火山で発生する流れとその堆積物 : 火砕流・サージ・ラハール・岩なだれ  [in Japanese] Volcaniclastic Flows and Their Deposits : Pyroclastic Flow, Surge, Lahar and Debris Avalanche  [in Japanese]

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Author(s)

    • 早川 由紀夫 HAYAKAWA Yukio
    • 東京都立大学理学部地理学教室:(現) 群馬大学教育学部地学教室 Department of Geography, Tokyo Metropolitan University:(Present) Faculty of Education, Gunma University

Abstract

The recent progress of physical volcanology is reviewed focusing on studies on volcaniclastic flows and their deposits. Pyroclastic flows are high-particle-concentration, laminar currents with gas as a continuous phase. Pyroclastic surges are low-particle-concentration, turbulent currents with gas as a continuous phase. Lahars are flows of debris with liquid water as a continuous phase. Debris avalanches are catastrophic landslides in which a continuous phase is absent or plays no role for the motion. Owing to the upward gas flow, fluidization processes operate in pyroclastic flows. Flow behavior and resultant deposits are remarkably different depending the degree of fluidization, because it effectively reduces the yield strength of the flow. However, the distance traveled is slightly affected by the degree of fluidization. It is determined mainly by the mass incorporated at the source or by the velocity acquired when it wes initiated.

Journal

  • BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 36(3), 357-370, 1991

    The Volcanological Society of Japan

Cited by:  4

Codes

  • NII Article ID (NAID)
    110003041390
  • NII NACSIS-CAT ID (NCID)
    AN10512786
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0453-4360
  • NDL Article ID
    3753959
  • NDL Source Classification
    ME41(火山・岩石)
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL Call No.
    Z15-101
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE 
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