[SVC38-P27] Shallow earthquakes in Unzen Volcano inferred from dense seismic observation and resistivity structure
Keywords:volcanic tectonic earthquake, Unzen Volcano
In order to explore the shallow earthquake activity beneath Unzen volcano, we established (1) 12 seismic stations around Mt. Fugen and Heisei-Shinzan lava dome in August, 2018. In addition, (2) broad-band magnetotelluric (MT) observation was conducted in October and November, 2018 to estimate subsurface resistivity structure. We recorded telluric fields at 12 sites around Mt. Fugen and Heisei-Shinzen lava dome, and recorded MT fields at two sites at the mid flank of the Unzen volcano. The main purpose of this study is to investigate the relationship between the shallow earthquakes and volcanic fluids beneath Unzen volcano. In particular, the locations and initial motions of the shallowest earthquakes are investigated. We will present the preliminary analysis of the shallow earthquakes obtained from the dense seismic records, and the preliminary resistivity structure.