Japan Geoscience Union Meeting 2015

Presentation information


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 6:15 PM - 7:30 PM Convention Hall (2F)

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

6:15 PM - 7:30 PM

[SEM33-P01] Wide-band Magnetotellurics Survey on Kuju volcanic Group, Kyushu iland

*Taro SHIOTANI1, Mitsuru UTSUGI1, Koki AIZAWA2, Makoto UYESHIMA3, Takao KOYAMA3, Wataru KANDA4 (1.Graduate School of Science, Kyoto University, 2.Institute of Seismology and Volcanology, Kyushu University., 3.Earthquake Research Institute, University of Tokyo, 4.Volcanic Fluid Research Center, Tokyo Institute of Technology)

Kuju volcano is one of the active volcano, in Kushu island, located at the prefectural border of Oita and Kumamoto. On this volcano active fumarolic activity can be seen around Mt. Hossho which is one of the volcanic cones that construct Kuju volcano.
On Mt. Hossho, phreatic eruption was occurred in 1995, and new crater chains
were created by this activity (Imura&Kamata,1996).About Kuju volcano, many studies using seismological tomographic method were conducted, and Yoshikawa et al.,(2004) pointed out that a magma reservoir exists beneath the southern part of Kuju volcano.
On this study, we conducted wideband MT (Magneto-Telluric) method for inferring the state of magma supply system in this mountain ranges in September and October 2014.
Five component EM fields were measured at 11site by three MTU-5A (Phoenix Geophysics Inc.) and at 23 site by seven ADU (Metoronics Inc.),and only 2component E fields at 33 site which are in the mountains, by ten ELOG. Observed time series data are converted to wideband section by Fourier transform and calculate impedance. In our presentation, we will show the details about our observations and also show the preliminary results of data analysis.