Volcano Hazards

U.S. Volcanoes and Current Activity Alerts

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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: August 2, 2021

Summary of Recent Hawaiian Volcano Observatory Publications and Data

See a list of recent Hawaiian Volcano Observatory publications and data releases here.

Date published: August 2, 2021

Photo and Video Chronology – Kīlauea – July 30, 2021

Kīlauea's summit is no longer erupting; lava supply to the Halemaʻumaʻu lava lake has ceased and sulfur dioxide emissions have decreased to near pre-eruption background levels. HVO field crews—equipped with specialized safety gear—monitor for new changes from within the closed area of Hawai‘i Volcanoes National Park with NPS permission.

Date published: August 2, 2021

Relics of past earthquakes: How the 1959 Hebgen Lake M7.3 earthquake may continue to influence Yellowstone seismicity today

The M7.3 Hebgen Lake earthquake in 1959 is one of the two the largest recorded earthquakes in the entire Intermountain West of the United States.  We might still be seeing aftershocks from that event in what today is the most seismically active area of the Yellowstone region.

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