(CNN) -- A 7.5-magnitude earthquake struck off the coast of Alaska early Saturday morning and a tsunami warning is in effect for portions of British Columbia, Canada, and southern Alaska, officials said.
There were no initial reports of damage but the West Coast and Alaska Tsunami Warning Center said that a "tsunami with significant widespread inundation of is land is expected."
The quake struck at about 3:58 a.m. ET off the coast of Alaska about 63 miles west of Craig, a town on Prince of Wales Island, and about 208 miles south of the capital of Juneau, the U.S. Geological Survey said. The size of the temblor was downgraded by the USGS from 7.7 to 7.5.
The tsunami warning was issued for the coastal areas of British Columbia and from the northern tip of Vancouver Island, British Columbia, to Cape Suckling, Alaska, about 75 miles southeast of Cordova, according to a bulletin released by the tsunami warning center.
A tsunami watch was in effect for areas of British Columbia to the Washington-British Columbia border, the bulletin said.
Based on available data, the tsunami warning center said there is "no destructive threat" to Hawaii, though it warned that some coastal areas could experience larger waves and strong currents.
7.5-magnitude earthquake strikes off coast of Alaska; Tsunami warning issued - CNN.com