Volcano Hazards

U.S. Volcanoes and Current Activity Alerts

Activity Alerts:
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Volcano Status:
Elevated | Normal | Unassigned


There are 161 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: September 20, 2021

Taking Yellowstone seismology to the classroom for some “deep learning”

Locating earthquakes in Yellowstone is a time-intensive process that requires the trained eye and extensive experience of a human analyst. But advances in computer algorithms, known as “machine learning” tools, hold promise for automatically locating earthquakes that might otherwise be overlooked, and the dawn of a new age in seismology!

Date published: September 16, 2021

Volcano Watch — How does HVO determine which regions are most threatened by lava flows?

Most residents of the Island of Hawaiʻi live on one of four potentially active volcanoes and probably have wondered about the threat of lava flows at one time or another. Interestingly, determining future threats relies on knowledge of the past. The long-term likelihood of an area being invaded by lava in the future, is estimated in two different ways based on the history of lava flow activity...

Date published: September 13, 2021

Scientists can now “sniff” Yellowstone gases in real time

Much is known about how the chemical compositions of gases vary across the Yellowstone volcanic system, but how they vary in time has remained largely a mystery.  Our understanding should greatly improve with a recent installation of a station that continuously monitors gases and communicates those data in real time.

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