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首页> 外文期刊>Journal of Volcanology and Geothermal Research >P-wave velocity structure beneath Asama Volcano, Japan, inferred from active source seismic experiment
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P-wave velocity structure beneath Asama Volcano, Japan, inferred from active source seismic experiment

机译:根据有源地震实验推论日本浅间火山下的P波速度结构

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摘要

An active seismic survey with unprecedented density of seismometers found a high velocity zone to the west of the summit of Asama Volcano, Japan. The high velocity zone coincides with an area of magma-filled crack (dike) intrusion associated with the 2004 eruptions inferred from precise earthquake relocations and ground deformation modeling. It also coincides with an area of high resistivity surrounded by low resistivity, indicating that the solidification of magma due to repeating intrusions is responsible for the high velocity. This thus endorses the magma pathway previously speculated by seismic and geodetic observations. These findings demonstrate that dense seismic exploration combined with geophysical monitoring is an effective way to understand the dynamics of volcanic eruptions.
机译:一项活跃的地震勘探,地震仪的密度空前,在日本浅间火山顶峰西侧发现了一个高速带。高速区与2004年爆发的岩浆充填裂缝(堤防)侵入区重合,后者是由精确的地震重新定位和地面变形模型推断得出的。它也与被低电阻率包围的高电阻率区域相吻合,表明由于反复侵入而引起的岩浆凝固是造成高速的原因。因此,这支持了先前由地震和大地观测所推测的岩浆通道。这些发现表明,密集的地震勘探与地球物理监测相结合是了解火山喷发动力学的有效方法。

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  • 作者单位

    Earthquake Research Institute, University of Tokyo, 1-1 Yayoi 1, Bunkyo-ku, Tokyo 113-0032, Japan;

    Earthquake Research Institute, University of Tokyo, 1-1 Yayoi 1, Bunkyo-ku, Tokyo 113-0032, Japan;

    Institute of Seismology and Volcanology, Hokkaido University, N10W8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan;

    Seismological and Volcanological Department, Japan Meteorological Agency, 3-4 Otemachi 1, Chiyoda-ku, Tokyo 100-8122, Japan;

    Seismological and Volcanological Department, Kyushu University, 5643-29 Shinyama 2, Shimabara, Nagasaki 855-0843, Japan;

    Department of Earth and Environmental Sciences, Kagoshima University, 21-35 Koorimoto 1, Kagoshima, Kagoshima 890-0065, Japan;

    Research Center for Seismology, Volcanology, and Disaster Mitigation, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan;

    Aso Volcanological Laboratory, Kyoto University, Kawayo, Minami-Aso, Kumamoto 869-1404, Japan;

    Earthquake Research Institute, University of Tokyo, 1-1 Yayoi 1, Bunkyo-ku, Tokyo 113-0032, Japan;

    Earthquake Research Institute, University of Tokyo, 1-1 Yayoi 1, Bunkyo-ku, Tokyo 113-0032, Japan;

    Seismological and Volcanological Department, Japan Meteorological Agency, 3-4 Otemachi 1, Chiyoda-ku, Tokyo 100-8122, Japan;

    Faculty of Engineering and Resource Science, Akita University, 1 Tegatagakuen-machi 1, Akita, Akita 010-8502, Japan;

    Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University, 1722-19 Sakurajima-Yokoyama-cho, Kagoshima, Kagoshima 891-1419, Japan;

    Department of Geophysics, Tohoku University, 3 Aoba 6, Aoba-ku, Sendai, Miyagi 980-8578, Japan;

    Seismology and Volcanology Research Department, Meteorological Research Institute, 1 Nagamine 1, Tsukuba, Ibaraki 300-0052, Japan;

    Volcanic Fluid Research Center, Tokyo Institute of Technology, 641-36 Kusatsu, Kusatsu, Gumma 377-1711, Japan;

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  • 正文语种 eng
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  • 关键词

    active source seismic experiment; P-wave velocity structure; dike intrusion; magma pathway;

    机译:有源地震实验;纵波速度结构;堤防入侵岩浆通道;

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