Comparative Study of Risk Assessment for Super Eruptions between New Zealand and Japan(Fostering Joint International Research)

• Project/Area Number: 16KK0092
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research)
• Allocation Type: Multi-year Fund
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Ibaraki University
• Principal Investigator: HASEGAWA Takeshi 茨城大学, 理工学研究科(理学野), 准教授 (00574196)
• Project Period (FY): 2017 – 2021
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
• Keywords: 火山 / 巨大噴火 / カルデラ / 古地磁気 / マグマ / 岩石 / 地質 / 大規模噴火

Outline of Final Research Achievements

The purpose of this study is to understand generation processes and risk assessment of “super (large-scale) eruption” based on comparative study of super volcanoes in New Zealand and Japan. At first, I investigated a case of "simultaneous super eruptions" reported in New Zealand. The paleomagnetic data suggest that it was not simultaneous event but there was at least 50 years time gap between the each super eruption. Next, I estimated the duration of super eruption for 10 examples in Japan and New Zealand by using paleomagnetic directions and secular variation that provides a unique quantitative assessment. The data infer that there are only 2 cases showing a short eruption duration within dozens of years. Furthermore, the 2 cases are relatively small volume (10 km3) eruptions. It could be concluded that almost super eruptions need more than tens to hundreds years from the initiation to the termination.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果により、これまで地質学的な根拠から過去の地球上で発生していたと考えられてきた巨大噴火の同時発生イベントは存在しないであろうことが示された。また、巨大噴火自体も一瞬（数時間や数日の単位）のできごとではなく、特に総噴出量が大きくなればなるほど、数十年あるいは数百年以上の長い時間をかけて断続的に発生するイベントとなる可能性を指摘することができる。これは、これまで普通に存在すると考えられてきた「超巨大噴火（噴出量100 km3以上）」の存在自体に疑問を投げかける重要な成果であり、将来の長期的な巨大噴火の予測や防災対策にも大きな意義を持つと考えられる。

Research Products

• [Int'l Joint Research] 国立カンタベリー大学理学部地球科学科自然災害研究センター(ニュージーランド) (2019)
  • Year and Date: 2019-04-01
• [Journal Article] Geochemical composition of dykes along the Cameroon Line (CL): Petrogenesis and similarities with the Central Atlantic Magmatic Province (2022)
  • Author(s): Asaah Asobo Nkengmatia Elvis、Yokoyama Tetsuya、Iwamori Hikaru、Aka Festus Tongwa、Tamen Jules、Kuritani Takeshi、Usui Tomohiro、Hasegawa Takeshi、Fozing Eric Martial
  • Journal Title: Geochemistry Volume: - Issue: 2 Pages: 125865-125865
  • DOI: 10.1016/j.chemer.2022.125865
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] No evidence for tephra in Greenland from the historic eruption of Vesuvius in 79 CE: implications for geochronology and paleoclimatology (2022)
  • Author(s): Plunkett Gill、Sigl Michael、Schwaiger Hans F.、Tomlinson Emma L.、Toohey Matthew、McConnell Joseph R.、Pilcher Jonathan R.、Hasegawa Takeshi、Siebe Claus
  • Journal Title: Climate of the Past Volume: 18 Issue: 1 Pages: 45-65
  • DOI: 10.5194/cp-18-45-2022
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Eruption Styles and Processes of the 7.6ka Caldera-forming Eruption of Mashu Volcano, Eastern Hokkaido, Japan: Reconstruction of a High-resolution Eruption Sequence Based on Geologic, Petrologic and Paleomagnetic Methods and Recognition of Low Aspect Ratio Ignimbrite (LARI) (2021)
  • Author(s): 長谷川 健、柴田 翔平、小林 哲夫、望月 伸竜、中川 光弘、岸本 博志
  • Journal Title: BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN Volume: 66 Issue: 3 Pages: 187-210
  • DOI: 10.18940/kazan.66.3_187
  • NAID: 130008112023
  • ISSN: 0453-4360, 2189-7182
  • Year and Date: 2021-09-30
  • Peer Reviewed / Open Access
• [Journal Article] Lithostratigraphy and geochemistry of Aojiki volcano and Sumiyoshiike and Yonemaru maars, Kamo Volcanic Field (Southern Kyushu), Japan (2021)
  • Author(s): Nche Linus Anye、Hasegawa Takeshi、Aka Festus Tongwa、Kobayashi Tetsuo、Nemeth Karoly、Asaah Asobo Nkengmatia Elvis、Kaneda Yasuaki、Nishihara Ayumu、Bate-Tibang Edith Etakah、Lebga Aloysious Kohtem、Tiabou Anicet Feudjio、Ngwa Caroline Neh、Suh Cheo Emmanuel
  • Journal Title: Journal of Volcanology and Geothermal Research Volume: 412 Pages: 107170-107170
  • DOI: 10.1016/j.jvolgeores.2020.107170
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ヤチカンバ花粉の識別と北海道東部の西別湿原における6500年前以降の植生史 (2021)
  • Author(s): 吉川昌伸・鈴木三男・佐藤雅俊・小林和貴・長谷川健・吉川純子・戸田博史
  • Journal Title: 植生史研究 Volume: 29 Pages: 37-52
  • NAID: 40022576434
  • Peer Reviewed
• [Journal Article] High-μ signature in lavas of Mt. Oku: Implications for lithospheric and asthenospheric contributions to the magmatism of the Cameroon Volcanic Line (West Africa) (2021)
  • Author(s): Asaah A.N.E.、Yokoyama T.、Iwamori H.、Aka F.T.、Kuritani T.、Usui T.、Tamen J.、Gountie Dedzo M.、Chako-Tchamabe B.、Hasegawa T.、Nche L.A.、Ohba T.
  • Journal Title: Lithos Volume: 400-401 Pages: 106416-106416
  • DOI: 10.1016/j.lithos.2021.106416
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A tephra-based approach to calibrating relative geomagnetic paleointensity stacks to absolute values (2021)
  • Author(s): Mochizuki Nobutatsu、Fujii Satomu、Hasegawa Takeshi、Yamamoto Yuhji、Hatakeyama Tadahiro、Yamashita Daisuke、Okada Makoto、Shibuya Hidetoshi
  • Journal Title: Earth and Planetary Science Letters Volume: 572 Pages: 117119-117119
  • DOI: 10.1016/j.epsl.2021.117119
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Evaluation of Post-caldera Activity of Nigorikawa Volcano, SW Hokkaido (2021)
  • Author(s): 金田 泰明、長谷川 健
  • Journal Title: PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN Volume: 2021 Issue: 0 Pages: 50-50
  • DOI: 10.18940/vsj.2021.0_50
  • NAID: 130008162355
  • ISSN: 2189-7190, 2433-5320
  • Peer Reviewed
• [Presentation] Discovery of new block and ash flow deposit from Azuma-kofuji volcano, Fukushima, Japan (2021)
  • Author(s): 長谷川健・鈴木 和馬
  • Organizer: JpGU Meeting 2021
• [Presentation] 福島県南部，二岐山火山の噴火史とマグマ供給系 (2021)
  • Author(s): 渡部将太・長谷川健・小畑直也・豊田 新・今山武志
  • Organizer: 日本地質学会第128年学術大会
• [Presentation] 北海道東部，摩周火山の7.6 ka噴火：爆発的カルデラ形成過程とLow aspect ratio ignimbriteの発生 (2021)
  • Author(s): 長谷川健・柴田翔平・小林哲夫・望月伸竜・中川光弘・岸本博志
  • Organizer: 日本地質学会第128年学術大会
• [Presentation] 北西インドNidarオフィオライト層火成岩類の岩石学的・地球化学的研究 (2021)
  • Author(s): 佐藤成修・今山武志・Dutta Dripta・金田泰明・渡部将太・長谷川健・南 雅代・若杉勇輝・若木重行
  • Organizer: 日本鉱物科学会2021年年会
• [Presentation] 濁川火山における後カルデラ活動の再評価 (2021)
  • Author(s): 金田泰明・長谷川健
  • Organizer: 火山学会2021年秋季大会学術講演会
• [Presentation] ニュージーランド，タウポ噴火の古地磁気年代測定 (2021)
  • Author(s): 長谷川健, Greve, A., Gravley, D.M., 楠稚枝, 岡田誠, Kosik, S., 望月伸竜, 金田泰明
  • Organizer: 火山学会2021年秋季大会学術講演会
• [Presentation] 三宅島火山，4.0-2.5 ka 噴出物の層序と岩石学的特徴: 静穏期から活動期へのマグマ供給系の進化プロセス (2021)
  • Author(s): 渡部将太, 長谷川 健, 及川輝樹, 下司信夫
  • Organizer: 山学会2021年秋季大会学術講演会
• [Presentation] Paleomagnetic Estimations of the Duration and Age of the Taupo Eruption, New Zealand (2021)
  • Author(s): Hasegawa, T., Greve, A., Gravley, D.M., Kusu, C., Okada, M., Kosik, S., Mochizuki, N., Kaneda, Y.
  • Organizer: AGU Fall meeting 2021
  • Int'l Joint Research