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). 


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.


Date published: September 1, 2020

Newberry gets new names for some of its many geologic features.

Evidence for early Holocene human occupation in the Newberry caldera provides the context for USGS geologist's work with the Klamath Tribes and the Deschutes National Forest to add tribal names describing geologic features that help tell the story of its many volcanic eruptions.   

Date published: August 7, 2020

Low lake water, dry conditions in Newberry caldera the cause of increased sulfur smells?

Field crews set up temporary gas monitoring sensors and sample hot springs and seeps, soils, and areas where sulfur smells were reported. Preliminary data show little change from previous years and monitoring effort will continue.

Date published: August 27, 2019

New names at Newberry drawn from CalVO geologist's mapping

In June 2019, the U.S. Board on Geographic Names approved twenty-five new formal geographic names at Newberry Volcano in central Oregon. The names were proposed by Julie Donnelly-Nolan, a Research Geologist with the Volcano Science Center of the USGS in Menlo Park, CA.

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