| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Outline of Final Research Achievements |
We proposed a method to determine focal mechanisms of non-volcanic tremors using S-wave polarization data. Because the shear-wave splitting analysis indicated the need of the correction for splitting effects, we also developed a procedure to recover the source S-wave polarization angle. We applied the present method to a tremor sequence at Kii Peninsula, southwest Japan and confirmed its applicability. Most estimated focal mechanism solutions show low-angle thrust faults, which are basically consistent with the geometry of the plate interface. We also found some events that contain strike-slip components at a specific location, providing us an important tool for inferring detailed stress fields around the plate boundary as well as the geometry of plate interface.
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