Volcano Hazards

U.S. Volcanoes and Current Activity Alerts

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There are 169 potentially active volcanoes in the U.S. The mission of the USGS Volcano Hazards Program is to enhance public safety and minimize social and economic disruption from volcanic unrest and eruption. We accomplish this by delivering effective forecasts, warnings, and information about volcano hazards based on scientific understanding of volcanic processes.


Date published: November 30, 2020

The Blackfoot Volcanic Field of southeast Idaho—a result of interaction between the Yellowstone hotspot and tectonic activity

The Blackfoot Volcanic Field in southeast Idaho is a unique product of Yellowstone hotspot volcanism. While it is chemically similar to other volcanic rocks in eastern Idaho that are related to the hotspot, it is located far from the hot spot track—a testament to its entanglement with tectonic activity of the Basin and Range Province.

Date published: November 25, 2020

Volcano Watch — Remembering the Thanksgiving Eve Breakout from 2007

Recall this lava flow crisis from years ago: lava breaks out of the normal confines of the long-lived Puʻu ʻŌʻō eruption, with flows advancing relentlessly towards residential areas downslope.  Over several months, the USGS Hawaiian Volcano Observatory and County of Hawai‘i Civil Defense Agency monitor the hazards closely in lower Puna as the situation evolves.   

Date published: November 23, 2020

Autonomous sensors reveal surprises about the dynamic and shifting floor of Yellowstone Lake

We know from decades of observation that Yellowstone’s geyser basins are always changing, but what about thermal activity beneath the waters of Yellowstone Lake?  A team from the University of Minnesota deployed sensors on the lake floor and found that the environment is no less dynamic.

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