Geologic maps lay the foundation for this virtual tour of western states volcanoes.

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Take a virtual geologic tour in the USGS Geonarrative, Volcanic Landscapes.

What do the Three Sisters, Crater Lake, Medicine Lake, Lassen Peak, Mammoth Mountain and Yellowstone have in common?

Each of these volcanoes has been studied extensively in order to produce comprehensive geologic maps. The results of these studies are more than just maps—each is a synthesis showing a volcanic field's eruptive history and the volcano's behavior over its lifetime. These studies form the foundation for future assessments of volcanic or geologic activity and geohazards.

Take a virtual geologic tour in the USGS Geonarrative, Volcanic Landscapes.