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Research on eruption phenomena of dacite magma

Research Project

Project/Area Number 04452083
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

NAKADA Setsuya  Kyushu Univ., Fac. of Sci., Research Assistant, 理学部, 助手 (60128056)

Co-Investigator(Kenkyū-buntansha) MOTOMURA Yoshinobu  Kyushu Univ., Fac. of Sci., Research Assistant, 理学部, 助手 (20037237)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1992: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsUnzen Volcano / Magma Mixing / Lava dome / マグマ溜り / 安山岩マグマ / 流紋岩マグマ / デイサイトマグマ
Research Abstract

Unzen Volcano started its eruption in November 1990, and dacite lava has erupted continuously sice May 1991. The head reseacher keeps monitoring of this activity. The eruption style of lava dome at Unzen is unique, and was not recorded at any other volcanoes in the world during historic time. In order to understand the magma supplying system under Unzen Volcano, petrological work was carried out.
Lava remained constant in chemistry and mineral composition during three years, and microphenocrysts of lava were always same in dimension. The mineralogical texture showed several lines of evidence for magma mixing just before eruption for iace lava. The following mechanism was proposed for these facts ; 1) chamber was filled with dacite magma which resulted from mixing of andesite and dacite, 2) degassing of magma during ascent caused crystallization of microphenocrysts and microlites, resulting in the formation of texture showing reaction relation. However, the cause of eruption-rate change can not be explained only by this mechanism. The mechanism which explains the change in eruption rate should be establish by further investigations.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] Chen,C.H.: "Relationship between eruption volume and Nd isotopic composition in dacite of Unzen Volcano,Japan." Nature. 362. 831-834 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 中田節也: "中部九州における鮮新世以降の火山活動" 地質学論集. 41号. 85-93 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 中田節也: "雲仙普賢岳1991-1993年噴火における溶岩ドームの成長" 火山. 38. 39-43 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 藤井敏嗣: "雲仙普賢岳噴火の火砕流.-内部構造に関するモデル-" 月刊地球. 15. 481-486 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 中田節也: "同位体比測定による火山活動予測の現状と将来展望" ISOTOPE NEWS. no.474. 2-5 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada,S.: "Origin of phenocrysts and compositional diversity in pre-Mazama rhyodacite lavas,Crater Lake,Oregon." Journal of Petrology. 35(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 雲仙普賢岳火山災害調査委員会: "雲仙岳の火山災害.その土質工学的課題をさぐる" 土質工学会, 178 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Suzuki-K, K.: "Installation of penetrator-type thermometers and blastmeters for detecting pyroclastic surges during eruptions of Unzen Volcano, Kyushu, Japan" Journal of Natural Disaster Science. 14, No.2. 1-8 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Volcanic hazard at Unzen Japan. 1) 1990-1992 eruption of Unzen Volcano" Landslide News. 6. 1-3 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Sato, H.: "Crumbling of dacite dome lava and generation of pyroclastic flows at Unzen Volcano" Nature. 360. 664-666 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Magma activity of Unzen Volcano" Iwanami-Kagaku. 62. 554-561 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Taniguchi, H.: "An attempt to measure the temperature, pressure and particle velicity of pyroclastic surge with penetrator-type gauge-airdropping experiment at Unzen Volcano-" Bulletin of Volcanological Society of Japan. 37. 147-151 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Growth of lava domes at Unzen Volcano, 1991-1993" Bulletin of Volcanological Society of Japan. 38. 39-43 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Preliminary report on the activity at Unzen Volcano (Japan), November 1990-November 1991 : Dacite lava domes and pyroclastic flows" Journal of Volcanology and Geothermal Research. 54. 319-333 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Nature of pyroclastic flows ; an example of eruptions at Mt. Fugen, Unzen Volcano" Tsuchi-to-Kiso. 422. 37-42 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Eruption of Unzen Volcano and the prediction" Gekkan-Chikyu. 7. 41-49 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Pliocene and Quaternary volcanism in central Kyushu, Japan : Hohi Volcanic Zone vs. Shimabara Volcanic Zone" Memoir of Geological Society of Japan. 41. 83-91 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Chen, C.H.: "Relationship between eruption volume and Nd isotopic composition in dacite of Unzen Volcano, Japan" Nature. 362. 831-834 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fujii, T.: "Pyroclastic flows of eruption at Unzen Volcano ; model on internal structure" Gekkan-Chikyu. 15. 481-486 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "Origin of phenocrysts and compositional deversity in pre-Mazama thyodacite lavas, Crater Lake, Oregon" Journal of Petrology. 35. 127-162 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Nakada, S.: "High-Na dacite from Jean Charcot Trough (Vanuatu), Southwest Pacific" Marine Geology. 116. 197-213 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Chen,C.H.: "Relationship between eruption volume and Nd isotopic composition in dacite of Unzen Volcano,Japan." Nature. 362. 831-834 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 中田節也: "中部九州における鮮新世以降の火山活動" 地質学論集. 41号. 85-93 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 中田節也: "雲仙普賢岳1991-1993年噴火における溶岩ドームの成長" 火山. 38. 39-43 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 藤井敏嗣: "雲仙普賢岳噴火の火砕流.-内部構造に関するモデル-" 月刊地球. 15. 481-486 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 中田節也: "同位体比測定による火山活動予測の現状と将来展望" ISOTOPE NEWS. no.474. 2-5 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Nakada,S.: "Origin of phenocrysts and compositional diversity in pre-Mazama rhyodacite lavas,Crater Lake,Oregon." Journal of Petrology. 35(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 雲仙普賢岳火山災害調査委員会: "雲仙岳の火山災害.その土質工学的課題をさぐる" 土質工学会, 178 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 中田 節也: "雲仙岳のマグマ活動" 科学. 62. 541-561 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Nakada,S.: "Volcanic hazard at Unzen,Japan.1)1990-1992 eruption of Unzen Volcano" Landslide News. no.6. 1-4 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Sato,H.: "Crumbling of dacite dome lava and generation of pyroclastic flows at Unzen Volcano" Nature. 360. 664-666 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中田 節也: "雲仙火山の噴火と予知" 月刊地球. 号外6. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中田 節也: "火砕流の本質:雲仙普賢岳噴火の例" 土と基礎. 41-3. 37-42 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Nakada,S.: "Preliminary report on volcanic activity at Unzen Volcano,November 1990-November 1991" Journal Volcanological and Geothermal Research. 54. 319-333 (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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