3次元盆地端部構造の境界近傍における地震動増幅特性

概要

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This study investigates ground motion amplification adjacent to boundary of 3D basin-edge structure as can be seen in the deep subsurface structure beneath Kobe City. The 3D results are compared with those by 2D analyses of 10 fault- normal sections in the Kobe City to clarify the 3D and 2D site effects on the ground motions during the 1995 Kobe earthquake. Significant difference cannot be seen in the distributions of the peak ground velocity between the 3D and 2D results. In the heavily damaged region, the extracted wave components of 3D site effects are smaller than those of 2D effects. Parametric study using idealized 3D bedrock-sediment models reveals that peak values of the ground motion adjacent to the concave basin-edge remains almost the same as the 2D model unless the planar configuration of the boundary is sharply varied.
2002-10-30