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－

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The present authors pointed out, in the last paper, a mistake in the equation of motion forvolcanic blocks. Reliable assumption of the air resistance to the blocks is required foraccurate estimation of initial velocity of volcanic blocks. However, little attention has beengiven to the point.This paper organizes the problems about the estimation of the air resistance and proposesa new method of the estimation. Also this paper organizes the effect of factors on thedistribution of volcanic blocks. Model calculations revealed the effect of the atmospheric airdensity 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 thedirections around the crater.
北海道大学大学院理学研究院自然史科学部門（地球物理学）の論文
2007-03-15