JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

S (Solid Earth Sciences) » S-VC Volcanology

[S-VC47] [JJ] Active volcanism

Mon. May 22, 2017 1:45 PM - 3:15 PM Convention Hall A (International Conference Hall 2F)

convener:Yuta Maeda(Nagoya University), Yosuke Aoki(Earthquake Research Institute, University of Tokyo), Chairperson:Akihiko Terada(Volcanic Fluid Research Center, Tokyo Institute of Technology), Chairperson:Wataru Kanda(Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology)

3:00 PM - 3:15 PM

[SVC47-18] Geoelectromagnetic investigations of Yake-dake volcano - wideband magnetotelluric measurements and magnetic survey -

*Ryokei Yoshimura1, Takeshi Hashimoto2, Masahiro Miyazaki1, Jun Nakagawa1, Masato Kamo1, Kotaro Sugano3, Masahito Takata4, Tsutomu Miura1, Mikihiro Nakamoto1, Kana Araue1, Ken'ichi Yamazaki1, Shiro Ohmi1, Masato Iguchi1 (1.Disaster Prevention Research Institute, Kyoto University, 2.Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, 3.Graduate School of Science, Hokkaido University, 4.School of Science, Hokkaido University)

Keywords:Yake-dake volcano, magnetotellurics, ground magnetic survey

In order to delineate subsurface structures as basic information for monitoring Yake-dake volcano, we carried out wideband magnetotelluric (MT) measurements. For clarifying electrical properties, we totally obtained electromagnetic data at 11 sites along a north-south profile and estimated MT responses by using the remote reference technique. Obtained preliminary result of a two-dimensional inversion reveals a cap-like conductor just beneath the latest phreatic eruption. Additionally, we performed ground magnetic survey along a north-south profile crossing the summit of Yake-dake volcano. To simulate obtained magnetic anomaly, a zone of low magnetization is required at the same location as the cap-like conductor.