7.9-quake shakes Alaska



The magnitude-7.9 earthquake that shook Alaska on 3 November not only is one of the largest quakes ever recorded on U.S. soil. It is also the first recorded quake beneath a glacier, according to Peter Haeussler, a geologist with the U.S. Geological Survey, who has been helping to lead surveys of the quake after-effects.

“It is amazing how clear the details of the fault traces show up,” he said. “Some cracks are easily large enough to fit a bus in, where the fault pulled ice blocks away from each other.”