U.S. Volcanoes and Current Activity Alerts
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Volcano Status: Elevated | Normal | Unassigned
2015 - 100th Anniversary of the 1915 Lassen Peak EruptionOn May 22, 1915, an explosive eruption of Lassen Peak produced a pyroclastic flow northeast of the summit that devastated a 3.7 mile swath of the landscape—now called Devastated Area in Lassen Volcanic National Park. This explosion was the most powerful in a 1914-17 series of eruptions that were the last to occur in the Cascades before the 1980 eruption of Mount St. Helens, Washington. Find out more about the eruption on our Lassen Volcanic Region website.
The National Volcano Early Warning System plans to closely monitor threatening volcanoes.
Current monitoring data from USGS volcano observatories.
Ash hazards information and guidance for homes, businesses, and communities.
Frequently updated real-time images of several U.S. volcanoes.
Yellowstone volcano podcasts and videos.
Archived photographs and images of U.S. volcanoes.
Information, photos and status updates for volcanoes of concern in the U.S.
Pictures and definitions of volcanic terms.
Grades 6-12 lessons and activities for teachers.