PREDICTION OF NONSTATIONARY EARTHQUAKE MOTIONS ON ROCK SURFACE.

Abstract

Nonstationary earthquake motion prediction models are proposed on the basis of rock surface-ground motion dataset. Ground motions on rock surface with the shear velocity of 600 to approx. 700 m/sec are dealt with. The ninety-one components of acceleration time histories on rock surface level are arranged, which consists of (i) rock surface-ground motions estimated from the accelerogams recorded on alluvial and diluvial sites, (ii) rock surface-ground motions modified from bed rock ground motions, and (iii) ground motions recorded on rock surface. On the basis of this dataset, two earthquake motion prediction models are developed, one (EMP-IB Model), a prediction model for given magnitude and epicentral distance, and the other (EMP-IIB Model), an advanced model which deals with the effect of successive faulting and relative site locations on ground motion characteristics.