| 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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| 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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