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SCRIPPS INSTITUTION OF OCEANOGRAPHY INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS UNIVERSITY OF CALIFORNIA, SAN DIEGO, LA JOLLA, CALIFORNIA 92093
Abstract
Ground motion produced by finite, kinematic fault surface is modeled at the surface of a homogeneous half-space. The Green's functions for point dislocations are summed to investigate the effects of different rupture velocities and source rise times. Displacements and velocities are compared for a bilateral and unilateral rupture. The method is used to model the displacements for a laboratory experiment involving a dynamic rupture in a homogeneous block of foam rubber. Good agreement between synthetic and model displacements is obtained at distances ranging from zero to somewhat greater than one fault length. The half-space Green's function summation method is then used to model the N65°E (transverse) component of displacement for the 1966 Parkfield earthquake. The 26-cm displacement pulse on this record is fit with a buried dislocation of 100 cm over a rectangular fault 30 km long and 6 km wide, with a depth of 3 km.
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