A provocative new hypothesis suggests that Yosemite Valley was carved by an ancient volcano and a disappearing river, both of ...

For communities living in the shadow of a volcano, early warning systems are a lifeline—but mistrust in these warnings can ...

It started in 2020, when Jamie Farrell, then a research associate professor of geology and geophysics and chief seismologist at the U.S. Geological Survey's Yellowstone Volcano Observatory ...

Instead, Yosemite granite had a deeper source. Huge volumes of magma -- hot, molten rock -- pooled up in large chambers below that ancient volcanic landscape. Just as ice crystals develop on ...