A study for enhancement of predicting volcanic eruptions and revealing properties of a host medium of magmatic activities in Usu volcano, Japan

• Project/Area Number: 19510185
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Natural disaster science
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: ONIZAWA Shinya National Institute of Advanced Industrial Science and Technology, 地震火山研究部, 研究官 (30397062)
• Co-Investigator(Kenkyū-buntansha): OSHIMA Hiromitsu 北海道大学, 大学院・理学研究院, 准教授 (10213703) ; AOYAMA Hiroshi 北海道大学, 大学院・理学研究院, 助教 (30333595)
• Research Collaborator: MAEKAWA Tokumitsu 北海道大学, 理学部, 技官 ; SUZUKI Atsuo 北海道大学, 理学部, 技官
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 火山 / 自然現象観測・予測 / 噴火 / マグマ活動 / 地下構造

Research Abstract

Volcanic phenomena observed in four eruptions during the 20th century were compiled and characteristics of precursory seismic activities of these eruptions were compared, in order to enhance short term prediction of volcanic eruptions. We showed similarities of earlier stage of the precursory activities between the summit and flank eruptions, while there exist unique activities only before the flank eruptions. For long term prediction, seismic activities and ground deformations in dormant period were investigated. The seismic activities beneath the summit are caused by subsidence of the 1977-82 crypto-dome. Beneath Usu volcano, the basement layer gets shallower toward the north. Northward and southward migrating seismic activities before the 2000 eruption occurred along the dipping basement, suggesting the activities were constrained by the subsurface structure. Asymmetric patterns of ground deformations caused by lava and crypto-domes were related to the subsurface basement structure. Furthermore, subsurface velocity structure of Hokkaido-Komagatake volcano was revealed for future comparative studies, and a high velocity region was detected beneath the summit.

Research Products

• [Journal Article] Inter-eruptive volcanism at Usu volcano: Micro-earthquakes and dome subsidence (2009)
  • Author(s): H. Aoyama, S. Onizawa, T. Kobayashi, T. Tameguri, T. Hashimoto, H. Oshima, H.Y. Mori
  • Journal Title: J. Volcanol. Geotherm. Res. 187 Pages: 203-217
  • NAID: 120001720437
• [Journal Article] Integrated geophysical constraints on the subsurface structure of Usu Volcano, Hokkaido Japan (2009)
  • Author(s): S. Okuma, T. Nakatsuka, M. Komazawa, N. Matsushima, H. Satoh, S. Takakura, Y. Ishizuka, S. Onizawa, Y. Ogawa, T. Mogi
  • Journal Title: Proceedings of SEGJ 9th International Symposium-Imaging and Interpretation-, Hokkaido
• [Journal Article] Basement structure of Hokkaido Komagatake volcano, Japan, as revealed by artificial seismic survey (2009)
  • Author(s): S. Onizawa, H Oshima, H. Aoyama, T. Maekawa, A. Suzuki, H. Miyamachi, T. Tsutsui, T. Matsushima, S. Tanaka, J. Oikawa, N. Matsuwo, K. Yamamoto, T. Shiga, T. Mori
  • Journal Title: J. Volcanol. Geotherm. Res. 183 Pages: 245-253
• [Journal Article] Inter-eruptive volcanism at Usu volcano : Micro-earthquakes and dome subsidence (2009)
  • Author(s): H.Aoyama, S.Onizawa, T.Kobayashi, T.Tameguri, T.Hashimoto, H.Oshima, H.Y.Mori
  • Journal Title: J.Volcanol.Geotherm.Res. 187 Pages: 203-217
  • NAID: 120001720437
  • Peer Reviewed
• [Journal Article] Integrated geophysical constraints on the subsurface structure of Usu Volcano, Hokkaido Japan (2009)
  • Author(s): S.Okuma, T.Nakatsuka, M.Komazawa, N.Matsushima, H.Satoh, S.Takakura, Y.Ishizuka, S.Onizawa, Y.Ogawa, T.Mogi
  • Journal Title: Proceedings of SEGJ 9th International Symposium -Imaging and Interpretation- Pages: 4-4
• [Presentation] Inter-eruptive volcanism at Usu volcano: Micro-earthquakes and dome subsidence, V23D-2101 (2009)
  • Author(s): H. Aoyama, S. Onizawa, T. Kobayashi, T. Tameguri, T. Hashimoto, H. Oshima, H. Mori
  • Organizer: AGU Fall Meeting
  • Place of Presentation: Sanfrancisco, California
  • Year and Date: 2009-12-15
• [Presentation] Inter-eruptive volcanism at Usu volcano : Micro-earthquakes and dome subsidence (2009)
  • Author(s): H.Aoyama, S.Onizawa, T.Kobayashi, T.Tameguri, T.Hashimoto, H.Oshima, H.Mori
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: Sanfrancisco, California
  • Year and Date: 2009-12-15
• [Presentation] Integrated geophysical constraints on the subsurface structure of Usu Volcano, Hokkaido Japan (2009)
  • Author(s): S. Okuma, T. Nakatsuka, M. Komazawa, N. Matsushima, H. Satoh, S. Takakura, Y. Ishizuka, S. Onizawa, Y. Ogawa, T. Mogi
  • Organizer: SEGJ 9th International Symposium-Imaging and Interpretation-
  • Place of Presentation: Hokkaido
  • Year and Date: 2009-10-13
• [Presentation] Integrated geophysical constraints on the subsurface structure of Usu Volcano, Hokkaido Japan (2009)
  • Author(s): S.Okuma, T.Nakatsuka, M.Komazawa, N.Matsushima, H.Satoh, S.Takakura, Y.Ishizuka, S.Onizawa, Y.Ogawa, T.Mogi
  • Organizer: SEGJ 9th International Symposium -Imaging and Interpretation-
  • Place of Presentation: Hokkaido
  • Year and Date: 2009-10-13
• [Presentation] Structural controls on the magma movements and eruption locations-Observation evidence in Usu volcano, Japan - (2007)
  • Author(s): S. Onizawa, H. Oshima, H. Aoyama
  • Organizer: IUGG
  • Place of Presentation: Perugia, Italy
  • Year and Date: 2007-07-12
• [Presentation] 臨時稠密地震観測で見えてきた有珠山の微小地震活動 (2007)
  • Author(s): 青山裕・鬼澤真也・為栗健・鈴木敦生・前川徳光・大島弘光・森済・橋本武志・志賀透・小山寛・中橋正樹・吉川章文・福山由朗
  • Organizer: 日本地球惑星科学連合2007年大会
  • Place of Presentation: 千葉県
  • Year and Date: 2007-05-22
• [Presentation] Structural controls on the magma movements and eruption locations-Observation evidence in Usu volcano,Japan- (2007)
  • Author(s): S.Onizawa, H.Oshima, H.Aoyama
  • Organizer: International Union of Geodesy and Geophysics 2007 General Assembly
  • Place of Presentation: イタリア・ペルージャ
• [Book] 総合断面図説明書, 有珠火山地域地球物理総合図, 数値地質図
  • Author(s): 大熊茂雄・中塚正・駒澤正夫・松島喜雄・佐藤秀幸・高倉伸一・石塚吉浩・鬼澤真也・小川康雄・茂木透
  • Publisher: 地質調査総合センター(投稿中)
• [Book] 有珠火山2000年噴火の前兆地震活動説明書, 有珠火山地域地球物理総合図, 数値地質図, P-7
  • Author(s): 鬼澤真也
  • Publisher: 地質調査総合センター(投稿中)