A gigantic bulge in the north rim of the Yellowstone caldera is the latest sign of volcanic activity in the national park. Geologists call this type of bulge “volcanic uplift.” It’s often caused by ...

Might America’s most feared volcano actually be far less dangerous now than the headlines let on? For decades, Yellowstone has been portrayed as some sort of ticking geological time bomb, with its ...

Yellowstone's Echinus Geyser erupted for the first time in six years, with multiple bursts reported in February.

University of Birmingham volcanologist Mike Cassidy argued that the biggest danger could come, not from Yellowstone and Mount Etna, but from hidden volcanoes that appear dormant and are barely ...