| Budget Amount *help |
¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
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| Outline of Final Research Achievements |
In order to estimate the deep Earth structure, we proposed to treat teleseismic P-wave microseisms as spatially localized events with a long time duration. For this purpose, we analyzed Hi-net data in Japan from 2004 to 2020 and compiled the centroid single force catalog of P-wave microseisms in the frequency band of 0.1-0.25 Hz. The catalog values were quantitatively compared with ocean wave action models and found to be consistent in most regions.
We attempted to detect P-s converted waves in the transition layer just below the Japanese Islands using the catalog. First, we estimated the source time function of incident P waves using array analysis and removed its effect from the horizontal records. As a result, we succeeded in detecting P-s waves at the 410 km and 660 km discontinuities below the stations.
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