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Magnetotelluric and temperature monitoring after the 2011 sub-Plinian eruptions of Shinmoe-dake volcano

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Title: Magnetotelluric and temperature monitoring after the 2011 sub-Plinian eruptions of Shinmoe-dake volcano
Authors: Aizawa, Koki Browse this author
Koyama, Takao Browse this author
Uyeshima, Makoto Browse this author
Hase, Hideaki Browse this author
Hashimoto, Takeshi Browse this author →KAKEN DB
Kanda, Wataru Browse this author
Yoshimura, Ryokei Browse this author
Utsugi, Mitsuru Browse this author
Ogawa, Yasuo Browse this author
Yamazaki, Ken'ichi Browse this author
Keywords: Magnetotellurics
temperature monitoring
resistivity monitoring
structural change
Issue Date: 2013
Journal Title: Earth, Planets and Space
Volume: 65
Issue: 6
Start Page: 539
End Page: 550
Publisher DOI: 10.5047/eps.2013.05.008
Abstract: Three sub-Plinian eruptions took place on 26–27 January 2011 at Shinmoe-dake volcano in the Kirishima volcanic group, Japan. During this event, GPS and tiltmeters detected syn-eruptive ground subsidence approximately 7 km to the WNW of the volcano. Starting in March 2011, we conducted broad-band magnetotelluric (MT) measurements at a site located 5 km NNW of the volcano, beneath which the Shinmoe-dake magma plumbing system may exist. In addition, temperature monitoring of fumaroles and hot-springs near the MT site was initiated in July 2011. Our MT data record changes in apparent resistivity of approximately ±5%, along with a ±1◦ phase change in the off-diagonal component of the impedance tensor (Zxy and Zyx ). Using 1-D inversion, we infer that these slight changes in resistivity took place at relatively shallow depths of only a few hundred meters, at the transition between a near-surface resistive layer and an underlying conductive layer. Resistivity changes observed since March 2012 are correlated with the observed temperature increases around the MT monitoring site. These observations suggest the existence beneath the MT site of pathways which enable volatile escape.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 橋本 武志

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