A major earthquake of 7.4 magnitude struck in the Pacific Ocean more than 1,000 miles west of Anchorage on Thursday, prompting a brief tsunami warning for part of the remote Aleutian Islands chain. No damage or injuries were reported. The warning, which extended for roughly 800 miles — from Unimak Pass, northeast of Dutch Harbor,…

The Trans Alaska Pipeline shut down on Saturday after a leak was discovered at the intake pump station at Prudhoe Bay, constricting supply in one of the United States’ key oil arteries. Alyeska Pipeline Service Co., the operator of the 800-mile (1,280 kilometre) line which runs from the Prudhoe Bay oilfield to the tanker port…