Quasi-Static Stress Change Around Mount Fuji Region Due to Tohoku Mega-Thrust Earthquake
Eisuke Fujita*, Tomofumi Kozono**, Norio Toda***,
Aiko Kikuchi***, and Yoshiaki Ida***
*National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
**Department of Geophysics, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
***Advance Soft Corporation, 4-3 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan
The 2011 Tohoku mega-thrust earthquake caused huge crustal deformation over a wide are of Mainland Japan. Many mega-thrust earthquakes worldwide have triggered volcanic eruptions nearby, and it is assumed that stress changes due to the Tohoku earthquake resulted in a perturbation to the magma system. The objectives of our study is to evaluate this perturbation quantitatively and to analyze the mechanism of the interaction between mega-thrust earthquakes and volcanic eruptions. This paper focuses on quasi-static stress change due to viscous relaxation of a source region and the surrounding area.
-  T. R. Walter, “How a tectonic earthquake may wake up volcanoes stress transfer during the 1996 earthquake-eruption sequence at the Karymsky Volcanic Group, Kamchatka,” Earth Planet. Sci. Lett., Vol.264, pp. 347-359, 2007.
-  L. E. Lara, J. A. Naranjo, and H. Moreno, “Rhyodacitic fissure eruption in Southern Andes (Cordon Caulle: 40.5S) after the 1960 (Mw9.5) Chilean earthquake: a structural interpretation,” J. Volcanol. Geotherm. Res., Vol.138, pp. 127-138, 2004.
-  T. R. Walter and F. Amelung, “Volcanic eruptions following M ≥ 9 megathrust earthquakes: a structural interpretation,” J. Volcanol. Geotherm. Res., Vol.138, pp.127-138, 2004.
-  M. Koyama, “Mechanical coupling between volcanic unrests and large earthquakes: a review of examples and mechanics,” J. Geography, Vol.111, pp. 222-232, 2002 (in Japanese with English abstract).
-  M. Koyama, “Database of eruptions and other activities of Fuji Volcano, Japan, based on historical records since AD 781,” Yamanashi Institute of Environmental Sciences, Fuji Volcano, pp. 119-130, 2007 (in Japanese with English abstract).
-  S. Ozawa, T. Nishimura, H. Suito, T. Kobayashi, M. Tobita, and T. Imakiire, “Coseismic and post seismic slip of the 2011 magnitude-9 Tohoku-Oki earthquake,” Nature, Vol.475, pp. 373-377, 2011.
-  S. Toda, J. Lin, and R. S. Stein, “Using the 2011 Mw0.9 off the pacific coast of Tohoku earthquake to test the coulomb stress triggering hypothesis and to calculate faults brought closer to failure,” Earth Planets Space, Vol.63, pp. 725-730, 2011.
-  Japan Meteorological Agency, “List of activated volcanoes after 2011 Tohoku earthquake,” 2011 (in Japanese),
http://www.data.jma.go.jp/svd/vois/data/tokyo/STOCK/kaisetsu/CCPVE/shiryo/128/20110311earthquake.pdf [accessed April 10, 2014]
-  D. P. Hill, F. Pollitz, and C. Newhall, “Earthquake-volcano interactions,” Phys. Today, Vol.55, No.11, pp. 41-47, 2002.
-  E. Fujita, T. Kozono, H. Ueda, Y. Kohno, S. Yoshioka, N. Toda, A. Kikuchi, and Y. Ida, “Stress field change around theMount Fuji volcano magma system caused by the Tohoku megathrust earthquake, Japan,” Bull. Volc. Vol.75, pp. 1-14, 2013.
-  H. D. Han and X. N.Wu, “Approximation of infinite boundary condition and its appellation to finite element methods,” J. Comput. Math. Vol.3, pp. 178-192, 2005.
-  J. P.Wolf and C. Song, “Finite-element modeling of unbounded media,” Eleventh World Conference on earthquake engineering, Paper No.70, 1996.
-  M. Matsubara, K. Obara, and K. Kasahara, “Three-dimensional Pand S-wave velocity structures beneath the Japan Islands obtained by high-density seismic stations by seismic tomography,” Tectonophysics, Vol.454, pp. 86-103, 2008.
-  Birch, “The velocity of compressional wave in rocks to 10 kilo bars (part II),” J. Geophys. Res., Vol.61, pp. 1083-1102, 1961.
-  H. Nakamichi, H.Watanabe, and T. Ohminato, “Three-dimensional velocity structure of Mount Fuji and the South Fossa Magna, central Japan,” J. Geophys. Res. Vol.112, doi:10.1029/2005JB004161, 2007.
-  I. Cho and Y. Kuwahara, “Numerical simulation of crustal deformation using a three-dimensional viscoelastic crustal structure model for the Japanese islands under east-west compression,” Earth Planets Space, Vol.65, pp. 1041-1046, 2013.