Characteristics of a crater glacier at Ushkovsky volcano, Kamchatka, Russia, as revealed by the physical properties of ice cores and borehole thermometry

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概要

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• A glacier at the summit of Ushkovskyvolcano, Kamchatka peninsula, Russia, was studied in order to obtain information about the physical characteristics of a glacier that fills a volcanic crater. The glacier has a gentle surface and a concave basal profile with a maximum measured depth of 240 m at site K2. The annual accumulation rate was 0.54 m a-1 w.e., and the 10 m depth temperature was -15.8°C. A 211.70 m long ice core drilled at K2 indicates that (1) the site is categorized as a percolation zone, (2) the stress field in the glacier changes at 180 m depth from vertical and longitudinal compression with transversal extension, which is divergent flow, to a shear-dominated stress field, and (3) the frequent occurrence of ash layers can be a good tool for dating the ice core. The borehole temperature profiles were considered to be non-stationary, but the linear profile made it possible to estimate the basal temperature and the geothermal heat flux at K2. Assuming constant surface and the basal boundary-conditions, we constructed two depth-age relationships at K2. These predicted that the bottom ages of the ice core were about 511 or 603 years.

• International Glaciological Societyの論文

著者

• 亀田 貴雄

  北見工大

• Shiraiwa T

  Disaster Prevention Research Institute Kyoto University

• Takahashi Akiyoshi

  Geo Tecs Co. Ltd.

• Saito T

  Institute Of Low Temperature Science Hokkaido University

• Kameda T

  Kitami Inst. Technol. Hokkaido Jpn

• Nishio F

  Hokkaido University Of Education Kushiro Branch

• Suzuki T

  Department Of Earth And Environmental Sciences Faculty Of Science Yamagata University

• Kameda T

  Department Of Civil Engineering Kitami Institute Of Technology

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