| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
Volcano tectonic earthquakes originate from brittle fracture caused by stress changes in surrounding rocks due to magma intrusion. Magma intrusion causes not only a swam of volcano tectonic earthquakes and but also significant crustal deformation. An empirical equation is derived for the volume change of the deformation sources and seismic moment (energy) of volcano tectonic earthquakes. Using this empirical formula, we can estimate the volume of magma intrusion from observations of volcano tectonic earthquakes. The growth of a dike, a form of magma intrusion, increases the stress in the surrounding rocks, and the stress exceeds the fracture strength, which explains the occurrence process of volcano tectonic earthquakes. It is also revealed that a cluster of volcano tectonic earthquakes progressed from shallow to deep depths with the growth of the dike.
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