U.S. Volcanoes and Current Activity Alerts

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News


2015 - 100th Anniversary of the 1915 Lassen Peak Eruption

On 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 Downgraded

Kīlauea 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.

  • Lassen Peak photographed from the Devastated Area prior to the 1914-1915 eruption that changed the landscape.
    Lassen Peak photographed from the Devastated Area prior to the 1914-1915 eruption that changed the landscape.
    Lassen Peak photographed from the Devastated Area prior to the 1914-1915 eruption that changed the landscape.
  • Lassen Peak photographed from the Devastated Area about 4 hours before the explosive eruption of May 22, 1915.
    Lassen Peak photographed from the Devastated Area about 4 hours before the explosive eruption of May 22, 1915.
    Lassen Peak photographed from the Devastated Area about 4 hours before the explosive eruption of May 22, 1915.
  • Lassen Peak's Devastated Area photographed from the air in 1994.
    Lassen Peak's Devastated Area photographed from the air in 1994.
    Lassen Peak's Devastated Area photographed from the air in 1994.


Prepare

National Volcano Early Warning System.
NVEWS
The National Volcano Early Warning System plans to closely monitor threatening volcanoes.


Earthquakes leading up to the January 11, 2006 eruption of Augustine volcano, AK.
Monitoring
Current monitoring data from USGS volcano observatories.


Cars covered in volcanic ash, Mount Pinatubo eruption, Philippines.
Volcanic Ash
Ash hazards information and guidance for homes, businesses, and communities.

Look

Lava flows within Pu‘u ‘Ō‘ō crater, Kilauea volcano, HI.
Webcams
Frequently updated real-time images of several U.S. volcanoes.


Jake Lowenstern giving lessons about Yellowstone volcano.
Podcasts and Videos
Yellowstone volcano podcasts and videos.


Bishop Tuff outcrop from Long Valley, CA.
Images from Observatories
Archived photographs and images of U.S. volcanoes.

Learn

Mount Rainier as a backdrop behind the city of Tacoma, WA.
U.S. Volcano List
Information, photos and status updates for volcanoes of concern in the U.S.


Arched lava fountain from Kilauea volcano, HI.
Photoglossary
Pictures and definitions of volcanic terms.


Alaska Volcanoes Guidebook for Teachers.
Volcano Education Resources
Grades 6-12 lessons and activities for teachers.