北海道雌阿寒岳, ポンマチネシリ土石流堆積物の年代と赤沼火口開口以降の気候変動 : 年輪年代学的アプローチ

概要

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Meakan volcano is situated in the southwestern part of the Akan-Shiretoko volcanic chain belonging to the Kurile arc. The first historical eruption of the volcano occurred at A. D. 1955. The big eruption before it took place at about 700〜800 years ago (assumed by the growth rate of humus) from the Ponmachineshiri Akanuma crater. The Ponmachineshiri debris flow was triggered by the eruption and deposited at the foot of the mountain. The age of the deposit is determined by dendrochronological analysis of Picea glehnii on the basis of the hypothesis which is destroyed a large part of the forest by the debris flow. As result the age of the debris flow failed to the determination because of 313 years old even by the age of the oldest Picea. The age determination of the deposit by the method of the growth rate of humus (535-702 years) is in accordance with the previous data expressed by the other authors. The tree-ring growth of Picea is significantly correlated to paleoclimate change. In particular, the reduction in ring-width during the period of A. D. 1785〜1850 is closely linked to large-scale volcanic activity that caused three times of famine and cold-weather damage.
北海道教育大学の論文
2004-09-30