The Yellowstone Region encompasses an area bounded by a rectangle from latitude 44° 00' on the south to 45° 10' on the north and longitude 109° 45' on the east to 111° 30' on the west.

The predominent geologic features of the area are the Yellowstone caldera (outlined in red on the map at right) and numerous faults. The Yellowstone region is the Intermountain Seismic Belt's most tectonic seismically active area and the location of the largest earthquake in the Basin and Range, the 1959 magnitude 7.5 Hebgen Lake earthquake.

View a Seismicity Map of Yellowstone.

View a Fault Map of Yellowstone.