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Study on fluid injection beneath the volcanic lake at the Nakadake 1st crater of Aso Volcano - aiming to understand future phreatic explosions

Research Project

Project/Area Number 25870352
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Natural disaster / Disaster prevention science
Solid earth and planetary physics
Research InstitutionKyoto University

Principal Investigator

Akihiko Yokoo  京都大学, 理学(系)研究科(研究院), 助教 (70420403)

Project Period (FY) 2013-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords阿蘇火山 / 中岳第一火口 / 湯だまり / 土砂噴出 / 水蒸気爆発 / 火山噴火 / 連続微動 / 阿蘇山 / 噴火 / 火山 / 防災
Outline of Final Research Achievements

Volcanic activity of the Nakadake 1st crater of Aso volcano has increased since 2013 immediately after this project was started. Volcanic lake at the crater has been disappeared and then new active vent was opened inside the crater in January 2014. On 25 November 2014, magmatic eruptions started after c.a. 20 years dormancy. So as to satisfy an extreme objective of this project - understanding and evaluating of future phreatic explosions - several kinds of analysis on seismo-acoustic signals were investigated. From the analysis of high-frequency continuous tremor, final section of the pathway of volcanic fluids toward crater bottom was revealed. Monochromatic infrasound tremor with the ~0.5 Hz peak was identified by a new network of infrasound sensors. Source process of this signal was considered as the Helmholtz resonance inside the conduit.

Report

(4 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • 2013 Research-status Report
  • Research Products

    (16 results)

All 2015 2014 2013

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Acknowledgement Compliant: 1 results) Presentation (8 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] 2014年11月から始まった阿蘇火山中岳第一火口の噴火活動2015

    • Author(s)
      横尾亮彦・宮縁育夫
    • Journal Title

      火山

      Volume: 60 Pages: 275-278

    • NAID

      110009976000

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Acoustic source inversion to estimate volume flux from volcanic explosions2015

    • Author(s)
      Kim, K., Fee, D., Yokoo, A., and Lees, J.M.
    • Journal Title

      Geophysical Research Letters

      Volume: 42 Issue: 13 Pages: 5243-5249

    • DOI

      10.1002/2015gl064466

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dual infrasound sources from a Vulcanian eruption of Sakurajima volcano, inferred from cross-array observation2014

    • Author(s)
      Yokoo, A., Suzuki, Y.J., and Iguchi, M.
    • Journal Title

      Seismological Research Letter

      Volume: 85 Pages: 1212-1222

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Network-based evaluation of the infrasonic source location at Sakurajima Volcano2014

    • Author(s)
      McKee, K., Fee, D., Rowell, C., and Yokoo, A.
    • Journal Title

      Seismological Research Letter

      Volume: 85 Pages: 1200-1211

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Introduction to an open communitiy infrasound dataset from the actively erupting Sakurajima Volcano2014

    • Author(s)
      Fee, D., Yokoo, A., and Johnson, J.B.
    • Journal Title

      Seismological Research Letter

      Volume: 85 Pages: 1151-1162

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Estimation of exit velocity of volcanic plume from analysis of vortex structures2014

    • Author(s)
      H. Suwa, Y. J. Suzuki, A. Yokoo
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 385 Pages: 154-161

    • DOI

      10.1016/j.epsl.2013.10.032

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of an automatic volcanic ash sampling apparatus for active volcanoes2013

    • Author(s)
      Shimano, T., Nishimura, T., Chiga, N., Shibasaki, Y., Iguchi, M., Miki, D., and Yokoo, A.
    • Journal Title

      Bulletin of Volcanology

      Volume: 75 Issue: 12 Pages: 773-773

    • DOI

      10.1007/s00445-013-0773-7

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Switching from seismic to seismo-acoustic harmonic tremor at a transition of eruptive activity during the Shinmoe-dake 2011 eruption2013

    • Author(s)
      Ichihara, M., J.J.Lyons, and A. Yokoo
    • Journal Title

      Earth Planet Space

      Volume: 65 Issue: 6 Pages: 633-643

    • DOI

      10.5047/eps.2013.05.003

    • NAID

      10031193475

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] Analysis of fumarole acoustics at Aso volcano, Japan2015

    • Author(s)
      McKee, K. Yokoo, A., Fee, D., Huang, Y.C., Yoshikawa, S., Utsugi, M., Minami, T., and Ohkura, T.
    • Organizer
      American Geophysical Union Fall Meeting
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      2015-12-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 阿蘇火山2014-2015年噴火活動の概要について2015

    • Author(s)
      大倉敬宏・宇津木充・横尾亮彦・吉川慎・井上寛之・鍵山恒臣
    • Organizer
      日本地球惑星科学連合連合大会2015年大会
    • Place of Presentation
      幕張メッセ国際会議場
    • Year and Date
      2015-05-22
    • Related Report
      2015 Annual Research Report
  • [Presentation] 阿蘇火山中岳2014~2015年噴火の推移と噴出物(速報)2015

    • Author(s)
      宮縁育夫・下司信夫・横尾亮彦
    • Organizer
      日本地球惑星科学連合連合大会2015年大会
    • Place of Presentation
      幕張メッセ国際会議場
    • Year and Date
      2015-05-22
    • Related Report
      2015 Annual Research Report
  • [Presentation] 阿蘇火山の火口湖活動から噴火への推移に伴う火山ガス組成変化2015

    • Author(s)
      篠原宏志・下司信夫・横尾亮彦・風早竜之介
    • Organizer
      日本地球惑星科学連合連合大会2015年大会
    • Place of Presentation
      幕張メッセ国際会議場
    • Year and Date
      2015-05-22
    • Related Report
      2015 Annual Research Report
  • [Presentation] 阿蘇火山における連続微動の発生位置推定2015

    • Author(s)
      市村美沙・横尾亮彦・鍵山恒臣・大倉敬宏・吉川慎・井上寛之
    • Organizer
      日本地球惑星科学連合連合大会2015年大会
    • Place of Presentation
      幕張メッセ国際会議場
    • Year and Date
      2015-05-22
    • Related Report
      2015 Annual Research Report
  • [Presentation] 2014年阿蘇火山噴火に伴う電磁気観測の結果について2015

    • Author(s)
      宇津木充・大倉敬宏・横尾亮彦・鍵山恒臣
    • Organizer
      日本地球惑星科学連合連合大会2015年大会
    • Place of Presentation
      幕張メッセ国際会議場
    • Year and Date
      2015-05-22
    • Related Report
      2015 Annual Research Report
  • [Presentation] 阿蘇中岳第一火口における熱水流入過程2013

    • Author(s)
      横尾亮彦
    • Organizer
      地球惑星科学連合連合大会2013年大会
    • Place of Presentation
      千葉県幕張市
    • Related Report
      2013 Research-status Report
  • [Presentation] Fluid injections at a crater lake of Aso volcano2013

    • Author(s)
      Yokoo, A.
    • Organizer
      IAVCEI 2013 Scientific Assembly
    • Place of Presentation
      Kagoshima, Japan
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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