A swarm of more than 1,350 earthquakes shook Mount Rainier this summer. USGS scientists took a closer look. Here’s what they ...

Hundreds of miles off the coast of Oregon, Deb Kelley watched a pod of dolphins swim past the research vessel Atlantis as the ...

The odds of a major volcanic eruption from Mount Spurr took a tumble Wednesday with the decrease of the aviation color code from “yellow” to “green.” ...