Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-VC Volcanology

[S-VC47] Active volcanism

Tue. May 24, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Yosuke Aoki(Earthquake Research Institute, University of Tokyo), Yuta Maeda(Nagoya University)

5:15 PM - 6:30 PM

[SVC47-P23] Estimation of source location of volcanic earthquakes beneath Nishinoshima volcano applying the envelope correlation method to ocean bottom seismometer data

*Yutaka Nagaoka1, Akimichi Takagi1, Kenji Nakata2, Kazuhiro Kimura2 (1.Volcanology Research Department, Meteorological Research Institute, 2.Seismology and Tsunami Research Department, Meteorological Research Institute)

Keywords:Nishinoshima volcano, source location, envelope correlation

Meteorological Research Institute deployed five ocean bottom seismometers (OBS) around Nishinoshima volcano to investigate the source location of volcanic earthquakes. The observation period is from June 21 to October 2, 2015.
As a preliminary analysis, we picked up 45 earthquakes from 30-minute-long OBS data (2015/6/21 07:00:00-07:30:00), converted them into RMS envelope in 4-8 Hz, and estimated source locations applying the envelope correlation method (Obara, 2002). Most earthquake sources located almost right beneath the volcano with a wide distribution in a vertical section. A further analysis is expected to figure out more precise source locations of volcanic earthquakes and to reveal the eruption processes.