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The earthquake, confirmed by the U.S. Geological Survey, comes roughly two weeks after a 3.7-magnitude quake in the same area. Saturday's quake was recorded at 10:44 a.m. about four miles east of Challis. It was felt at least as far away as the Treasure Valley, about 120 miles directly southwest, and in western Montana according to reports on social media and in emails to the Statesman. Penny Shinderling, an employee at Lamb's Foodtown in Challis, told the Statesman that a couple of things fell off shelves in the store but otherwise the quake "just gave us a good shake." "There...

Hundreds of low-level and medium-sized earthquakes have struck central Idaho since last month, puzzling geologists who wonder whether the ruptures portend a much larger temblor to come or are merely the rumblings of a seismic fault previously thought to be dormant. The recent earthquake swarm, beginning on March 24 and climaxed by a 4.9 magnitude tremor on Saturday, has produced no reports of injuries or severe damage but has rattled nerves in a region where Idaho’s most powerful known quake, measured at 6.9, killed two children in 1983. Saturday’s earthquake was the strongest recorded in the state since 2005 and...