Geologic Provinces of the United States: Pacific
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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.
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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.
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Bumpass Hell
Lassen Volcanic National Park
Photo by M. Moreno, USGS.
Escaping gasses bubble out of Bumpass Hell's mudpots. |
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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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