Running delaytmR.m

The P-wave enhancement was used to produce 3 North bank and 3 South bank enhanced data sets. The following listing from the bref run documents the choice of parameters. The key parameter was to choose reciprocal shooting (changes the header search from shots to receivers as can be seen in the listing).

{listbref}
Program bref
 Line Number: 0001
 System matrix output File: G0001
 Data vector output File: D0001
   receiver x,y=     1049.       1104.
   receiver x,y=     1009.       1021.
   receiver x,y=     1051.       1108.
   receiver x,y=     1007.       1017.
   receiver x,y=     1054.       1113.
   receiver x,y=     1005.       1013.
  Number of traces=   19
  Parameters:
     Number of shots=    6
     Minimum offset =      10.0
     Maximum offset =     200.0
     Refraction analysis
     Average Receiver Spacing=    5.0079
     Ground Consistent Zone=    3.7559
     Input File Names:
          N000.seg
          S000.seg
          N001.seg
          S001.seg
          N002.seg
          S002.seg

listbref

The problem required 3 constraint equations. These were to set the 3 common geophone points and the neighboring shot points to have the same delaytime.

Figure 40: Solution from delaytmR.m analysis of 6 common geophone records and 3 constraints. Note, even after squishing the plot, there is about 12:1 vertical exaggeration on the structure.