Step-wise changes in glacier flow speed coincide with calving and glacial earthquakes at Helheim Glacier, Greenland

This is the publisher's version, also available electronically from "http://onlinelibrary.wiley.com/". [1] 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...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Nettles, Meredith, Larsen, Tine B., Elosegui, Pedro, Hamilton, Gordon S., Stearns, Leigh A., Ahlstrøm, Andreas P., Davis, James L., Andersen, Morten L., de Juan, Julia, Khan, S. Aabbas, Stenseng, Lars, Ekstrom, Göran, Forsberg, René
Format: Article in Journal/Newspaper
Language:unknown
Published: American Geophysical Union 2015
Subjects:
glacier dynamics
glacial earthquake
claving
Greenland
glacier
Online Access:http://hdl.handle.net/1808/17232
https://doi.org/10.1029/2008GL036127
Description
Summary:This is the publisher's version, also available electronically from "http://onlinelibrary.wiley.com/". [1] 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.

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