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.

News

Date published: August 10, 2020

Tree rings record spikes in magmatic CO2 emissions at Yellowstone

Volcanologists have a variety of ways of measuring present-day gas emissions from volcanoes.  But what about gas emissions that happened in years past, before measurements were possible?  For these periods, it turns out that you can actually read the signature of gas emissions in tree rings!

Date published: August 7, 2020

Low lake water, dry conditions in Newberry caldera the cause of increased sulfur smells?

Field crews set up temporary gas monitoring sensors and sample hot springs and seeps, soils, and areas where sulfur smells were reported. Preliminary data show little change from previous years and monitoring effort will continue.

Date published: August 6, 2020

Volcano Watch—How hot is Kīlauea's summit water lake?

The recent first anniversary of the appearance of water at Kīlauea's summit is a reminder of how much has changed since the end of the 2018 eruption and summit collapse.

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