| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
We have applied a method to use cross correlations of noise records at two stations, auto correlations at single station, cross-correlations between different components at single station for stably detecting seismic velocity changes in Japan by seismic interferometry. Seismic velocity changes detected have been decomposed into coseismic changes and the following post-seismic exponential decays associated with the 2008 Iwate-Miyagi Nairiku earthquake and the 2011 off the Pacific Coast of Tohoku earthquake (Tohoku-Oki ) earthquake, and seasonal variations. Coseismic and post-seismic changes are attributed to damages and their recovery at shallow depths due to strong-ground motion. Seasonal variations may have some relation to changes in the ground-water level.
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