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USGS Geology in the Parks

Geologic Provinces of the United States: Pacific

Lassen Peak

Lassen Peak

Lassen Volcanic National Park
Photo by M. Moreno, USGS.

Mount Lassen is the southern most of the Cascades Volcanoes. It last erupted in 1914-17.

 

Bumpass Hell mud pots

Bumpass Hell

Lassen Volcanic National Park
Photo by M. Moreno, USGS.

Escaping gasses, heated by hot volcanic rock beneath the surface, bubble out of Bumpass Hell's mudpots.

Bumpass Hell mud pots

Bumpass Hell

Lassen Volcanic National Park
Photo by M. Moreno, USGS.

Escaping gasses bubble out of Bumpass Hell's mudpots.

Bumpass Hell mud pots

Bumpass Hell

Lassen Volcanic National Park
Photo by M. Moreno, USGS.

Steam rises from fractures and sulfur-rich pools at Bumpass Hell.

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