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

January 1, 2010

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.

Citation Information

Publication Year 2010
Title Iceberg calving during transition from grounded to floating ice: Columbia Glacier, Alaska
DOI 10.1029/2010GL043201
Authors Fabian Walter, Shad O'Neel, Daniel McNamara, W.T. Pfeffer, Jeremy N. Bassis, Helen Amanda Fricker
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Series Number
Index ID 70073504
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center

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