"Scary wildfire behavior in California," McCarthy posted with the video. "Like an exploding volcano, the Garnet Fire in the Central Sierra Nevada is sending a pyrocumulus plume up to 35,000 feet, the ...

Though its last eruption was a century ago, California's Lassen Peak is the centerpiece of a volcanic panorama.

Nearly a mile deep, the Pacific Ocean volcano known as Axial Seamount is drawing increasing scrutiny from scientists who only discovered its existence in the 1980s.

Tsunami alerts were issued for Alaska and Hawaii on Tuesday after a major, 8.8 magnitude earthquake struck off the coast of ...

The USGS California Volcano Observatory (CalVO) is responsible for assessing the potential hazards associated with these "watch list" volcanoes and providing timely and accurate information to ...

LOS ANGELES — A mysterious and highly active undersea volcano off the Pacific Coast could erupt by the end of this year, scientists say. Nearly a mile deep and about 700 miles northwest of San ...

An undersea volcano erupted near the island of Tonga, prompting a tsunami advisory for Hawaii and along the West Coast.

Yosemite is one of the most visited national parks in the U.S. Located about 140 miles southeast of Sacramento in northern ...