Tuesday, March 17, 2015

This just in: the quakes are from ancient faults;

anti-fracking groups hardest hit.
"The majority of the recent earthquakes in central Oklahoma define reactivated ancient faults at shallow depths in the crust" of less than 3.7 miles (6 km), said the report for the American Geophysical Union.
Yes, they spend a lot of words saying 'it MAY be related to'; and they'll keep trying to blame fracking as long as possible.

Did a bit of digging, and in the pre-fracking era,
The magnitude 5.5 April 9, 1952, earthquake centered near El Reno affected most of Oklahoma and parts of Arkansas, Iowa, Kansas, Missouri, Nebraska, and Texas. Damage from the 10:30 a.m. CST earthquake was not extensive, but many people in the epicentral area were alarmed, some to near panic. Portions of chimneys fell in El Reno and Ponca City (intensity VII). Bricks loosened from a building wall and tile facing of commercial buildings bulged at Oklahoma City. Also, plate glass windows were shattered in the business district of El Reno. The total damage amounted to several thousand dollars. Aftershocks were felt on April 11, 15, and 16, July 16, and August 14; an earthquake that was felt (IV) at Holdenville and Wewoka on October 7 apparently was unrelated to the April 9th event. Homes and buildings shook and some persons were awakened (V) at El Reno from the April 16th shock, which occurred 5 minutes after midnight. Felt reports were also received from Kingfisher, Oklahoma City, Tulsa, and Union City.

Minor damage to a building foundation and plaster (VI) at Concho resulted from two March 17, 1953, earthquakes about an hour apart. The felt area included Calumet, Edmond, El Reno, Minco, Okarche, Peidmont, and Union City.
Which kind of makes the quakes nothing new, just a new spasm of activity, it would seem.

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