| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
We examined the broadband waveform of deep-focus earthquakes occurring beneath Sea of Japan and find that the S waveforms suddenly change to show low-frequency precursor as the source depth increase over 400 km. Since it is anticipated to be occur due to the effect of wedge-shaped low-wavespeed MOW, we conducted finite-difference method simulation of seismic wave for the deep Vladivostok earthquake (578 km, Mw6.8) of 12 Feb. 2010. The result of simulation demonstrateed that the effect of low-wavespeed anomaly of MOW for guiding seismic wave in frequency between 2 to 4 Hz towards upward along the slab. Due to this, the slab-waveguide effect becomes 3 times larger than that without MOW.
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