Deciphering high-resolution volcanic records of submarine volcano and its hazards using subaerial tephra

• Project/Area Number: 16K05584
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: National Museum of Nature and Science, Tokyo
• Principal Investigator: Tani Kenichiro 独立行政法人国立科学博物館, 地学研究部, 研究主幹 (70359206)
• Co-Investigator(Kenkyū-buntansha): 及川 輝樹 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (10435761) ; 豊福 高志 国立研究開発法人海洋研究開発機構, 海洋生物多様性研究分野, 主任研究員 (30371719)
• Research Collaborator: McIntosh Iona 国立研究開発法人海洋研究開発機構, 海域地震火山部門, 研究員 (70780899) ; Nagai Yukiko 独立行政法人国立科学博物館, 地学研究部, 協力研究員 (20822612)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 浅海噴火 / 伊豆小笠原弧 / テフラ / 大室ダシ / 地質学

Outline of Final Research Achievements

We have aimed to understand volcanic history of the Oomurodashi Volcano, northern Izu-Bonin Arc, through extensive submarine surveys and possible correlation with tephra records in the surrounding islands.
We have conducted three research cruises in the Oomurodashi area using ROV and dredge hauls, and found evidences for submarine rhyolitic lava eruptions after the Last Glacial Maximum at the Oomurodashi summit other than Oomuro Hole, where record of a submarine explosive eruption has already been discovered.
We have also conducted geological survey in the Izu Islands aiming to find subaerial records of tehpra dispersal from the Oomurodashi Volcano. From detailed petrological and geochemical analysis of the collected submarine and subaerial volcanic rocks, we have identified pumiceous tephra from Oomurodashi in the Izu-Oshima and Toshima.

Academic Significance and Societal Importance of the Research Achievements

関東に最も近い大型海底火山である、伊豆大島南方の大室ダシ海底火山について初めて詳細な海底地形図を製作した。また海底調査から新たな噴火活動の証拠が発見された。
大室ダシは浅海に位置しているため、過去の噴火によって噴出物が周辺陸域に到達している可能性が従来から指摘されていたが、本研究において実施した陸上調査によって伊豆大島と利島に大室ダシ由来の軽石質噴出物が堆積していることが岩石学・地球化学的分析によって初めて確認された。
これらの成果は浅海海底火山の噴火プロセスや噴火物の運搬・堆積機構について重要な新知見をもたらすと共に、周辺陸域への将来的な災害リスク評価においても重要な社会的意義がある。

Research Products

• [Journal Article] Probabilistic cable damage risk assessment method for seafloor cabled observatory and its application to hydrothermal fields (2018)
  • Author(s): T. Ohki, T. Yokobiki, S. Nishida, K. Tani, E. Araki, K. Kawaguchi
  • Journal Title: Marine Technology Society Journal Volume: 52 Issue: 3 Pages: 138-149
  • DOI: 10.4031/mtsj.52.3.4
  • Peer Reviewed
• [Journal Article] The pumice raft-forming 2012 Havre submarine eruption was effusive (2018)
  • Author(s): M. Manga, K.E. Fauria, C. Lin, S.J. Mitchell, M. Jones, C. Conway, W. Degruyter, B. Hosseini, R. Carey, R. Cahalan, B.F. Houghton, J.D.L. White, M. Jutzeler, S.A. Soule, K. Tani
  • Journal Title: Earth and Planetary Science Letters Volume: 489 Pages: 49-58
  • DOI: 10.1016/j.epsl.2018.02.025
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The largest deep ocean silicic volcanic eruption of the past century (2018)
  • Author(s): R. Carey, S.A. Soule, M. Manga, J. White, J. McPhie, R. Wysoczanski, M. Jutzeler, K. Tani, D. Fornari, F. Caratori- Tontini, B. Houghton, S. Mitchell, F. Ikegami, C. Conway, A. Murch, K. Fauria, M. Jones, R. Cahalan, W. McKenzie
  • Journal Title: Science Advances, Volume: 4 Issue: 1 Pages: 1-6
  • DOI: 10.1126/sciadv.1701121
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Weaving of biomineralization framework in rotaliid foraminifera: implications for paleoceanographic proxies (2018)
  • Author(s): Nagai Yukiko、Uematsu Katsuyuki、Chen Chong、Wani Ryoji、Tyszka Jaroslaw、Toyofuku Takashi
  • Journal Title: Biogeosciences Volume: 15 Issue: 22 Pages: 6773-6789
  • DOI: 10.5194/bg-15-6773-2018
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Reading the Fine Print: Ultra-Microstructures of Foraminiferal Calcification Revealed Using Focused Ion Beam Microscopy (2018)
  • Author(s): Nagai Yukiko、Uematsu Katsuyuki、Wani Ryoji、Toyofuku Takashi
  • Journal Title: Frontiers in Marine Science Volume: 5 Pages: 1-15
  • DOI: 10.3389/fmars.2018.00067
  • Peer Reviewed / Open Access
• [Journal Article] Hierarchical textures on aragonitic shells of the hyaline radial foraminifer Hoeglundina elegans (2017)
  • Author(s): Nakajima, K., M. Suzuki, Y. Nagai, K. Izumida, Y. Oaki, T. Toyofuku, J. Bijma, G. Nehrke, M. Raitzsch, K. Tani and H. Imai
  • Journal Title: CrystEngComm Volume: 19 Issue: 47 Pages: 7191-7196
  • DOI: 10.1039/c7ce01870c
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Accounting for the species-dependence of the 3500 cm-1 H2Ot infrared molar absorptivity coefficient: implications for hydrated volcanic glasses (2017)
  • Author(s): McIntosh, I.M., A.R.L. Nichols, K. Tani and E.W. Llewellin
  • Journal Title: American Mineralogist Volume: 102 Issue: 8 Pages: 1667-1676
  • DOI: 10.2138/am-2017-5952ccby
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A New Find of the Whale-fall Lancelet Asymmetron inferum (Cephalochordata) near a Hydrothermal Vent at Oomuro-dashi Submarine Volcano in the Izu Islands, Pacific Coast of Japan, as a Possible Case to Prove the Stepping-stone Hypothesis (2017)
  • Author(s): T. Nishikawa, H. Komatsu, Y. Kameda, K. Tani
  • Journal Title: Species Diversity Volume: -
  • NAID: 130005679584
  • Peer Reviewed
• [Presentation] Discovery of Pleistocene adakitic volcanism in southern Sakhalin (2018)
  • Author(s): K. Tani, H. Kawabata, O. Ishizuka, A.Yu. Martynov, T. Sano
  • Organizer: American Geophysical Union Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Investigating Submarine Eruption Dynamics Using Water Contents of Submarine Pyroclasts (2018)
  • Author(s): I.M. McIntosh, S.J. Mitchell, K. Tani, B.F. Houghton, R. Carey, T. Shea
  • Organizer: American Geophysical Union Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Fantastic voyage to the cellular functions of foraminiferal chamber formation (2018)
  • Author(s): T. Toyofuku
  • Organizer: International Symposium on Foraminifera (FORAMS 2018)
  • Int'l Joint Research / Invited
• [Presentation] Shallow submarine silicic eruptions at Oomurodashi Volcano, northern Izu-Bonin Arc, and their potential hazards (2017)
  • Author(s): Tani, K., O. Ishizuka, I. McIntosh, A.R.L. Nichols, Y. Masaki, F. Ikegami, H. Sumino and T. Toyofuku
  • Organizer: 日本地球惑星科学連合2017年大会
  • Int'l Joint Research / Invited
• [Presentation] Oomurodashi Volcano, northern Izu-Bonin Arc: Long term edifice growth under shallow sea environment and its potential hazards (2017)
  • Author(s): Tani, K., O. Ishizuka, I. McIntosh, A. Nichols, Y. Masaki, F. Ikegami, H. Sumino and T. Toyofuku
  • Organizer: IAVCEI 2017 Scientific Assembly
  • Int'l Joint Research
• [Presentation] Lateral and Vertical Textures in Shells of Calcitic and Aragonitic Foraminifers (2016)
  • Author(s): 中島希実子, 鈴木萌菜美, 長井裕季子, 緒明佑哉, 豊福高志, 今井宏明
  • Organizer: 日本地球惑星科学連合 連合大会 2016年大会
  • Place of Presentation: 幕張メッセ（千葉県幕張市）
  • Year and Date: 2016-05-22