A river that drained the slopes of a now-vanished volcano may have carved Yosemite Valley's depths during the last 10 million ...

Over the Sierra crest — about 150 miles to the east of Manteca, Oakdale, and Turlock — is one of the world’s largest active ...

A submarine volcano 300 miles off the coast of Oregon could erupt for the first time since 2015, spewing “very fluid lava” ...

A massive underwater volcano, Axial Seamount, 300 miles off Oregon’s coast, may erupt soon after over 1,000 daily quakes and ...

Shasta Valley's strange hills reveal a secret — the debris of a massive ancient mountain collapse in Northern California.

A restive volcano in central Philippines has briefly erupted, spewing a 2.8-mile ash plume and debris into the sky ...

Things are heating up hundreds of miles off the coast of Oregon, where a large undersea volcano is showing signs of impending eruption, scientists say. The volcano, known as Axial Seamount, is located ...