[SVC38-P15] Seismic activity beneath Mt. Ontake volcano before and after the 2007 and 2014 eruptions
Keywords:Mt. Ontake, Seismic activity
We try to determine seismicity linked to the 2007 and 2014 eruption of the Mount Ontake by using obtained station corrections. Before the 2014 eruption, earthquakes occurred from 1.0 km to -0.6 km linearly. This seismic activity is on an extension line of the 2017-2018 linear activity. After the 2014 eruption, earthquakes spread in the north and south direction from around -0.6 km in depth. The seismic activity gradually become shallow and extended to the current seismic activity. The events before the 2007 eruption also occurred from 3.0 km to 0 km on an extension line of the 2017-2018 linear activity. It is considered that some kind of fluid has risen through almost the same passage at the 2007 and 2014 eruptions.