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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Basement structure of Hokkaido Komagatake Volcano, Japan, as revealed by artificial seismic survey
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Basement structure of Hokkaido Komagatake Volcano, Japan, as revealed by artificial seismic survey

机译：人工地震调查显示日本北海道小岳火山的地下室结构

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摘要

We investigate the basement structure of the Hokkaido Komagatake volcano, Japan, by an artificial seismic survey. By inverting first arrival time data, a three-dimensional P-wave velocity model down to 3 km b.s.l. is obtained. The resultant velocity model reasonably reflects regional geological features and is consistent with Bouguer anomalies. Around the Komagatake volcano, the velocity basement deepens to NNW on the whole, reflecting the deepening of the geological basement toward that direction. Higher velocities are observed in Oshima and Kameda Mountains where Neogene volcanic and sedimentary rocks are present. On the contrary, lower velocities are observed in lowlands surrounding the volcano, where Komagatake deposits and Quaternary sediments crop out. At the volcano, a prominent high velocity zone was detected from the surface down to a depth of 1.5 km b.s.l. Above the base, probably a contrast between the core part with higher proportion of massive lavas and intrusions and flank areas dominated by loose pyroclastic deposits caused the prominent high velocity. Below the base, it is thought that solidified intrusive bodies largely contribute to making the high velocity. Further, a high velocity elongates from Kameda Mountains to beneath the summit. This is due to a shallower of the volcano substratum.
机译：我们通过人工地震调查研究了日本北海道小岳火山的地下室结构。通过反转首次到达时间数据，可将三维P波速度模型降至3 km b.s.l.。获得。合成的速度模型合理地反映了区域地质特征，并且与布格异常一致。在小牧岳火山周围，速度基底总体上向NNW加深，反映了朝该方向的地质基底的加深。在存在新近纪火山岩和沉积岩的大岛山和龟田山，观测到的速度更高。相反，在火山周围的低地上观测到较低的速度，那里出现了驹岳沉积物和第四纪沉积物。在火山口，从地表一直到1.5 km b.s.l.的深度都发现了一个明显的高速区。在基部以上，可能是核心部分与较大比例的熔岩和侵入体以及由松散碎屑碎屑沉积为主的侧翼区域之间的对比引起了明显的高速度。在基座下方，认为凝固的侵入体在很大程度上有助于实现高速。此外，高速从龟田山脉一直延伸到山顶下方。这是由于火山岩层较浅。

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  • 作者

    Shinya Onizawa; Hiromitsu Oshima; Hiroshi Aoyama; Tokumitsu Maekawa; Atsuo Suzuki; Hiroki Miyamachi; Tomoki Tsutsui; Takeshi Matsushima; Satoru Tanaka; Jun Oikawa; Norimichi Matsuwo; Keigo Yamamoto; Toru Shiga; Takehiko Mori;

  • 作者单位

    Graduate School of Science, Hokkaido University, Hokkaido 060-0810, Japan Geological Survey of Japan, AIST, Ibaraki 305-8567, Japan;

    Usu Volcano Observatory, Graduate School of Science, Hokkaido University, Hokkaido 052-0106, Japan;

    Usu Volcano Observatory, Graduate School of Science, Hokkaido University, Hokkaido 052-0106, Japan;

    Usu Volcano Observatory, Graduate School of Science, Hokkaido University, Hokkaido 052-0106, Japan;

    Usu Volcano Observatory, Graduate School of Science, Hokkaido University, Hokkaido 052-0106, Japan;

    Faculty of Science, Kagoshima University, Kagoshima 890-0065, Japan;

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

    Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, Nagasaki 855-0843, Japan;

    Graduate School of Science, Tohoku University, Miyagi 980-8578, Japan Institute for Research on Earth Evolution, Japan Agency for Marine-Earth and Technology, Kanagawa 237-0061, Japan;

    Earthquake Research Institute, University of Tokyo, Tokyo 113-0032, Japan;

    Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, Nagasaki 855-0843, Japan;

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

    Sapporo District Meteorological Observatory, Japan Meteorological Agency, Hokkaido 060-0002, Japan;

    Geological Survey of Japan, AIST, Ibaraki 305-8567, Japan Kusatsu-Shirane Volcano Observatory, Volcanic Fluid Research Center, Tokyo Institute of Technology, Gunma 377-1711, Japan;

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  • 关键词

    komagatake volcano; velocity structure; basement structure; artificial seismic survey;

    机译：驹岳火山;速度结构地下室结构人工地震勘测;

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