| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Research Abstract |
We investigated the effects of tidal stress on occurrence of low-frequency earthquakes and small repeating earthquakes in Japan. While statistically significant phase selectivity was found for the low-frequency earthquakes, no significant result was obtained for the small repeating earthquakes. The characteristics of phase selectivity changed after the 2011 Tohoku-oki earthquake.
Assuming periodic stress perturbation and rate- and state-dependent friction on the fault, we conducted a numerical simulation of asperity rupture. When the amplitude of periodic stress is the same, phase selectivity of asperity rupture is more significant for smaller fracture energy at the asperity. This result indicates that the fracture energy of small repeating earthquakes may be estimated from the observation of phase selectivity.
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