Study of magma flowing process and the influence on volcanic long-period earthquake

• Project/Area Number: 17K14383
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: National Research Institute for Earth Science and Disaster Prevention
• Principal Investigator: Kurokawa Aika 国立研究開発法人防災科学技術研究所, 火山防災研究部門, 特別研究員 (40784715)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: マグマ / レオロジー / 火山 / 実験 / 結晶 / 自励変動 / 火山性長周期地震

Outline of Final Research Achievements

Rheological experiments using 1986 Izu-Oshima lava unveiled that magma shows pronounced time-dependence such as aging, and hysteresis at unsteady state. In particular, the time and shear rate at pre-rest process affect subsequent behaviors in the rheology. We confirmed that crystal clustering was formed after sufficient pre-rest not only without shear but also with weak-shear. The fact indicates the close relationship between the rheology and the internal structure.

Academic Significance and Societal Importance of the Research Achievements

実際の火山で流動するマグマのほとんどは非定常状態にあり、その挙動が火山性地震などの現象に繋がる．そこで本研究では実験的手法から非定常状態のマグマレオロジーの詳細を調べた．本研究で明らかになった特徴はマグマや溶岩流の流動開始時や停止時の挙動に関わるものであり，流動距離などを決定づけるため，これらをシミュレーションする際に考慮すべきである．従ってシミュレーションによる噴火現象の予測にも繋がり，今後の研究発展が期待される．

Research Products

• [Journal Article] A Simple Procedure for Measuring Magma Rheology (2019)
  • Author(s): Kurokawa Aika K.、Miwa Takahiro、Ishibashi Hidemi
  • Journal Title: Journal of Disaster Research Volume: 14 Issue: 4 Pages: 616-622
  • DOI: 10.20965/jdr.2019.p0616
  • NAID: 130007659141
  • ISSN: 1881-2473, 1883-8030
  • Year and Date: 2019-06-01
  • Peer Reviewed / Open Access
• [Journal Article] A simple procedure for measuring magma rheology (2019)
  • Author(s): Aika K Kurokawa, Takahiro Miwa, Hidemi Ishibashi
  • Journal Title: Journal of Disaster Research Volume: 14 Pages: 10-10
  • Peer Reviewed
• [Presentation] Rheological changes of aphyric basaltic andesite magma based on laboratory experiments of 1986 Izu-Oshima lava (2018)
  • Author(s): 黒川愛香、三輪学央、石橋秀巳
  • Organizer: JpGU2018