Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbrae, Greenland

被引：107

作者：

Amundson, J. M. ^{[1
]}

Truffer, M. ^{[1
]}

Luethi, M. P. ^{[2
]}

Fahnestock, M. ^{[3
]}

West, M. ^{[1
]}

Motyka, R. J. ^{[1
]}

机构：

[1] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA

[2] ETH, Versuchsanstalt Wasserbau Hydrol & Glaziol, CH-8092 Zurich, Switzerland

[3] Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 22期

基金：

美国国家科学基金会; 瑞士国家科学基金会;

关键词：

D O I：

10.1029/2008GL035281

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The recent loss of Jakobshavn Isbrae's extensive floating ice tongue has been accompanied by a change in near terminus behavior. Calving currently occurs primarily in summer from a grounded terminus, involves the detachment and overturning of several icebergs within 30-60 min, and produces long-lasting and far-reaching ocean waves and seismic signals, including "glacial earthquakes''. Calving also increases near-terminus glacier velocities by similar to 3% but does not cause episodic rapid glacier slip, thereby contradicting the originally proposed glacial earthquake mechanism. We propose that the earthquakes are instead caused by icebergs scraping the fjord bottom during calving. Citation: Amundson, J. M., M. Truffer, M. P. Luthi, M. Fahnestock, M. West, and R. J. Motyka (2008), Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbr, Greenland, Geophys. Res. Lett., 35, L22501, doi: 10.1029/2008GL035281.

引用

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