Following another sequence of exploratory inversions, the data set was further culled to include only broadband data SNCLs. The final inversion used data from 217 earthquakes which occurred throughout California for 560 broadband horizontal channels from the AZ, BK, CI and NC networks. For each event, differences in for all SNCL pairs were calculated, giving a dataset with 2607484 observations. These differences were simultaneously inverted to determine the station adjustment for each SNCL with the constraint: (PAS.E) + (PAS.N) + (BAR.N) + (MWC.E) + (MWC.N) + (PLM.E) + (PLM.N) + (RVR.E) + (RVR.N) + 1.5 * ( (BKS.E) + (BKS.N) + (BRK.N) + (BRK.E) + (MHC.N) + (MHC.E) ) = +0.943 (the sum of the historical values at these stations). The 1.5 multiplier is used to equalize the weighting of the 6 BK SNCLs and the 9 CI SNCLs. A map of the CISN SNCL adjustments is shown in Figure 2.27.
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