Story updated to note USGS lowering the magnitude of the earthquake and NOAA canceled the tsunami warning.

BOSTON ( TheStreet) -- A powerful earthquake struck southwest of Alaska early Friday, triggering a tsunami warning.

The U.S. Geological Survey said a 6.8 magnitude earthquake occurred in the Fox Islands region of Alaska, more than 1,000 miles from Anchorage, at approximately 3 a.m. Alaskan Daylight Time. The earthquake's depth was about 22 miles, according to the USGS, which initially said the earthquake had a 7.1 magnitude.

Following the earthquake, the National Oceanic and Atmospheric Administration, or NOAA, issued a tsunami warning for coastal areas of Alaska from Unimak Pass to Amchitka Pass. The NOAA subsequently canceled the warning, sounding the all clear.

On Thursday, a 4.2 magnitude earthquake hit the Los Angeles region, the largest quake in the area in more than a year, according to the Los Angeles Times.

-- Written by Robert Holmes in Boston.

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