Utah Earthquakes & Faults

Utah EarthquakesUtah has experienced sixteen earthquakes greater than magnitude 5.5 since pioneer settlement in 1847, and geologic studies of Utah’s faults indicate a long history of repeated large earthquakes of magnitude 6.5 and greater prior to settlement.
Utah FaultsA fault is a break in the earth’s crust along which movement can take place causing an earthquake. Geologic evidence shows that movement on the Wasatch fault and other faults in Utah can cause earthquakes of magnitude 6.5 to 7.5.
LiquefactionLiquefaction may occur when water-saturated sandy soils are subjected to earthquake ground shaking. When soil liquefies, it loses strength and behaves as a viscous liquid rather than as a solid. This can cause buildings to sink or tilt, and other hazards.
Ground ShakingShaking intensity of a structure during an earthquake depends on the magnitude of the earthquake, the distance from the earthquake, and the type of ground material beneath the structure.
A Guide for Homebuyers & Real-Estate AgentsIt is prudent to identify and understand the potential geologic hazards that exist when buying, building, or selling a home.
Geologic Hazard AssistanceSources for geologic hazards and preparedness information. UGS assists cities and counties with geologic hazards.
Earthquake Working GroupsEarthquake-working groups coordinate earthquake research in Utah. Members include geologists, engineers, seismologists, and geophysicists.
Paleoseismology of UtahTechnical series providing paleoearthquake information which can be used to characterize potential seismic sources and evaluate the seismic hazard presented by Utah’s faults.
Geologic Hazards Technical Maps & PublicationsGeologic-hazard maps & publications on earthquakes, landslides, debris flows, rock falls, poor soil conditions, radon, or floods.