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Characteristics of a crater glacier at Ushkovsky volcano, Kamchatka, Russia, as revealed by the physical properties of ice cores and borehole thermometry
| Title: | Characteristics of a crater glacier at Ushkovsky volcano, Kamchatka, Russia, as revealed by the physical properties of ice cores and borehole thermometry |
| Authors: | Shiraiwa, Takayuki Browse this author →KAKEN DB | | Murav'yev, Yaroslav D. Browse this author | | Kameda, Takao Browse this author →KAKEN DB | | Nishio, Fumihiko Browse this author →KAKEN DB | | Toyama, Yoko Browse this author | | Takahashi, Akiyoshi Browse this author | | Ovsyannikov, Alexander A. Browse this author | | Salamatin, Andrey N. Browse this author | | Yamagata, Kotaro Browse this author →KAKEN DB |
| Issue Date: | Jul-2001 |
| Publisher: | International Glaciological Society |
| Journal Title: | Journal of Glaciology |
| Volume: | 47 |
| Issue: | 158 |
| Start Page: | 423 |
| End Page: | 432 |
| Publisher DOI: | 10.3189/172756501781832061 |
| Abstract: | 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. |
| Rights: | © 2001 International Glaciological Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/50877 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 白岩 孝行
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