兵庫県南部地震時の神戸市内における基盤地震勣および地盤増幅特性

概要

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This study investigates bedrock motions on an outcrop of Rokko granite rock and site amplification characteristics due to deep irregular underground structures in Kobe City during the 1995 Hyogo-ken Nanbu earthquake. Six sections normal to Rokko Fault are modeled based on 2-D seismic profiles determined from geological surveys. Peak velocities of bedrock motions deconvolved from 6 records show almost the same level, 50-60cm/s, while those on an outcrop of Osaka group are 86-137m/s. Ground motions at sea side area can be well simulated, indicating that bedrock motions are expected to be properly evaluated. In soil responses on Osaka group, the large amplifications can be commonly seen at area about 1km away from basin edge to seaside, while the transfer functions from the bedrock are varied according to the bedrock shapes. Distributions of maximum responses are accountable for the distributions of damaged structures.
社団法人日本建築学会の論文
1998-09-30