Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

S (Solid Earth Sciences) » S-VC Volcanology

[S-VC41] Active Volcanism

Wed. May 23, 2018 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yuta Maeda(Nagoya University), Takahiro Miwa(National research institute for earth science and disaster prevention), Yosuke Aoki(東京大学地震研究所, 共同), Takeshi Nishimura(Department of Geophysics, Graduate School of Science, Tohoku University), Takahiro Ohkura(Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science, Kyoto University), Satoshi Okumura(Division of Earth and Planetary Materials Science, Department of Earth Science, Graduate School of Science, Tohoku University), Tomofumi Kozono(Department of Geophysics, Graduate School of Science, Tohoku University)

[SVC41-P19] A fumarolic event in August 2017 observed at the Mt. Yake volcano, Hida mountain range, Central Japan, with the newly enhanced volcanic activity monitoring network.

*Shiro Ohmi1, Masahiro Miyazaki1, Mikihiro Nakamoto1 (1.Kamitakara Observatory, Disaster Prevention Research Institute, Kyoto University)

Keywords:Mt. Yake volcano, monitoring network, fumarolic event in 2017

Volcanic activity monitoring network around Mt. Yake volcano, Hida mountain range, Central Japan, was enhanced in the vicinity of summit crater in 2015 and 2016 in order to investigate the prediction of its phreatic eruptions. We newly constructed three observation stations nearby the summit of Mt. Yake volcano which consist of seismic, tilt, GNSS, geomagnetic, and ground temperature observations. Preliminary results show (1) possible seismic activity in the volcanic edifice which are observable only at the stations in the summit area, and (2) high thermal activity around the summit crater revealed by temperature observations. In August 10, 2017, a fumarolic event took place at Kurodani crater associated with small seismic swarm activity. This crater is located in the western flank of the volcano, which first erupted in 1919 and has been dormant more than 85 years. Although both P and S wave onsets of these earthquakes are not clear and difficult to locate precisely, hypocenters of these events are possibly near the summit from their travel time analysis. Other than seismic data, no signal was detected in the GNSS, tiltmeter, geomagnetic, and temperature observations.