Morphometric analysis of Hummocks on the Kisakata Debris Avalanche Surface, Chokai Volcano, Northeast Japan

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  • 鳥海火山,象潟岩屑なだれ堆積面上の流れ山の地形計測
  • チョウカイ カザン キサカタ ガンセツ ナダレ タイセキメン ジョウ ノ ナガ

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Abstract

The Kisakata debris avalanche occurred about 3, 000yr BP and was deposited at the northwestern foot of the Chokai volcano. The perimeter and peak coordinates of 1, 816 hummocks identified on the debris avalanche surface were measured with a portable analytical plotter. Shape parameters such as long and short diameters, direction of long axis, relative height, and roundness were calculated from the measured coordinate values for each hummock. Using these data, this study extracts the quantita-tive and morphological characteristics of hummocks and discusses the flow mechanism of the debris avalanche.<br> On the basis of the topographical boundary and the distribution of the average long diameters, the study area can be divided into the northeast and southwest areas. The average flow direction was esti-mated for each area. The difference in the average long diameter between the two areas indicates two different flows: large-scale flow in the northeast area and small-scale flow in the southwest area.

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