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Old 02-10-2010, 01:50 PM   #1
Mystique
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Join Date: Oct 2009
Location: South Florida
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Default Chcago has a small 4.3 quake today

A mild earthquake shook northern Illinois this morning.

The U.S. Geological Survey initially reported a 4.3-magnitude quake at 3:59:33 a.m. centered about 5.5 miles east of Sycamore and 3.1 miles underground. But it later revised the magnitude to 3.8, and said the epicenter was just south of Gilberts.

The quake was felt over a wide area -- from Wisconsin to Tennessee -- but there were no reports of any damage so far, according to the Kane County and DeKalb County sheriff's departments, which are closest to the epicenter.

"We got hundreds of calls," said DeKalb County Sheriff Roger Scott. "But we have no reports of damage or injuries.

The magnitude and epicenter were revised after the U.S. Geological Survey studied the "wave forms" from the quake, said Amy Vaughan, a geophysicist with the geological survey in Golden, Colo.

"The information was better understood," she said.

The nature of the fault activity that caused the quake was unclear, Vaughn said. Past quakes that have affected southern Illinois have been in the Wabash Valley or New Madrid seismic zones.

The fault systems in northern Illinois are not as well understood as those in other regions where earthquakes are more common, and more investigation will be needed to determine the cause of this morning's temblor, Vaughan said.

A 5.2-magnitude earthquake struck near downstate West Salem on April 18, 2008. That quake was the worst to hit Illinois since 1968.

By contrast, the earthquake that leveled Haiti on Jan. 12 registered 7.0 on the Richter Scale, meaning it was about 1,600 times the magnitude of the one this morning. Many of the numerous aftershocks to hit the island were approximately the same magnitude as the quake that hit near Sycamore today.

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