3-D SIMULATION OF NEAR FIELD MOTION IN IRREGULAR GROUND

Abstract

In this paper, near-filed motion in irregular ground is simulated by a 3-D FE-BE method. This method makes it feasible to model arbitrarily-shaped 3-D basin structure and simulate its response to seismic faulting. Following a simple analysis, seismic motion of San Fernando valley during the 1994 Northridge earthquake is simulated. At Sylmar site, the peak horizontal displacement of the synthesized motion is consistent with that of the observed motion. Peak velocity map obtained by the simulation is also discussed in comparison with that based on observations.