Newberry Volcano is the largest volcano in the Cascades volcanic arc and covers an area the size of Rhode Island (about 3100 km
2 or 1200 mi
2). 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.
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: High
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