The Use of Pulse Shapes in Seismic Body Waves, to Determine the Nature of the Seismic Source
Semi-annual rept. no. 2
LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY
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We have shown that it is possible to build dynamically consistent models of rupture which heal in a causal and asymmetric fashion, and have generated a simple computational code by which it is possible to model a very general class of rupture growth and stopping behaviors. This A-model is similar to Savages elliptical model, but is dynamically feasible. We have computed pulse shapes and spectra for a particular form of our model, having a 70 unilateral component of rupture. The displacement pulse shapes, v squared-pulse shapes and integrated energy flux vary substantially over the focal sphere, providing the seismologist with a series of discriminants for the modelling of seismically recorded earthquakes. We plan to use this model extensively in order to interpret several large, multiply recorded aftershocks of the 1975 Oroville, California earthquake.