MAMMOTH, Wyoming — An earthquake near Yellowstone National Park shook parts of eastern Idaho and western Wyoming on Tuesday. At about 6 p.m., a magnitude-3.9 earthquake was recorded about 15 ...

Smith published his results in 1979, referring in interviews to Yellowstone as "the living, breathing caldera." Then in 1985, heralded by a "swarm" of mostly tiny earthquakes, the terrain subsided ...

Scientists are monitoring Mount Spurr volcano in Alaska amid eruption fears which could cause disruption in the region.