ANALYTICAL STUDY ON NEAR-SOURCE GROUND MOTIONS CONSIDERING VARTABLE-SLIP RUPTURE SOURCE AND IRREGULAR UNDERGROUND STRUCTURE

Theoretical ground motion characteristics taking into account the variable slip source and the deep irregular underground structure are analytically investigated using hyperelement method. The ۳D wave propagation analyses have been performed using the ۲D deep irregular underground structure model of Kobe City. The ground motion characteristics are discussed for different asperity sizes. Ground motion amplification characteristics at sediment site to rock site are his-cussed, far one asperity models with different size and also for two asperities models. Three components, fault normal (FN), fault parallel (FP) and vertical (UD), of velocity waveforms and distributions of PGVs are investigated along FN and FP sections for different wavefielci