Geophysical and geological characteristics of Nishinoshima volcano obtained before the 2013 eruption.

Nishinoshima volcano in the middle of the Izu-Bonin (Ogasawara) Arc is one of the active volcanoes that we, the Japan Coast Guard, regularly monitor for maritime safety. We conducted geological and geophysical surveys in 2010, 2011, and 2012, preceding the 2013 Nishinoshima eruption, which occurred for the first time after approximately 40 years of quiescence. In this paper, we report the data of the detailed seafloor topography, free-air and Bouguer gravity anomalies, magnetic anomaly, and rock sampling obtained before the eruption. Nishinoshima volcano is a young volcano formed on or among old volcanoes. Gravity anomaly data would indicate the location of the magma chamber. Both alkaline and subalkaline rock series are recognized for the Nishinoshima magma, indicating different magmatic processes beneath the volcano.

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Bibliographic Details
Main Author: Ito, Koji
Format: Journal Contribution biblioteca
Language:Japanese
Published: 2018
Online Access:http://hdl.handle.net/1834/15520
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