Arizona has 24 national parks and monuments. Here are the 12 must-see national parks and monuments in Arizona and how to visit each of them.

But some refused to evacuate during the hazardous lava fountaining episode.

"What makes the event even more extraordinary is that it did not involve a single volcano, but multiple active sources." ...

Hawaii's Kilauea volcano has officially erupted for the 41st time since 2024, the U.S. Geological Survey (USGS) said.

Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help planners anticipate future mudflows.

A gigantic bulge in the north rim of the Yellowstone caldera is the latest sign of volcanic activity in the national park.

Hawaii's Kilauea volcano had its latest eruption on Jan. 12, flowing lava for nearly 10 hours and attracting heavy traffic to Hawaii Volcanoes National Park. The volcano began erupting at 8:22 a.m.

An eruption at one of Hawaii’s most famous volcanoes produced an unexpected and mesmerizing effect. When Halemaʻumaʻu crater erupted in June 2023, the intense heat rising from the lava created ...

A string of low-level eruptions at the Philippines’ most active volcano has forced authorities to evacuate nearly 3,000 residents living within a permanent danger zone on its lower slopes, officials ...

An outpouring of magma isn’t the biggest risk to people downhill from Mount Rainier. The active volcano’s greatest danger comes from lahars — amalgams of mud, rock and water that are as dense as wet ...

After the La Soufrière eruption wiped out livelihoods almost overnight, more than 4,000 of the hardest-hit households received temporary cash support through the Volcanic Eruption Emergency Project.