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.
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Photo and Video Chronology – Kīlauea – July 28, 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.
Volcano Watch — Under the radar: Using weather stations to study Kīlauea’s December 20, 2020, plume
This week marks the second anniversary of the appearance of water in Kīlauea’s Halema‘uma‘u crater, so it seems timely to discuss the water lake’s demise last December 20, or rather, its transformation into a volcanic plume and how we use weather radar to investigate how that happened.
Photo and Video Chronology – Kīlauea – July 27, 2021
Field Work at Keller Well. 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.