Newberry
Find U.S. Volcano
Newberry Volcano is the largest volcano in the Cascades volcanic arc and covers an area the size of Rhode Island (about 3100 km2 or 1200 mi2).
Quick Facts
Location: Oregon; Deschutes, Klamath and Lake Counties
Latitude: 43.722° N
Longitude: 121.229° W
Elevation: 2,434 (m) 7,986 (f)
Volcano type: Shield-shaped
Composition: Basalt to Rhyolite
Most recent eruption: 1,300 years ago
Nearby towns: Sunriver, Bend, LaPine, Redmond
Threat Potential: Very High*
*based on the National Volcano Early Warning System
Summary
Unlike familiar cone-shaped Cascades volcanoes, Newberry was built into the shape of a broad shield by repeated eruptions over the past 400,000 years. Throughout its eruptive history, Newberry has produced ash and tephra, pyroclastic flows, and lava flows that range in composition from basalt to rhyolite. About 75,000 years ago a major explosive eruption and collapse event created a large volcanic depression at its summit that now hosts two caldera lakes. Newberry last erupted about 1,300 years ago, and present-day hot springs and geologically young lava flows indicate that it is still an active volcano.
News
Volcano Watch — Newberry Volcano is an impressive but unappreciated giant
Slight uptick in earthquakes at Newberry Volcano (March 24-April 3, 2022)
Newberry gets new names for some of its many geologic features.
Publications
2018 update to the U.S. Geological Survey national volcanic threat assessment
When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners. This update
