2012 Fiscal Year Final Research Report
Intuitive understanding of slow earthquakes using model experiments
| Project/Area Number |
23654155
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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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 |
NAMIKI Atsuko 東京大学, 大学院・理学系研究科, 助教 (20450653)
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| Co-Investigator(Kenkyū-buntansha) |
IDE Satoshi 東京大学, 大学院・理学系研究科, 准教授 (90292713)
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| Co-Investigator(Renkei-kenkyūsha) |
YAMAGUCHI Tetsuo 九州大学, 工学研究院, 准教授 (20466783)
SUZUKI Takehito 東京大学, 大学院・理学系研究科, 特任助教 (10451874)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 地震現象 |
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| Research Abstract |
Slow earthquakes are observed beneath the seismogenic zone. The rock consisting the Earth is frequently modeled as a Maxwell fluid which behaves elastically only when it deforms at a time scale which is sufficiently short compared to the relaxation time scale. However, it still remains unclear how the seismicity changes with these brittle/ductile and elastic/viscous transition. Here, we perform shear deformation experiments using quasi-Maxwell fluid under different strain rates, and show that the same material can cause earthquakes associated with elastic rebound as well as viscous flow. Around the threshold, both earthquakes in which ruptures propagate at a shear wave velocity and viscous relaxation occur simultaneously.
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