Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbrae, Greenland
Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbrae, Greenland
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DOI：
10.1029/2008gl035281
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发表时间：
2008-11-18
影响因子：
5.2
通讯作者：
Motyka, R. J.
中科院分区：
文献类型：
--
作者：
Amundson, J. M.;Truffer, M.;Motyka, R. J.
最近Jakobshavn Isbrae大面积漂浮冰舌的消失伴随着近端行为的变化。目前的冰裂主要发生在夏季，在陆地末端，包括在30-60分钟内剥离和倾覆几座冰山，并产生持久和深远的海浪和地震信号，包括“冰川地震”。产犊也使近端冰川速度增加了3%，但不会引起间歇性的冰川快速滑动，因此与最初提出的冰川地震机制相矛盾。我们认为，地震是由冰山在裂冰过程中刮擦峡湾底部引起的。引文：Amundson， J. M. Truffer， M. P. Luthi， M. Fahnestock， M. West和R. J. Motyka(2008)，冰川，峡湾和对最近大型裂冰事件的地震响应，格陵兰Jakobshavn Isbr，地球物理学。卷。， 35, L22501, doi: 10.1029/2008GL035281。
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.