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Wave train characteristics of long-range, high-frequency P_n,S_n crossing an ocean bottom hydrophone array

HAWAII INSTITUTE OF GEOPHYSICS UNIVERSITY OF HAWAII AT MANOA, 2525 CORREA ROAD, HONOLULU, HAWAII 96822

Abstract

During February and March 1976 high-frequency P_n,S_n phases from several earthquakes in the distance range 18° to 29° were recorded on magnetic type from an array of bottom mounted hydrophones near Wake Island. Large discrepancies were found between the actual arrival sequences of these phases and those expected for uniform propagation of a plane wave front across the array. Furthermore, the signal envelopes of the wave trains were dissimilar on different hydrophones for any given P_n,S_n phase. Comparisons between arrival sequences on the different hydrophones and between the signal envelopes on a given hydrophone from groups of earthquakes with nearly identical hypocenters indicate that differences in velocity structure near individual hydrophones cannot explain these observations. They are more likely the result of either the mechanism of generation or of long-range propagation for P_n and S_n, or both.