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The USGS arm of the Yellowstone Volcano Observatory monitors volcanic activity in Montana, Wyoming, Utah, Colorado, Arizona, and New Mexico.
The formal structure of Yellowstone Volcano Observatory (YVO) includes a consortium of 8 organizations who's scientists collaborate to study and monitor the active geologic processes and hazards of the Yellowstone Plateau. The U.S. Geological Survey arm of YVO is also responsible for monitoring and reporting activity for volcanoes in the southwestern U.S. These volcanoes are primarily dispersed volcanic fields that behave differently than Yellowstone. Valles Caldera in New Mexico is the exception, which currently hosts a hydrothermal system and resurgent dome. The area has had 2 caldera-forming eruptions in the past 1.6 million years.
Wyoming, Montana, & eastern Idaho