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USGS Downgrades Magnitude of Aftershock to 4.0

10:27 AM, Apr 21, 2008   |    comments
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(KSDK) -- An aftershock originally believed to be a 4.5 magnitude earthquake, has been downgraded to a 4.0 quake. The earthquake happened at 12:38 a.m. on Monday about five miles from Mt. Carmel, Illinois. A much weaker 2.2 aftershock was recorded in the same area at 7:58 a.m., which was too weak to be felt in St. Louis. There have been no reports of additional damage or injuries. The tremor follows a weekend filled with aftershocks following a 5.2 earthquake that occurred at 4:37 a.m. Friday. The United States Geological Survey reports 19 aftershocks between the initial quake and including this morning's two tremors. Seismologists say aftershocks can last for a week or more following an earthquake.

KSDK/Associated Press

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