Radiation of strong ground motion from various fault types

Takao KAGAWA

Geo-Research Institute
4-3-2, Itachibori, Nishi-ku, Osaka, 550-0012, Japan
E-mail: kagawa@geor.or.jp

Abstract

Radiation characteristics of strong ground motion from faults are explained with several examples caused by recent earthquakes. Some Images of sesimic intensity deistributions due to various types of faults are demonstrated in the presentation. Fault specific and also site specific estimation of surface ground motion is required for aseismic design or disaster prevention. In the case, fault type afects much on the prediction of seismic ground motion due to finite fault and rupture propagation on the fault. For example, close to epicenter of strike slip fault, ground motion is rather smaller than fault edge zone. In case of dip slip fault, ground motion on hanging wall tends to be larger than foot wall. Rupture starting point, ie. hypocenter, and asperity model , ie. area radiating strong seimic wave, are important parameters on surface ground motion close to fault. Understanding these characteristics is useful to evaluate the potential hazard form a target fault.

raeg99@tansa.kumst.kyoto-u.ac.jp

Last modified: Fri Nov 12 09:21:15 1999