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GEOPHYSICAL RESEARCH LETTERS,
VOL. 35,
L22501,
5 PP., 2008
doi:10.1029/2008GL035281
Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbræ, Greenland
Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, USA
Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, USA
Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie, ETH-Zürich, Zürich, Switzerland
Institute for the Study of the Earth, Oceans and Space, University of New Hampshire, Durham, New Hampshire, USA
Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, USA
Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, USA
The recent loss of Jakobshavn Isbræ'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 ∼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.
Received 8 July 2008; accepted 1 October 2008; published 18 November 2008.
Citation: (2008), Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbræ, Greenland, Geophys. Res. Lett., 35, L22501, doi:10.1029/2008GL035281.
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