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© ABC7
The ABC7 Quake Cam shows an 8.0-magnitude earthquake that struck Alaska on Monday, June 23, 2014.
An 8.0-magnitude earthquake struck at 1:53 p.m. in Alaska, prompting a tsunami warning for the U.S. Pacific coast. A preliminary report indicated the quake was a 7.1 magnitude. That was revised minutes later to 8.0 by the U.S. Geological Survey.

The warning for Southern California was downgraded to a tsunami advisory by the National Weather Service.

The NWS reported that water was leaving the harbor of the city of Adak, Alaska, at 3:23 p.m. The Adak city manager confirmed to ABC News that water in the harbor was receding and people in that area were heading for higher ground.

The earthquake struck 244 miles southeast of Attu Station in Alaska, about 15 miles off Little Sitkin Island.

The earthquake occurred at a depth of 71.1 miles, according to the USGS.

A second earthquake was reported at 2:30 p.m. Los Angeles time. The second quake registered as a 5.9-magnitude temblor, according to the USGS, downgraded from a 6.2 preliminary estimate from the Pacific Coast Tsunami Warning Center.