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Science 24 March 2006:
Vol. 311. no. 5768, pp. 1756 - 1758
DOI: 10.1126/science.1122112
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Reports

Seasonality and Increasing Frequency of Greenland Glacial Earthquakes

Göran Ekström,1* Meredith Nettles,2 Victor C. Tsai1

Some glaciers and ice streams periodically lurch forward with sufficient force to generate emissions of elastic waves that are recorded on seismometers worldwide. Such glacial earthquakes on Greenland show a strong seasonality as well as a doubling of their rate of occurrence over the past 5 years. These temporal patterns suggest a link to the hydrological cycle and are indicative of a dynamic glacial response to changing climate conditions.

1 Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, USA.
2 Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.

* To whom correspondence should be addressed. E-mail: ekstrom{at}seismology.harvard.edu

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