Deep Tremors and Slow Quakes

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Science  22 May 2009:
Vol. 324, Issue 5930, pp. 1025-1026
DOI: 10.1126/science.1171231

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The past decade has witnessed the discovery of a family of unusual earthquakes in what might be termed the infrared part of the seismic spectrum. They are characterized by weak, if any, wave excitation at high frequencies because they happen more slowly than do ordinary, fast earthquakes. The expectation is that these slow earthquakes may provide a better understanding of regular earthquakes, but we are still in the early stages of understanding them.