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

Content Provider	Springer Nature Link
Author	Fujita, Eisuke Kozo, Tomofumi Ueda, Hideki Koh, Yuhki Yoshioka, Shoichi Toda, rio Kikuchi, Aiko Ida, Yoshiaki
Copyright Year	2013
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.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	75
Issue Number	1
e-ISSN	14320819
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-01-12
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tohoku earthquake Triggered earthquake Deep long period earthquakes Finite element method Excitation of magma system Geology Geophysics/Geodesy Mineralogy Sedimentology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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