Calculations of Near Field, Earthquake Ground Motion

Abstract
A stick-slip rupture model has been incorporated into a two- dimensional (plane strain) Lagrangian code with the added feature that rupture initiation is plastic work dependent. Realistic laboratory test data have been used as input to the model. Theoretical seismograms have been generated in both the frequency and time domain along with a decomposition of the ground motion into P and S components. The calculations suggest how estimates of fault length, rupture velocity and dynamic stress drop may be obtained from near field data. These estimates provide an initial specification of the parameters required by the rupture model in order to match a given set of near field data.

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