Finite-element simulations of long-period ground motions: Japanese subduction-zone earthquakes and the 1906 San Francisco earthquake |
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| Authors: | Yasushi Ikegami Kazuki Koketsu Takeshi Kimura Hiroe Miyake |
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| Institution: | (1) Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan;(2) Science and Engineering Systems Division, ITOCHU Techno-Solutions Corporation, 3-2-5, Kasumigaseki, Chiyoda-ku, Tokyo 100-6080, Japan |
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| Abstract: | Large earthquakes at shallow depths commonly excite long-period ground motions in distant sedimentary basins, thereby inflicting
damage upon large-scale structures. For example, the 2003 Tokachi-oki earthquake, Japan, damaged oil tanks in the Yufutsu
Basin, located 250 km from the epicenter. Similar long-range effects were also observed during the 2004 earthquake off Kii
Peninsula, Japan. In this study, we present the results of simulations of these earthquakes undertaken using the finite element
method (FEM) with a voxel mesh. In addition, to examine whether the 1906 San Francisco earthquake excited long-period ground
motions in the Los Angeles-area basins, we performed long-period ground motion simulations of most of the California region.
The FEM simulations confirmed the importance of path effects for the development of long-period ground motions. |
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| Keywords: | Finite element method Long-period ground motion Los Angeles Basin 1906 San Francisco earthquake 2003 Tokachi-oki earthquake 2004 off Kii Peninsula earthquake |
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