| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
In this study, the seismic velocity discontinuities and three-dimensional seismic velocity structures were estimated by receiver function analysis and seismic tomography analysis using data from linear array seismic observations independently conducted in Southern Kyushu to estimate the properties of the source area of the Hyuga-nada earthquake and the magma supply process to volcanoes such as Sakurajima and Kirishima.
Receiver function analysis shows low-velocity layers in the lower crust below the two volcanoes mentioned above. The continental Moho at the mantle wedge is obscure, indicating that the seismic velocity in the mantle is not faster than that in the lower crust. Tomographic analysis revealed a low-velocity anomaly in the vicinity of the above two volcanoes at a depth of 10 km and in the oceanic crust at a depth of 30-40 km. These features can be attributed to fluids such as slab-derived fluids and magma.
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