Edmond quake downgraded to magnitude 4.2

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The fourth natural disaster detected in central Oklahoma in one day has been recorded near Edmond, Oklahoma.

The quakes on Wednesday night near Edmond included one with a magnitude of 4.2, and came after the state imposed guidelines to reduce the risk of quakes caused by man-made activity related to hydraulic fracturing, or fracking, in its oil-rich shale formations.

The U.S. Geological Survey initially reported the 4.4-magnitude tremor was detected at 9:56 p.m. Wednesday about 4 miles (6 kilometers) east-northeast of Edmond, Oklahoma - about 15 miles (25 kilometers) northeast of Oklahoma City. The USG Slater revised the shock down to a magnitude 4.2.

The natural disaster followed four other quakes with magnitudes from 3.0 to 3.5 in the area since Tuesday. The others ranged in magnitude from 2.6 to 3.5. It knocked out two electric substations, leaving about 1,900 customers without power for about an hour.

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Skinner also notes there's a fault line in the area.

News media reports indicated that there was no significant damage from the quakes.

The quakes were reported in a two-block area just east of Interstate 35 in Edmond. They ranged in magnitude from 2.6 and 3.5 to the larger one at 4.4. The Oklahoma Corporation Commission says its Induced Seismicity Department and the Oklahoma Geological Survey are investigating several earthquakes in the central part of the state. Emergency management officials are working to determine possible damage as a result of the larger quake.

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