S IMULATED GROUND MOTIONS FOR HYPOTHESIZED M w = 8 SUBDUCTION EARTHQUAKES IN WASHINGTON AND OREGON

Abstract

The amplitude and duration of strong ground motions from hypothe-sized M w = 8 subduction zone thrust earthquakes in the Puget Sound-Portland region were estimated using a semi-empirical method. The simulation procedure assumes the rupture surface may be represented by a grid of fault elements. Finite difference wave simulation in a detailed 2-D velocity structure identifies direct S and the Moho postcriti-cal reflection as the primary components of the S wave field at horizon-tal distances of 0 to 150 km. Green's functions containing these two arrivals are computed with generalized ray theory in an equivalent 1-D structure for each source element-receiver propagation path. Scattering and attenuation structure are empirically modeled by the use of cor-rected accelerograms from M w- 7 Michoacdn, Mexico, and Valparat'so, Chile, aftershocks for the fault element source functions. Different site conditions are empirically included in the simulation procedure by usin

Similar works

This paper was published in CiteSeerX.

Having an issue?

Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.