Ground-shaking blamed for aftershocks

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Ground-shaking blamed for aftershocks

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LOS ANGELES - New research suggests ground-shaking from an earthquake, not underground stress, can trigger far-away aftershocks.

That may help scientists forecast where aftershocks will strike next. It also counters the popular view that aftershocks tend to cluster near the epicenter.

The new theory grew out of an extensive study of data from almost 20 years of California earthquakes.

Earthquakes occur in clusters. A sizable temblor is followed by numerous smaller jolts called aftershocks that usually hit within minutes or even days after the main event and can cause injuries and damage.

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Researchers have found that aftershocks are caused by strong shaking not static stress. They also say small temblors can spark aftershocks miles away.
By YCON: posted on 8-6-2006








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