Following a sequence of exploratory inversions, the data set was culled to remove events and SNCL's with fewer than 7 data each and to also remove data with event-SNCL distances greater than 500 km. The remaining differential data were then inverted simultaneously, via constrained linear least-squares, to determine the perturbations to the amplitude decay function () and the adjustment () for each SNCL with the constraints: (1) = -3; and (2) the sum of the s for selected SNCLs with historical values = the sum of their historical values. This approach was taken to ensure consistency with past magnitudes determined in Northern and Southern California.

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