# Stress field change around the Mount Fuji volcano magma system caused by the Tohoku megathrust earthquake, Japan

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## Abstract

Crustal deformation by the *M* _{ w } 9.0 megathrust Tohoku earthquake causes the extension over a wide region of the Japanese mainland. In addition, a triggered *M* _{ w } 5.9 East Shizuoka earthquake on March 15 occurred beneath the south flank, just above the magma system of Mount Fuji. To access whether these earthquakes might trigger the eruption, we calculated the stress and pressure changes below Mount Fuji. Among the three plausible mechanisms of earthquake–volcano interactions, we calculate the static stress change around volcano using finite element method, based on the seismic fault models of Tohoku and East Shizuoka earthquakes. Both Japanese mainland and Mount Fuji region are modeled by seismic tomography result, and the topographic effect is also included. The differential stress given to Mount Fuji magma reservoir, which is assumed to be located to be in the hypocentral area of deep long period earthquakes at the depth of 15 km, is estimated to be the order of about 0.001–0.01 and 0.1–1 MPa at the boundary region between magma reservoir and surrounding medium. This pressure change is about 0.2 % of the lithostatic pressure (367.5 MPa at 15 km depth), but is enough to trigger an eruptions in case the magma is ready to erupt. For Mount Fuji, there is no evidence so far that these earthquakes and crustal deformations did reactivate the volcano, considering the seismicity of deep long period earthquakes.

## Keywords

Tohoku earthquake Triggered earthquake Deep long period earthquakes Finite element method Excitation of magma system## Notes

### Acknowledgments

We are very grateful to Takuya Nishimura who provided the fault information concerning the 2000 Miyakejima volcano and the off-Izu peninsula crustal deformation. Masae Kikuchi, Fusako Sakamoto, Mariko Isohata, and Hiroko Sawabe kindly supported us in analyzing DLP event data of Mount Fuji. We also acknowledge Michael Manga, Thomas Walter and Jacopo Selva to improve our paper.

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