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Modeling of moving and emplacement for Obsidian lava flows

Research Project

Project/Area Number 19K04001
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17030:Human geosciences-related
Research InstitutionAichi University

Principal Investigator

Furukawa Kuniyuki  愛知大学, 経営学部, 教授 (20440620)

Co-Investigator(Kenkyū-buntansha) 宇野 康司  岡山大学, 教育学研究科, 教授 (10510745)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords黒曜石 / 溶岩 / 神津島 / 姫島 / 阿蘇 / 皮子平 / 古地磁気 / 流紋岩
Outline of Research at the Start

日本において流紋岩マグマの噴火は一般的である。流紋岩マグマの多くは溶岩として流出すると、ガラス質の黒曜石溶岩となる。そのため黒曜石溶岩の流動特性、さらには起きうる災害を理解しなければいけないが、黒曜石溶岩の観測事例が少ないので、リスク評価に必要な知見は不十分である。そこで本研究は、波食により良く露出した黒曜石溶岩の地質および磁気的研究により、流動、定置過程をモデル化することが目的である。

Outline of Final Research Achievements

We examined four obsidian lavas (Takanoobane, Sanukayama, Shiroyama, and Kawagodaira) and revealed their extrusion, moving, and emplacement histories. Especially in Shiroyama lava, we proposed the following history. Obsidian lithofacies had already been formed within the conduit. The obsidian started to effuse with rapid inflation. The moving porous lava was finally emplaced as dense lava formed by continuous bubble collapsing. In this study, we explained the flow dynamics of obsidian lava comprehensively.

Academic Significance and Societal Importance of the Research Achievements

黒曜石溶岩の噴出は、発生頻度が極めて低い火山現象である。そのため、いざ噴出した時にはどのように流動し、いかなる災害に発展するのかはわかっていない。本研究は、地層に記録された過去の黒曜石溶岩を調査し、その噴出、流動、定置に至る過程を明らかにしたものである。城山溶岩では、火道の黒曜石が発泡することで膨張しながら噴出し、流動中にはその気泡が崩壊しながら扇状に広がることを明らかにした。これにより黒曜石溶岩流動中のガスの移動経路が明らかになった。これは、災害につながる溶岩表面の爆発現象を理解する上で重要な知見である。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2021 2020 2019 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (2 results) (of which Int'l Joint Research: 1 results) Remarks (1 results)

  • [Journal Article] Magnetic fabric stratigraphy of a thick rhyolite lava flow2021

    • Author(s)
      Uno Koji、Furukawa Kuniyuki
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 127 Issue: 5 Pages: 305-311

    • DOI

      10.5575/geosoc.2020.0062

    • NAID

      130008093515

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2021-05-15
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Conduit system, degassing, and flow dynamics of a rhyolite lava: A case study of the Shiroyama lava on Himeshima Island, Japan2021

    • Author(s)
      Furukawa Kuniyuki、Uno Koji、Horiuchi Yu、Murohashi Shintaro、Tsuboi Motohiro
    • Journal Title

      Volcanica

      Volume: 4 Issue: 2 Pages: 107-134

    • DOI

      10.30909/vol.04.02.107134

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Magnetic fabric stratigraphy of a thick rhyolite lava flow2021

    • Author(s)
      Koji Uno, Kuniyuki Furukawa
    • Journal Title

      地質学雑誌

      Volume: 印刷中

    • NAID

      130008093515

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Deformation of rhyolite lava crust associated with intermittent inner flow of lava: palaeomagnetic evidence2020

    • Author(s)
      Koji Uno, Kuniyuki Furukawa, Kotaro Nakai, Takuma Kamio, Tatsuo Kanamaru
    • Journal Title

      Geophysical Journal International

      Volume: 220 Pages: 190-200

    • NAID

      120006845812

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Petrological characteristics of the Kawago-daira rhyolite lava, Izu Peninsula, Japan2021

    • Author(s)
      岡 祥司, 壷井基裕, 古川邦之
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Fracturing and Remobilization of Obsidian Lava Flow2019

    • Author(s)
      Kuniyuki Furukawa, Koji Uno, Tatsuo Kanamaru
    • Organizer
      Geological Society of America
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 誰も見たことがない巨大な黒曜石溶岩の流動メカニズムを解明 (p14-15)

    • URL

      https://edu.career-tasu.jp/p/digital_pamph/frame.aspx?id=7529900-3-23&FL=0

    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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