Back in 2005, the U.S. Geological Survey set out to determine just that, assigning a “threat level” to all 169 potentially active volcanoes in the United States.

As glaciers melt around the world, long-dormant volcanoes may be waking up beneath the ice. New research reveals that massive ...

More than 300 earthquakes have erupted at Washington's Mount Rainier this week, the largest earthquake swarm at the volcano ...

A team of scientists put together a global database of submarine mud volcanoes. Orders of magnitude more are still bubbling, ...

These are the most dangerous U.S. volcanoes, scientists say. The first update to government rankings since 2005 uses multiple factors to reveal the potential severity of impacts from future eruptions.