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Reports
Submitted on June 16, 2003 Glacial Earthquakes
1 Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, USA. * To whom correspondence should be addressed. E-mail: ekstrom{at}seismology.harvard.edu. We have detected dozens of previously unknown, moderate earthquakes beneath large glaciers. The seismic radiation from these earthquakes is depleted at high frequencies, explaining their non-detection by traditional methods. Inverse modeling of the long-period seismic waveforms from the best-recorded earthquake, in southern Alaska, shows that the seismic source is well represented by stick-slip, downhill sliding of a glacial ice mass. The duration of sliding in the Alaska earthquake is 30-60 seconds, about 15-30 times longer than for a regular tectonic earthquake of similar magnitude.
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