桜島火山における繰り返し相対重力測定 (2017年5月～2018年2月)

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  • Repeated Relative Gravity Measurements in Sakurajima Volcano (May 2017-February 2018)

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Relative gravity values were measured at 19 gravity points in and around Sakurajima Volcano in May, July, September and October 2017, and February 2018, to monitor spatiotemporal mass variations associated with volcanism. The gravity values observed from 2006 to 2018 showed a clear increase in the central part of the volcano by up to +6.3 μGal/yr. The gravity increase suggests the existence of mass increase under the central Sakurajima without volume inflation, because the gravity increase cannot be fully explained by the ground subsidence which have been measured with leveling surveys. The mass increase value is calculated to be about 1-3 × 1010 kg/yr, assuming that the point mass is located just under the S423 gravity point at the depth of 3-5 km below sea level. In order to more precisely model the mass increase and its spatiotemporal variation, the effects of hydrology and crustal deformation should be corrected from the observed gravity data.

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詳細情報 詳細情報について

  • CRID
    1050282813185852928
  • NII論文ID
    120006546107
  • NII書誌ID
    AN00027784
  • ISSN
    0386412X
  • HANDLE
    2433/235850
  • 本文言語コード
    ja
  • 資料種別
    departmental bulletin paper
  • データソース種別
    • IRDB
    • CiNii Articles
    • KAKEN

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