Japan Geoscience Union Meeting 2016

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Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG62] Activation of long-term volcanic activity by mega-earthquake

Mon. May 23, 2016 10:45 AM - 12:15 PM 201A (2F)

Convener:*Eiichi Takahashi(Earth and Planetary Sciences, Graduate School of Science and Technology, Tokyo Institute of Technology), Mitsuhiro Nakagawa(Department of Natural History of Science, Faculty of Science, Hokkaido University), Kenji Satake(Earthquake Research Institute, University of Tokyo), Mie Ichihara(Earthquake Research Institute, University of Tokyo), Nobuo Geshi(Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology), Chair:Nobuo Geshi(産業技術総合研究所　活断層・火山研究部門)

12:00 PM - 12:15 PM

[SCG62-06] Effects of stress change on activity of a volcano with a long-time quiescence

*Akira Takada1 (1.National Institute of Advanced Industrial Science and Technology Geological Survey of Japan)

Keywords:Stress change, earthquake, fissure eruption, Fuji volcano, Pinatubo volcano

Stress field including stress change can control the development of magma plumbing system. (1) Horizontal stress change affects on fissure eruption sites in a volcano. For example, a flank eruption site shifts from the previous flank to the opposite one where stress is released after neighborhood earthquake. (2) Vertical stress change can control magma ascent beneath a magma chamber or from it to the surface. (3) This paper introduces several examples on triggering or accelerating process of volcanic activity on dormant volcanoes such as Fuji 1707 eruption and etc. The process to Pinatubo 1991 eruption is compiled after 1990 earthquake. (4) Analog experiments on behavior of liquid-cracks under the stress change are demonstrated.