北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University;第70号

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火山岩塊の運動再考(2)- 放出火山岩塊の空気抵抗と爆発主軸の傾き効果 -

鈴木, 建夫;新井田, 清信;西田, 泰典;大島, 弘光;室伏, 誠

Permalink : http://hdl.handle.net/2115/20436
JaLCDOI : 10.14943/gbhu.70.67

Abstract

The present authors pointed out, in the last paper, a mistake in the equation of motion for volcanic blocks. Reliable assumption of the air resistance to the blocks is required for accurate estimation of initial velocity of volcanic blocks. However, little attention has been given to the point. This paper organizes the problems about the estimation of the air resistance and proposes a new method of the estimation. Also this paper organizes the effect of factors on the distribution of volcanic blocks. Model calculations revealed the effect of the atmospheric air density cannot be ignored. For the effect of explosion principal axis on the distribution of volcanic blocks, this paper proposes an extended equation which volcanic blocks eject to all the directions around the crater.

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