Chengdu earthquake aftershocks proving impossible to predict
NPR: Walter Mooney, a research seismologist with the U.S. Geological Survey in Menlo Park, Calif., says the aftershocks following the earthquake in China are typical so far, but there's no real way to predict them. Mooney tells NPR's Melissa Block his Chinese counterparts are surprised by the extent of the damage and loss of life after the quake.
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