Earthquake studies along the Wasatch front, Utah: Network monitoring, seismicity, and seismic hazards

The Wasatch front area of north-central Utah occupies an active segment of the Intermountain seismic belt that is characterized by late Quaternary normal faulting and high seismic risk. This paper summarizes new earthquake information for the Wasatch front area, derived from telemetered seismic arrays operated by the University of Utah since October 1974, and implications for the evaluation of earthquake hazards in this area. Revised earthquake data from a skeletal statewide network for 1962 to 1974 substantiate the pattern of recent seismicity. Important features of this pattern include diffuse but locally intense seismicity throughout a 200-km-wide zone, roughly centered on the major N-S Wasatch fault zone, and persistent quiescence along major sectors of the Wasatch Fault.