| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2009: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Research Abstract |
We deployed a dense seismic array consisting of 120 portable stations, which crossed fault zones associated with the Iwate-Miyagi Nairiku Earthquake in 2008, and retrieved continuous seismic waveforms during about ten days. Based on tomographic analysis using the waveforms of small earthquakes located close to the array, we estimated a seismic structure of the fault zones. Bands of low-velocity layers were imaged roughly parallel to along pre-existing faults. We interpret that a likely-explanation of these low-velocity layers is presence of crustal fluids or cracks within the fault zones. It is thus inferred that the strength of fault might be weak.
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