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Published February 1988 | Published
Journal Article Open

Modeling strong motions produced by earthquakes with two-dimensional numerical codes


We present a scheme for generating synthetic point-source seismograms for shear dislocation sources using line source (two-dimensional) theory. It is based on expanding the complete three-dimensional solution of the wave equation expressed in cylindrical coordinates in an asymptotic form which provides for the separation of the motions into SH and P-SV systems. We evaluate the equations of motion with the aid of the Cagniard-de Hoop technique and derive close-formed expressions appropriate for finite-difference source excitation.

Additional Information

© 1988, by the Seismological Society of America. Manuscript received 30 March 1987. We thank Richard Stead, Heidi Houston, and Gladys Engen for their reviews, and Robert Clayton for his efforts in developing the original finite-difference code. This work was supported by the Geophysical Sciences Division of the Air Force Geophysics Laboratory under Contract F19628-85-K-0017 and monitored by the Defense Advanced Research Projects Agency. Contribution no. 4458, Division of Geological and Planetary Sciences, California Institute of Technology.

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