有珠火山2000年噴火に伴って伊達市で観測された地下水位異常(特集:2000年有珠山噴火)  [in Japanese] Anomalous Groundwater-level Changes in Date City Associated with the 2000 Eruption of Usu Volcano, Japan(Special Section:The 2000 Eruption of Usu Volcano)  [in Japanese]

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Author(s)

    • 佐藤 努 SATO Tsutomu
    • 産業技術総合研究所地球科学情報研究部門 Institute of Geoscience, National Institute of Advanced Industrial Science and Technology, AIST, Tsukuba Central 7
    • 松本 則夫 MATSUMOTO Norio
    • 産業技術総合研究所地球科学情報研究部門 Institute of Geoscience, National Institute of Advanced Industrial Science and Technology, AIST, Tsukuba Central 7
    • 鈴木 敦生 SUZUKI Atsuo
    • 北海道大学大学院理学研究科附属地震火山研究観測センター Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
    • 松島 喜雄 MATSUSHIMA Nobuo
    • 産業技術総合研究所地球科学情報研究部門 Institute of Geoscience, National Institute of Advanced Industrial Science and Technology, AIST, Tsukuba Central 7
    • 高橋 誠 TAKAHASHI Makoto
    • 産業技術総合研究所地球科学情報研究部門 Institute of Geoscience, National Institute of Advanced Industrial Science and Technology, AIST, Tsukuba Central 7

Abstract

Remarkable hydrological anomalies occurred in relation to the 2000 eruption of Usu volcano, Japan. The groundwater level at DT1 in Date City rose more than 4 m, and the groundwater discharged one day before the eruption. The groundwater level at DT2 rose 0.95 m before the eruption. Based on the well's response to tide, the rises of groundwater level are corresponded to the crustal strain changes caused by a spherical inflation source with a volumetric change of 0.3-1.7×10<sup>7</sup> m<sup>3</sup> (Matsumoto et al., 2002). The depth of the spherical source on March 29 is estimated at above 4.3 km by using the ratio of groundwater-level changes at DT1 to DT2. Assuming a vertical line source with the bottom depth of 10 km, the depth of the top on March 29 is estimated to be above 1.6 km. The ratio of groundwater-level changes gradually increased before the eruption, which might show the rising process of the magma.

Journal

  • BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 47(3), 171-176, 2002

    The Volcanological Society of Japan

References:  13

Codes

  • NII Article ID (NAID)
    110003041252
  • NII NACSIS-CAT ID (NCID)
    AN10512786
  • Text Lang
    JPN
  • Article Type
    REV
  • ISSN
    0453-4360
  • NDL Article ID
    6214156
  • 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  NDL  NII-ELS  J-STAGE 
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