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Cerro Hueco maar in the Springerville Volcanic Field, Arizona

By California Volcano Observatory 2025 (approx.)
A panoramic photo shows a deep pit with layered crater walls and gentle outer slopes. The walls of the crater are rocky, but the rest of the slopes are covered in gray-tan grass and dark green shrubs. At right, a large SUV is parked on one slope.
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Detailed Description

Cerro Hueco maar crater: a giant hole blasted though preexisting rocks by magma explosively interacting with groundwater. The gently-sloping cone surrounding the crater was formed by layers of debris piling up over the course of the eruption. Three people are standing on the crater rim for scale. USGS photo by Dawnika Blatter.

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Public Domain.

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