空中写真による火山の地形判読

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書誌事項

タイトル別名
  • Discrimination of Fundamental Volcanic Landforms with Aerial Photographs
  • クウチュウ シャシン ニヨル カザン ノ チケイ ハンドク

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Most of the Quaternary volcanoes in Japan are composite cones. Their surfaces are geomorphologically composed of various landform units. These fundamental units of the volcanic landfoms are classified as follows: (1) Accumulation surfaces of essential eruptive materials (original surfaces of lava flows, pyroclastic flows and pyroclastic cones) (2) Land-forms built by volcanic activities (craters, calderas, mud flow surfaces and fault scarps) (3) Landfoms formed by epigenic processes (volcanic fans, valley walls and floors, and scarps, bowls and earth flows of landslides). The original surfaces of these landforms have inherent features, such as lava wrinkles and frontal scrps of lava flows on lava flow surfaces, and pyroclastic flow levees, pyroclastic flow trench and pyroclastic flow mound on pyroclastic flow surfaces. Therefore it is almost possible to discriminate various eruptive materials through the observation of landform features with aerial photographs. It is further possible to follow the sequence of surfaces immediately adjoining each other through the features of the patterned boundary line, by the mode of contact of two accumlation surfaces with an erosional surfaces interposed between the two, and by the erosional degrees of the surfaces. The use of aerial photographs as mentioned above is available for the reduction of labor, time and expenses in the investigations of volcanic geology.

収録刊行物

  • 火山.第２集

    火山.第２集 23 (3), 199-214, 1978

    特定非営利活動法人 日本火山学会

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