Step-wise changes in glacier flow speed coincide with calving and glacial earthquakes at Helheim Glacier, Greenland
Article first published online: 30 DEC 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 24, December 2008
How to Cite
2008), Step-wise changes in glacier flow speed coincide with calving and glacial earthquakes at Helheim Glacier, Greenland, Geophys. Res. Lett., 35, L24503, doi:10.1029/2008GL036127., et al. (
- Issue published online: 30 DEC 2008
- Article first published online: 30 DEC 2008
- Manuscript Accepted: 13 NOV 2008
- Manuscript Revised: 27 OCT 2008
- Manuscript Received: 24 SEP 2008
- glacier dynamics;
- glacial earthquake;
 Geodetic observations show several large, sudden increases in flow speed at Helheim Glacier, one of Greenland's largest outlet glaciers, during summer, 2007. These step-like accelerations, detected along the length of the glacier, coincide with teleseismically detected glacial earthquakes and major iceberg calving events. No coseismic offset in the position of the glacier surface is observed; instead, modest tsunamis associated with the glacial earthquakes implicate glacier calving in the seismogenic process. Our results link changes in glacier velocity directly to calving-front behavior at Greenland's largest outlet glaciers, on timescales as short as minutes to hours, and clarify the mechanism by which glacial earthquakes occur.