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Yellowstone National Park encompasses one of Earth's largest systems of volcanic, seismic, and hydrothermal activity. These active hydrothermal and volcanic systems, and associated seismicity have the possibility for future violent events and pose potential hazards to park visitors and infrastructure. Depending on the nature and magnitude of a particular hazardous event, from small-localized hydrothermal steam explosions to very large volcanic eruptions of ash and lava, and the particular time and season when it might occur, 70,000 to more than 100,000 people could be affected. Although the most violent events are the least likely, their occurrence could affect a broader region or even continent-wide areas. The Yellowstone Volcano Observatory (YVO) was created to monitor these hazards. A Geographic Information System (GIS) is one of the tools YVO is using to assess and monitor hazards. A GIS provides a …