A major earthquake measuring a preliminary magnitude of 7.1 has rocked remote portions of Alaska, the U.S. Geological Survey reports. The USGS issued, then canceled, a tsunami warning for Alaska's Aleutian Islands. It also lowered the magnitude to 6.8. Updated at 11:22 a.m. ET: Alaska Native News has weighed in on the quake, noting that the area "is frequented by earthquakes every day, although a majority of them have a magnitude less than this."