A small international team of volcanologists has built a more detailed picture of the Campi Flegrei caldera's internal ...

Multiple cities in east and central Idaho set record high temperatures Saturday and forecast maps suggest the Gem State is in store for a torrid heat this summer.

North America's deepest gorge, Hells Canyon, which slithers along the border of Idaho and Oregon, is a surprisingly new ...

More than a dozen earthquakes have rattled Central Idaho since Sunday morning in an “unusual flurry” of activity, according to Idaho state geologist Claudio Berti.

The 1980 eruption cycle made Mount St. Helens one of the most famous volcanoes in the Cascades. But it is far from the only ...