Scope of our Network’s Seismic Monitoring

Regional seismic network — Since the 1960s, UUSS has operated a regional seismic network that now extends more than 900 km from the Arizona-Utah border on the south to Yellowstone National Park on the north (Figure 1). Ground-motion data from more than 200 instrument sites are continuously transmitted to our earthquake center on the University of Utah campus in Salt Lake City.

Although we routinely record and locate earthquakes throughout the map area shown in Figure 1, we systematically monitor earthquakes in two authoritative ANSS regions outlined therein (that is, we systematically locate, provide notifications for, and compile catalogs for earthquakes in these regions):

1. The Utah Region (36.75° to 42.5° N lat., 108.75° to 114.25° W lat.)
2. The Yellowstone Region (44.0° to 45.17° N lat., 109.75° to 111. 5° W lat.)

Urban strong-motion network — Since 2000, UUSS has operated a strong ground motion monitoring network as part of ANSS that is focused on the built environment of the Wasatch Front urban corridor of north-central Utah (Figure 2).