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A two-dimensional finite element model was developed for the source region of the San Fernando earthquake. Stochastic inversion of the surface displacement data of Alewine was carried out to obtain estimates of the displacements and stress drops along the actual fault surface in the finite element model. We calculate an average slip of 222 cm with a r m s fit to the data of 8 cm. The average computed stress drop was 290 bar, with a maximum of 650 bar. Using these calculated stresses in a dynamic model of the earthquake, we compute theoretical accelerograms for the Pacoima Dam site.
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McCowan et al. (1977) studied this question.
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