| Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥15,080,000 (Direct Cost: ¥11,600,000、Indirect Cost: ¥3,480,000)
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| Outline of Final Research Achievements |
We deployed a very dense seismic array near the surface traces of Futagawa active fault, which hosted the 2016 Kumamoto earthquake in Kyushu, to investigate the detailed distribution of earthquakes around the upper limit of the seismogenic zone. After analyzing the continuous seismic waveform data during about 50 days, we revealed that hypocenters roughly aligned along a NW-dipping plane, which is consistent with the inclination of the Futagawa fault and the aftershock distribution of the Kumamoto earthquake. We have not detected any earthquakes at depths shallower than about 2 km beneath the fault surface traces. The magnitude of earthquakes at shallow depths is smaller than that at deep earthquakes, indicating a transition of frictional property along the fault-dip.
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