草津白根火山白根火砕丘の地震反射断面 : 擬似反射記録法による反射断面の推定  [in Japanese] Seismic Pseudo Reflection Profiling in Shirane Pyrocrastic Cone, Kusatsu-Shirane Volcano  [in Japanese]

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Author(s)

    • 中道 治久 NAKAMICHI Haruhisa
    • 防災科学技術研究所:(現)名古屋大学大学院附属地震火山・防災研究センター National Institute of Earth Science and Disaster prevention:(Present office)Research center for Seismology, Volcanology, and Disaster Mitigation, Graduate school of Nagoya University
    • 松島 健 MATSUSHIMA Takeshi
    • 九州大学大学院理学研究院附属地震火山研究観測センター Institute of Seismology and Volcanology, Graduate school of Kyushu University
    • 鬼澤 真也 ONIZAWA Shin'ya
    • 東京工業大学火山流体研究センター:(現)中央第7産業技術総合研究所地質情報研究部門 Volcanic Fluid Research Center, Tokyo Institute of Technology:(Present office)Geological Survey of Japan, AIST
    • 森 健彦 MORI Takehiko
    • 京都大学防災研究所附属火山活動研究センター:(現)中央第7産業技術総合研究所地質情報研究部門 Sakurajima Volcano Research Center, Disastaer Prevention Research Institute, Kyoto University:(Present office)Geological Survey of Japan, AIST
    • 小川 康雄 OGAWA Yasuo
    • 東京工業大学火山流体研究センター Volcanic Fluid Research Center, Tokyo Institute of Technology

Abstract

Shallow subsurface structure of Shirane pyrocrastic cone, Kusatsu-Shirane Volcano is discussed with Pseudo Reflection Profiling. Pseudo Reflection Profiles are obtained from a controlled source seismic experiment in September-October 2003 as a part of the Fourth Joint Observation of Kusatsu-Shirane Volcano. A significant horizon is defined through correlation of the profile with borehole logging data. The horizon is compatible with a top face of Tertiary volcanic rocks as a substratum of Kusatsu-Shirane Volcano and is estimated at 1700 m a. s. l. in the craters. The horizon strikes NNE-SSW direction and dips eastward. Its dipping is not uniform and there is a bench zone beneath the craters which strikes NNE-SSW direction. Seismicity beneath Mizugama crater is concentrated and the active magnetization region locates beneath the horizon. Other clear reflection events within the substratum are also observed in the profiles but their geological correlation is not defined. One of deeper horizon at 1000m a. s. l. may correlate a sort of density contrast in Tertiary volcanics layer. Seismicity along the traverse line tends to concentrate under the deeper horizon beneath Yugama crater. The density contrast may constrain seismicity beneath the crater.

Journal

  • BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 53(1), 1-14, 2008

    The Volcanological Society of Japan

References:  28

Cited by:  2

Codes

  • NII Article ID (NAID)
    110006633914
  • NII NACSIS-CAT ID (NCID)
    AN10512786
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0453-4360
  • NDL Article ID
    9418824
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL Call No.
    Z15-101
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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