| Project/Area Number |
15K13582
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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 |
Geology
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
HIROSE Takehiro 国立研究開発法人海洋研究開発機構, 高知コア研究所, グループリーダー代理 (40470124)
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| Co-Investigator(Renkei-kenkyūsha) |
TOMIOKA Naotaka 国立研究開発法人海洋研究開発機構, 高知コア研究所, 主任技術研究員 (30335418)
TAKAHASHI Miki 国立研究開発法人産業技術総合研究所, 活断層・地震研究センター, 主任研究員 (40470033)
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| Research Collaborator |
KISHIDA Minori
MIZOGUCHI Kazuo
PARK Yohan
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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| Keywords | 鏡肌 / 断層 / アスペリティ |
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| Outline of Final Research Achievements |
Real contacts of fault surfaces, called as asperity, is significant for understanding generation of earthquakes, because asperity is a potential site where strain energy of earthquakes is accumulated and released by coseismic slip during an earthquake. In this study, a hypothesis that slickensides (fault mirror surface) on a fault plane act as asperity of seismogenic faults is verified by measuring topographic characteristics of fault mirror surfaces corrected immediately after the earthquakes and by determining frictional property of marble mirror surfaces using a rotary shear apparatus. The results indicate that (1) mirror fault surface possess fractal property with fractal dimension of 1.06-1.29, and (2) strength of marble mirror surface does not recover when slip ceases. The fault mirror showing no frictional aging may be responsible for fault creep or slow earthquakes rather than asperity where strain energy is stored.
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