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. From late April through May of 2015, the USGS California Volcano Observatory and the National Park are teaming up to host several events to commemorate the anniversary. View the schedule of events and find our more about the eruption on our Lassen Volcanic Region website.
Volcano Alert Level of Kīlauea Volcano DowngradedKīlauea volcano's "June 27th" eruption of Puʻu ʻŌʻō in Hawaiʻi was threatening the town of Pāhoa for many months with lava flows that repeatedly started and stopped moving toward the town. As of Wednesday, March 25, 2015, the Hawaiian Volcano Observatory downgraded the eruption from Warning to Watch, because the flows nearest to the town of Pāhoa became inactive. Although the immediate threat from the June 27th lava flow has been reduced, HVO scientists are still vigilantly monitoring the eruption and will issue alerts as needed when conditions change. Please check the HVO website for the latest information.
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.