DTIC TAB Unannounced(1) occurred within, or on the perimeter of, the area of interest, (2) produced good long-period surface wave records at WWSSN stations for which the
$.2 epicenter-to-station lines lie within the regions being investigated, and (3) generated good, large recordings at a sufficient number of stations to ensure an accurate fault plane solution. When a suitable earthquake was found, an extensive data processing and data reduction system was applied to transform the data into phase velocity curves for each of the selected epicenter-to-station lines.The complete set of phase velocity curves (for fundamental- in the model space, by a procedure usually described as "deltaness".
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