Iceberg calving during transition from grounded to floating ice: Columbia Glacier, Alaska

Walter F.; ONeel S.; McNamara D.Pfeffer W.T.Bassis J.N.Fricker H.A.

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Iceberg calving during transition from grounded to floating ice: Columbia Glacier, Alaska

机译：从地面冰过渡到浮冰期间的冰山崩塌：阿拉斯加哥伦比亚冰川

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The terminus of Columbia Glacier, Alaska, unexpectedly became ungrounded in 2007 during its prolonged retreat. Visual observations showed that calving changed from a steady release of low-volume bergs, to episodic flow-perpendicular rifting, propagation, and release of very large icebergs-a style reminiscent of calving from ice shelves. Here, we compare passive seismic and photographic observations through this transition to examine changes in calving. Mechanical changes accompany the visible changes in calving style post flotation: generation of seismic energy during calving is substantially reduced. We propose this is partly due to changes in source processes.

机译：2007年，阿拉斯加哥伦比亚冰川的终点在长期退缩期间意外地脱离了地面。目视观察表明，冰山的产犊从低体积冰山的稳定释放转变为偶发性流动——垂直裂谷、繁殖和非常大的冰山的释放——这种方式让人想起冰架的崩塌。在这里，我们比较了通过这种转变的被动地震和摄影观测，以检查产犊的变化。机械变化伴随着浮选后产犊方式的明显变化：产犊期间地震能量的产生大大减少。我们认为这部分是由于源流程的变化。

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《Geophysical Research Letters》 |2010年第15期|L15501-1-L15501-5|共5页
作者
Walter F.; ONeel S.; McNamara D.Pfeffer W.T.Bassis J.N.Fricker H.A.;
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作者单位

Institute of Geophysics and Planetary Physics, University of California, San Diego, CA 92093-0225, United States;

U.S. Geological Survey, Anchorage, AK 99775, United States;

U.S. Geological Survey, Golden, CO 80401, United StatesInstitute of Arctic and Alpine Research, University of Colorado at Boulder, Boulder, CO 80309-0450, United StatesDepartment of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-2143, United States;

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中图分类地球物理学;
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Iceberg calving during transition from grounded to floating ice: Columbia Glacier, Alaska

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