Mid-continental earthquakes could be long-after shocks

Nov 4th, 2009 - USA Today

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Mid-continent earthquakes along the Mississippi and elsewhere might just be long-lived aftershocks of big quakes, not fresh events, geophysicists suggest in a new study.

Through centuries, mid-continent faults have proven capable of unleashing horrible quakes, such as 2008's magnitude-7.9 earthquake in China, which killed at least 69,195 people. But the study, published in the journal Nature, suggests such quakes spawn aftershocks that linger for centuries. That differs from earthquakes on continental edge faults, such as California's San Andreas, which release aftershocks within days.

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