1998 Fiscal Year Final Research Report Summary
Numerical modeling for seismic cycle of great interplate earthquakes along the Nankai trough following a friction law
| Project/Area Number |
08454124
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体地球物理学
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| Research Institution | Nagoya University |
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Principal Investigator |
HIRAHARA Kazuro Graduate School of Science, Nagoya University, Professor, 大学院・理学研究科, 教授 (40165197)
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| Co-Investigator(Kenkyū-buntansha) |
SHIBUTANI Takurou Disaster Prevention Research Institute, Kyoto Univ., Researcher, 防災研究所, 助手 (70187417)
KUMAGAI Hiroyuki School of Science, Nagoya Univ., Researcher, 理学部, 助手 (00260589)
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| Project Period (FY) |
1996 – 1998
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| Keywords | Friction law / Nankai trough / Great interplate earthquake / Seismic cycle / FEM / Numerical modeling |
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| Research Abstract |
The following researches were made for the numerical modeling of seismic cycle of great interplate earthquakes along the Nankai trough.
(1) We implemented a friction law in FEM modeling to simulate seismic cycle in a viscoelastic heterogeneous medium. We constructed 2-D viscoelastic FEM model where a plate is subducting beneath an island arc with a crust and a mantle wedge and assigned frictional parameters down to a depth of 70 km along the plate-interface.
(2) We simulated earthquake generation using a variety of friction laws based on block-spring model to compare the results with the observed statistics of earthquake occurrence.
(3) We constructed the 3-D Philippine Sea plate subducting along the Nankai trough beneath southwest Japan, using the distribution of subcrustal earthquakes for the seismic slab and a tomographic technique for the aseismic slab in the deeper portion.
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Research Products
(8 results)
