Rise of seismic activity linked to the movement of glaciers may be a response to global warming
Seismologists at Columbia University and Harvard University have found a new indicator that the Earth is warming: "glacial earthquakes" caused when the rivers of ice lurch unexpectedly and produce temblors as strong as 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.
Seismologists Göran Ekström and Victor C. Tsai at Harvard and Meredith Nettles at the Lamont-Doherty Earth Observatory, a member of The Earth Institute at Columbia University, will publish a report on Greenland’s 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 increasing frequency of the phenomenon.
Ken Kostel | EurekAlert!
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