Dynamic rupture in a layered medium: The 1966 Parkfield earthquake

Author:

Archuleta Ralph J.1,Day Steven M.2

Affiliation:

1. U.S. Geological Survey 345 Middlefield Road Menlo Park, California 94025

2. Systems, Science and Software Post Office Box 1620 La Jolla, California 92038

Abstract

abstract A method for computing ground motion from a propagating stress relaxation in a vertically heterogeneous medium was developed wherein computational efficiency is enhanced by separating the source, a three-dimensional calculation, from the wave propagation, a two-dimensional calculation. As an application of this technique, displacement-time histories were computed corresponding to those determined from accelerograms recorded during the 1966 Parkfield, California earthquake. On the basis of these comparisons, an effective stress of 25 bars, an average slip of 43 cm, and a moment of 2.32 × 1025 dyne-cm were determined for the Parkfield earthquake.

Publisher

Seismological Society of America (SSA)

Subject

Geochemistry and Petrology,Geophysics

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