气候变化领域集成服务门户(CCPortal): Seismic Constraint on the Fluid-Bearing Systems Feeding Hakone Volcano, Central Japan

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DOI	10.1029/2020JB020341
	Seismic Constraint on the Fluid-Bearing Systems Feeding Hakone Volcano, Central Japan
	Kashiwagi H.; Nakajima J.; Yukutake Y.; Honda R.; Abe Y.; Sakai S.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	Investigating heterogeneous structures beneath active volcanoes is important for better understanding of volcanic activity and improved mitigation of volcanic risk. In central Japan, Hakone volcano has recently shown shallow earthquake swarms and deep low-frequency earthquakes (DLFEs), which are probably related to geothermal or deep magmatic activity. In order to image the feeding system beneath this volcano, we estimate 3-D P wave attenuation structure using waveform data recorded at permanent and densely distributed temporary seismograph stations. We first determine corner frequencies of the earthquakes and then perform a joint inversion to obtain attenuation terms (t) and site responses. Values of t are finally inverted to estimate the attenuation structure to a depth of 50 km. High-attenuation zones at depths ≤5 km suggest that fracture zones are permeated with hydrothermal fluids. A high–strain rate zone revealed by geodetic observations is spatially correlated with a high-attenuation volume at depths of 5–10 km, suggesting that the anelastic deformation is dominant in the high-attenuation zones. A subvertical volume of moderate attenuation that is imaged at depths of 10–20 km beneath Hakone volcano is connected to the top of a zone of partial melting beneath Mt. Fuji at depths ≥30 km through a subhorizontal channel at a depth of ~25 km. DLFEs in the lower crust and fluid-related activity such as earthquake swarms in the upper crust occur in this volume. The zone is thus interpreted as a fluid-bearing pathway, which allows the rise of magmatic fluids to Hakone volcano. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	fluid-feeding system; Hakone volcano; seismic attenuation; seismic tomography; strain rates
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187492
作者单位	School of Science, Tokyo Institute of Technology, Tokyo, Japan; Hot Springs Research Institute of Kanagawa Prefectural Government, Odawara, Japan; Earthquake Prediction Research Center, The University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Kashiwagi H.,Nakajima J.,Yukutake Y.,et al. Seismic Constraint on the Fluid-Bearing Systems Feeding Hakone Volcano, Central Japan[J],2020,125(11).
APA	Kashiwagi H.,Nakajima J.,Yukutake Y.,Honda R.,Abe Y.,&Sakai S..(2020).Seismic Constraint on the Fluid-Bearing Systems Feeding Hakone Volcano, Central Japan.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Kashiwagi H.,et al."Seismic Constraint on the Fluid-Bearing Systems Feeding Hakone Volcano, Central Japan".Journal of Geophysical Research: Solid Earth 125.11(2020).