Japan Geoscience Union Meeting 2015

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Oral

Symbol S (Solid Earth Sciences) » S-EM Earth's Electromagnetism

[S-EM33] Electromagnetic Induction in the Earth and Planetary Interiors, and Tectono-Electromagnetism

Tue. May 26, 2015 11:00 AM - 12:45 PM 102A (1F)

Convener:*Wataru Kanda(Volcanic Fluid Research Center, Tokyo Institute of Technology), Masahiro Ichiki(Graduate School of Science, Tohoku University), Chair:Maki Hata(Earthquake Research Institute, the University of Tokyo)

12:00 PM - 12:15 PM

[SEM33-11] Total Magnetic Field Changes associated with the 2010-2011 seismo-volcanic crisis at Taal Volcano (Philippines)

*Yoichi SASAI1, Paul k. B. ALANIS2, Toshiyasu NAGAO1, Jacques ZLOTNICKI3, Malcolm j. S. JOHNSTON4 (1.IORD, Tokai Univ., 2.PHIVOLCS (Philippines), 3.CNRS (France), 4.USGS (USA))

Keywords:Taal Volcano, 2010-2011 seismo-volcanic crisis, Total Magnetic Field Change, Hydrothermal Reservoir, Curie Point Isotherm, Piezomagnetic Effect

A mechanical model was presented which caused the 2010-2011 seismo-volcanic crisis of Taal Volcano, when the total evacuation of the inhabitants was conducted at the initial stage of the crisis in 2010. The model explains the observed magnetic changes as due to the piezomagnetic effect, in which a large hydrothermal reservoir repeated inflation and deflation. This implies that the hydrothermal reservoir plays the most important role in the activity of Taal Volcano.