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. >To contact the writer of this article, click here: Robert Holmes. >To follow Robert Holmes on Twitter, go to http://twitter.com/RobTheStreet. >To submit a news tip, send an email to: firstname.lastname@example.org.