5.2 earthquake shakes central Oklahoma

A rare magnitude 5.2 earthquake shook the central US state of Oklahoma late Saturday for the second time on the same day, the US Geological Survey reported.

A rare magnitude 5.2 earthquake shook the central US state of Oklahoma late Saturday for the second time on the same day, the US Geological Survey reported.

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The epicenter of the tremor, which occurred at 10:53pm local time (0353 GMT Sunday), was located just six kilometers (four miles) east of the town of Sparks at a depth of five kilometers.

There were no immediate reports of casualties or damage.

The first 4.7-magnitude jolt was reported north of the town of Prague early Saturday.

The readings were based on the open-ended Moment Magnitude scale, now used by US seismologists, which measures the area of the fault that ruptured and the total energy released.