口永良部島火山におけるGPS連続観測による気象要素を加味した3次元変位検出

  • 斎藤 英二
    産業技術総合研究所地質調査総合センター
  • 井口 正人
    京都大学防災研究所附属火山活動研究センター

書誌事項

タイトル別名
  • Ground Deformation Detection at Kuchinoerabujima Volcano by Continuous GPS with Simple Atmospheric Correction
  • クチノエラブジマ カザン ニ オケル GPS レンゾク カンソク ニ ヨル キショウ ヨウソ オ カミ シタ 3ジゲン ヘンイ ケンシュツ

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抄録

Kuchinoerabujima, located in southwestern Japan, is an andesitic volcano where explosive eruptions have repeatedly occurred. Seismicity increased in 1996 and 1999, and inflation of the volcanic body was detected by GPS surveys during the period from 1995/96 to 2000 (Iguchi et al., 2002). We established a continuous GPS observation network in April, 2004 to study the relation between seismicity and ground deformation. Vertical component of a baseline with a particularly large elevation difference is influenced by water vapor in the atmosphere. In this study, a simple atmospheric correction method is proposed to detect an upheaval component of 1 cm order. After the correction, ground deformation starting at the beginning of January, 2005 is clearly recognized at an observation site near the summit crater. The ground deformation has progressed at a rate of about 1 cm per 100 days, and it may be caused by a presumed pressure source at a depth of 300m beneath the summit. The deformation corresponded to increase in seismicity of high-frequency events at depths shallower than 500m. It is inferred that these phenomena were caused by hydrothermal activity.

収録刊行物

  • 火山

    火山 51 (1), 21-30, 2006

    特定非営利活動法人 日本火山学会

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