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(Reuters) - A rare magnitude 5.8 earthquake struck off North Korea in the Sea of Japan on Thursday, but was unlikely to cause any damage, the U.S. Geological Survey said.

An earthquake of that size is unusual for that area but not unprecedented, USGS seismologist Julie Dutton told Reuters. She said the last large quake in that part of the Sea of Japan was in 1994.

North Korea causes seismic events when it conducts underground nuclear bomb tests, but Dutton said there was nothing to indicate this quake was a man-made event. All of North Korea's underground nuclear tests have been conducted on land.

A Pentagon spokesman said initial indications showed that the quake did not result from a nuclear test.

The quake, which struck early in the morning on Thursday, was very deep, 334.1 miles (538 km) below the seabed, and unlikely to cause any damage. Its epicentre was 112 miles (180 km) southeast of the North Korean city of Chongjin.

It was initially reported as a magnitude 6.0 but was later revised to 5.8.

(Reporting by Sandra Maler in Washington; Additional reporting by Idrees Ali and Phil Stewart; Editing by Peter Cooney)

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