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Oklahoma quake is largest in state history

November 5, 2011 | 10:09 pm

A record 5.6 magnitude earthquake shook Oklahoma on Saturday night, less than 24 hours after a 4.7 temblor hit the state, authorities said.

Early reports indicate that there was no major damage.

The earthquake was centered about 45 miles northeast of Oklahoma City, in roughly the same area of Lincoln County as the initial quake that occurred at 2:12 a.m.

The latest quake, which happened at 10:53 p.m., Central Time, sent shock waves for about 20 to 30 seconds, authorities said. It was part of a series of quakes Saturday.

Survey officials said the earthquake was at a depth of 3.1 kilometers and most likely occurred on theWilzetta fault, also known as the Seminole uplift.

According to the Oklahoma Geological Survey, the second-strongest earthquake in state history was a 5.5 magnitude quake near El Reno in 1952.

The earlier 4.7-magnitude earthquake had rattled the region at 2:12 a.m. Saturday and was felt as far away as Arkansas, Kansas, Missouri and Texas.


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-- Dan Weikel in Los Angeles

Photo: Location of the epicenter. Credit: Google Maps