Origin of regularity and complexity of earthquakes
| Project/Area Number |
26400445
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Kato Naoyuki 東京大学, 地震研究所, 教授 (60224523)
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| Co-Investigator(Kenkyū-buntansha) |
勝俣 啓 北海道大学, 理学研究院, 准教授 (10261281)
川村 光 大阪大学, 理学研究科, 教授 (30153018)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 地震活動 / 摩擦 / シミュレーション |
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| Outline of Final Research Achievements |
In order to understand the origin of complexity of earthquakes, we conduct numerical simulations using a spring-block model and an elastic continuum model. By the use of a rate- and state-dependent friction law, the slip nucleation process and various kinds of aseismic slip processes are reproduced in the spring-block model. In the elastic continuum model, complex earthquake cycles are reproduced even with a few asperities. From analyses of global earthquake catalogue, precursory seismic quiescence was found for some great earthquakes, which can be explained by preseismic sliding expected from the models with rate- and state-dependent friction.
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Report
(4 results)
Research Products
(24 results)
