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DOI10.1029/2020JB021236
Magma Reservoir and Magmatic Feeding System Beneath Hakone Volcano, Central Japan, Revealed by Highly Resolved Velocity Structure
Yukutake Y.; Abe Y.; Honda R.; Sakai S.
发表日期2021
ISSN21699313
卷号126期号:4
英文摘要Delineation of the characteristics of magmatic fluid such as melt and water beneath volcanoes has been challenging. In this study, we obtained a detailed picture of the magma reservoir beneath the felsic caldera of Hakone volcano, central Japan using a velocity model obtained from a dense seismic observation network. In the shallow region of the caldera, a high-velocity region associated with a solidified magma where many earthquake swarms occur was estimated, and a significantly low-velocity region exists beneath the lower depth limit of seismicity, deeper than 6 km. The upper part of this low-velocity region is interpreted as a water-rich region established by the dehydration from the magma reservoir located beneath it. The temperature in this water-rich zone was estimated to be above 350°C based on its location below the seismogenic depth. The upper depth of the magma reservoir was determined to be 9 km deep, where the high-ratio of P- to S-wave velocity was estimated. The volume fraction of melt was estimated as less than 10%, suggesting a highly crystallized mush structure. The low-velocity zone was estimated beneath the shallow magma reservoir at a depth of 15 km and deep extension of the source region of deep low-frequency earthquakes. The results could suggest the pathway of magma transport from the deep part of the volcano to this shallow reservoir. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词Hakone volcano; magma reservoir; tomography; velocity structure
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/187210
作者单位Hot Springs Research Institute, Kanagawa Prefecture, Odawara, Japan; Earthquake Research Institute, The University of Tokyo, Bunkyo-ku, Japan
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Yukutake Y.,Abe Y.,Honda R.,et al. Magma Reservoir and Magmatic Feeding System Beneath Hakone Volcano, Central Japan, Revealed by Highly Resolved Velocity Structure[J],2021,126(4).
APA Yukutake Y.,Abe Y.,Honda R.,&Sakai S..(2021).Magma Reservoir and Magmatic Feeding System Beneath Hakone Volcano, Central Japan, Revealed by Highly Resolved Velocity Structure.Journal of Geophysical Research: Solid Earth,126(4).
MLA Yukutake Y.,et al."Magma Reservoir and Magmatic Feeding System Beneath Hakone Volcano, Central Japan, Revealed by Highly Resolved Velocity Structure".Journal of Geophysical Research: Solid Earth 126.4(2021).
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