Japan Geoscience Union Meeting 2015

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Oral

Symbol S (Solid Earth Sciences) » S-VC Volcanology

[S-VC46] Dynamics of volcanic eruptions and igneous activities

Sun. May 24, 2015 4:15 PM - 6:00 PM 304 (3F)

Convener:*Tomofumi Kozono(Department of Geophysics, Graduate School of Science, Tohoku University), Yujiro Suzuki(Earthquake Research Institute, The University of Tokyo), Satoshi Okumura(Division of Earth and Planetary Materials Science, Department of Earth Science, Graduate School of Science, Tohoku University), Chair:Yujiro Suzuki(Earthquake Research Institute, The University of Tokyo)

4:30 PM - 4:45 PM

[SVC46-02] Evaluation of elastostatic effects of large earthquakes on the dike system around Mt. Fuji

*Masaki HOSONO1, Yuta MITSUI2, Hidemi ISHIBASHI2 (1.Faculty of Science, Shizuoka University, 2.Institute of Geosciences, Shizuoka University)

Keywords:Mt. Fuji, dike, large earthquakes, static stress changes

A recent study (Chesley et al., 2012) focused on mechanical effects of earthquakes on volcano systems, and calculated static stress change on the main dike of Mt. Fuji by the 1707 Hoei earthquake and the 1703 Genroku Kanto earthquake. In this study, we first performed validation tests of this previous study using my own codes, and confirmed that my calculation results and their results are the same. And then, we did the similar research calculating the normal stress perpendicular to the main dike and another dike that turned to be active after the 2011 Tohoku-oki earthquake. We examined the static stress changes on both dikes, by not only two earthquakes but nearby large earthquakes (the 762 Mino-Hida-Shinano earthquake, the 2011 Tohoku-oki earthquake, and possible Fujigawa-kako earthquake) as scenario earthquakes. The calculation results showed that the earthquakes having potentials to induce the eruption of Mt. Fuji were the Hoei earthquake and the Tohoku-oki earthquake, and the Fujigawa-kako earthquake. Moreover, we propose that the large earthquakes can be the switches of the dike activities beneath Mt. Fuji.