震源インバージョンと地震動有限差分シミュレーションを用いた大阪平野北部地域の三次元地下構造モデル

概要

論文の詳細を見る
We tried to model a three-dimensional (3-D) basin structure in the north of the Osaka basin using recordings at 8 sites of the earthquake event of M_<JMA>=5.4 that occurred at 7:38 on 17 January 1995. A construction procedure is as follows. We at first made an initial 3-D basin model of the region from the results of geophysical explorations and geological surveys as well as the source model inverted from waveforms of body wave portion by the genetic algorithm. Then, accounting for existing information of the surface geology and the explorations, we iteratively revised the model by decreasing the difference of later arrivals between calculated and recorded earthquake motions. The model derived by this procedure well explained not only body wave portions at all the sites but also later arrivals except for two sites. This result indicates that a reliable 3-D basin model is possible to construct using recordings of small to moderate size earthquake events, if an initial 3-D basin model is existed.
社団法人日本建築学会の論文
2002-02-28