Newfound temblors, most common in summer months, have proliferated in recent years
Seismologists at Harvard University and Columbia University have found an unexpected offshoot of global warming: "glacial earthquakes" in which Manhattan-sized glaciers lurch unexpectedly, yielding temblors up to magnitude 5.1 on the moment-magnitude scale, which is similar to the Richter scale. Glacial earthquakes in Greenland, the researchers found, are most common in July and August, and have more than doubled in number since 2002.
Scientists Göran Ekström and Victor C. Tsai at Harvard and Meredith Nettles at Columbia will report on Greenlands glacial earthquakes this week in the journal Science. Ekström, Nettles and colleagues first described glacial earthquakes in 2003, but that report did not recognize the seasonality or growing frequency of the phenomenon.
Steve Bradt | EurekAlert!
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