and k011.pic for comparison with your own picks.

Figure 36: Trace 20 as seen in segpic.m run