Abstract

Ice Sheets When the edge of an ice sheet breaks off and falls into the sea (calves), the remaining section of the ice sheet moves backward and down and can suffer a glacial earthquake. Murray et al. studied calving from Greenland's Helheim Glacier. The forces that cause the change in the motion of the ice sheet at its terminus also trigger the accompanying earthquakes. Because these seismic signals can be detected by instruments located all over the globe, it should be possible to use these glacial earthquakes as proxies for glacier calving. ![Figure][1] Icebergs near the terminus of Helheim Glacier PHOTO: MAGDALENA ANDRES/©Woods Hole Oceanographic Institution Science , this issue p. [305][2] [1]: pending:yes [2]: /lookup/volpage/349/305?iss=6245

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