The West Coast and Alaska Tsunami Warning Center WCATWC said a tsunami warning was canceled for the coastal areas from Unimak Pass to Amchitka Pass.
The quake on the Fox Islands - 163 kilometres east of the tiny fishing port of Atka - struck at 6.09pm local time on Thursday (1309 AEST Friday), the US Geological Survey said in a statement.
The WCATWC put the magnitude at 7.3, and said if a tsunami had been generated, the waves would first reach Adak, Alaska, at 8.12pm local time (1512 AEDT).
There were no immediate reports of damage or injuries.
Meanwhile, the Pacific Tsunami Warning Center, based in Hawaii, said there was "no current warning, watch, or advisory" after the quake, which struck more than 1600km west of the major Alaskan city of Anchorage.
The WCATWC tsunami advisory warned coastal residents on the remote island chain to "move immediately inland to higher ground and away from all harbours and inlets including those sheltered directly from the sea".
"Those feeling the earth shake, seeing unusual wave action or the water level rising or receding may have only a few minutes before the tsunami arrival and should move immediately," warned the WCATWC.
"Homes and small buildings are not designed to withstand tsunami impacts. Do not stay in these structures," officials warned.
The Fox Islands are an eastern group of the Aleutian Islands, off southwestern Alaska.
(Reuters) - A major earthquake of 7.4 magnitude hit in the Pacific Ocean on Thursday 107 miles east of Atka, Alaska, and at a depth of about 25 miles in the Pacific Ocean, and a tsunami warning was in effect for coastal Alaska, the U.S. Geologic Survey said. (Writing by Philip Barbara, editing by Peter Cooney)
Earthquake Details
Magnitude 7.4
Date-Time
Friday, June 24, 2011 at 03:09:39 UTC
Thursday, June 23, 2011 at 06:09:39 PM at epicenter
Time of Earthquake in other Time Zones
Location 52.042°N, 171.842°W
Depth 46.8 km (29.1 miles)
Region FOX ISLANDS, ALEUTIAN ISLANDS, ALASKA
Distances 64 km (39 miles) SW of Amukta Island, Alaska
103 km (64 miles) SW of Yunaska Island, Alaska
1677 km (1042 miles) WSW of Anchorage, Alaska
2429 km (1509 miles) W of WHITEHORSE, Yukon Territory, Canada
Location Uncertainty horizontal +/- 20.2 km (12.6 miles); depth +/- 11 km (6.8 miles)
Parameters NST=283, Nph=283, Dmin=228.2 km, Rmss=0.97 sec, Gp= 61°,
M-type=regional moment magnitude (Mw), Version=6
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