Evaluation on the structural features of active fault damage zone and activity of faults.
| Project/Area Number |
15K01248
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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 |
Natural disaster / Disaster prevention science
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| Research Institution | Kyoto University |
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Principal Investigator |
Lin Aiming 京都大学, 理学研究科, 教授 (90283861)
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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 |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 活断層 / 断層破砕帯 / 地震断層 / 脈状断層岩 / 断層摩擦熱 / 流体化作用 / 震源断層 / 断層物性 / 活断層破砕帯 / 六甲断層 / 野島断層 / 花折断層 / 破砕帯トレンチ掘削 / 定方位サンプル / 断層ガウジ |
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| Outline of Final Research Achievements |
Based on field investigations and meso- and microstructural analyses of fault zones of the active Nojima Fault and Arima-Takatsuki Tectonic Line active fault system, the following results have been obtained:
1) the vein networks of pseudotachylyte with both melt and crush origins, as well as ultracataclastic rocks formed by rapid injection of ultrafine- to fine-grained material are sourced from pulverized ultracataclastic rocks in seismogenic fault zones under thermal pressurization and fluidization during seismic faulting; 2) the fault damage zones of both faults have been strongly pulverized; 3) the recurrence interval of large earthquakes in the Nojima Fault is inferred to be =900~1000 years that are shorter than that previously reported; 4) the 1596 Keicho-Fushimi earthquake probably ruptured the western segment around the Arima-Spring. Field investigations also demonstrated that the Mw 7.1 2016 Kumamoto earthquake ruptures the preexisting active faults.
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Report
(4 results)
Research Products
(43 results)
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[Journal Article] Millennium recurrence interval of morphogenic earthquakes on the seismogenic fault zone that triggered the 2016 Mw 7.1 Kumamoto earthquake, SW Japan2017
Author(s)
Lin, A., Satsukawa, T., Bian, D. Sado, K., Takahashi, N., Hirata, S
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Journal Title
Bulletin of the Seismological Society of America
Volume: 印刷中
Related Report
Peer Reviewed
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