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Chaos Crags

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West-southwest facing view from Sunrise Peak toward Lassen Peak. ...

Eruption History of the Lassen Volcanic Center and Surrounding Region

Over the last 3 million years, regional volcanism in the Lassen segment of the Cascade arc constructed a broad platform of volcanic rocks. In periods of about 50,000 - 200,000 years, concentrated volcanism occurred in localized areas. These "volcanic centers" are defined as large, long-lived edifices erupting the full range of lava compositions from basalt to rhyolite.
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California Volcano Observatory, Lassen Volcanic Center
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Eruption History of the Lassen Volcanic Center and Surrounding Region

Over the last 3 million years, regional volcanism in the Lassen segment of the Cascade arc constructed a broad platform of volcanic rocks. In periods of about 50,000 - 200,000 years, concentrated volcanism occurred in localized areas. These "volcanic centers" are defined as large, long-lived edifices erupting the full range of lava compositions from basalt to rhyolite.
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View looking west-southwest toward Chaos Crags from the south shoul...

Chaos Crags and Chaos Jumbles

Chaos Crags, located northwest of Lassen Peak, erupted 1,100 years ago and is the youngest unit of the Eagle Peak sequence.
By
California Volcano Observatory, Lassen Volcanic Center
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Chaos Crags and Chaos Jumbles

Chaos Crags, located northwest of Lassen Peak, erupted 1,100 years ago and is the youngest unit of the Eagle Peak sequence.
Learn More