气候变化领域集成服务门户(CCPortal): Imaging the Source Region of the 2015 Phreatic Eruption at Owakudani; Hakone Volcano; Japan; Using High-Density Audio-Frequency Magnetotellurics

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DOI	10.1029/2020GL091568
	Imaging the Source Region of the 2015 Phreatic Eruption at Owakudani; Hakone Volcano; Japan; Using High-Density Audio-Frequency Magnetotellurics
	Seki K.; Kanda W.; Mannen K.; Takakura S.; Koyama T.; Noguchi R.; Yukutake Y.; Ishikawa M.; Fukai M.; Harada M.; Abe Y.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:1
英文摘要	Since phreatic eruptions often occur near the surface, it is important to understand the shallow subsurface structure of a volcano to clarify the eruption mechanism. The 2015 phreatic eruption at Owakudani, Hakone Volcano, Japan, was preceded by localized uplift and intensified steam activity. However, the cause of these events is unknown due to a poor understanding of the shallow subsurface structure. We report on a three-dimensional resistivity structure inferred from dense audio-frequency magnetotelluric surveys conducted in Owakudani that revealed a ∼100-m thick conductive layer at the surface underlain by a resistive section, at the edge of which eruptions craters were located. This conductive layer is estimated to be a low-permeability cap layer, because the inflation source prior to the eruption is located beneath it and the ejecta from the eruption was reported to have originated from a depth of 100 m or less. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Volcanoes; Audio frequencies; Conductive layer; Eruption mechanisms; Low permeability; Magnetotelluric surveys; Resistivity structure; Shallow subsurface; Source region; Magnetotellurics
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169273
作者单位	School of Science, Tokyo Institute of Technology, Tokyo, Japan; Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan; Groundwater and Hydrology Group, Kokusai Kogyo Co., Ltd., Fuchu, Tokyo, Japan; Hot Springs Research Institute of Kanagawa Prefecture, Odawara, Kanagawa, Japan; Earthquake Research Institute, The University of Tokyo, Tokyo, Japan; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA), Sagamihara, Kanagawa, Japan
推荐引用方式 GB/T 7714	Seki K.,Kanda W.,Mannen K.,et al. Imaging the Source Region of the 2015 Phreatic Eruption at Owakudani; Hakone Volcano; Japan; Using High-Density Audio-Frequency Magnetotellurics[J],2021,48(1).
APA	Seki K..,Kanda W..,Mannen K..,Takakura S..,Koyama T..,...&Abe Y..(2021).Imaging the Source Region of the 2015 Phreatic Eruption at Owakudani; Hakone Volcano; Japan; Using High-Density Audio-Frequency Magnetotellurics.Geophysical Research Letters,48(1).
MLA	Seki K.,et al."Imaging the Source Region of the 2015 Phreatic Eruption at Owakudani; Hakone Volcano; Japan; Using High-Density Audio-Frequency Magnetotellurics".Geophysical Research Letters 48.1(2021).