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- Shibazaki Bunichiro
- International Institute of Seismology and Earthquake Engineering, Building Research Institute
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- Noda Hiroyuki
- Department of Mathematical Science and Advanced Technology, Japan Agency for Marine-Earth Science and Technology
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抄録
<p>Some observational studies have suggested that the 2011 great Tohoku-Oki earthquake (Mw9.0) released a large portion of the accumulated elastic strain on the plate interface owing to considerable weakening of the fault. Recent experimental and theoretical studies have shown that considerable dynamic weakening can occur at high slip velocities because of thermal pressurization or thermal weakening processes. This paper reviews several models of the generation of megathrust earthquakes along the Japan Trench subduction zone, that considers thermal pressurization or a friction law that exhibits velocity weakening at high slip velocities, and it discusses the causes of megathrust earthquakes. To reproduce megathrust earthquakes with recurrence intervals of several hundreds of years, it will be necessary to consider the existence of a region at the shallow subduction plate boundary where significant dynamic weakening occurs due to thermal pressurization or other thermal weakening processes.</p>
収録刊行物
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- Journal of Disaster Research
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Journal of Disaster Research 9 (3), 252-263, 2014-06-01
富士技術出版株式会社
