Characterization of the Rubys Inn Thrust Fault in Garfield County, Utah, Using Electrical Resistivity Tomography and Transient Electromagnetic Surveys (RI-290)
This study investigates the potential role of the Rubys Inn fault in Garfield County as a barrier, conduit, or combination thereof to groundwater flow, which has implications for the possible impacts of development in Emery Valley on springs and their dependent ecosystems in Bryce Canyon National Park. The study employed transient electromagnetic (TEM) surveys that use electric and magnetic fields to image the subsurface, and electrical resistivity tomography (ERT) surveys that measure soil and rock resistance to electrical flow, to image the subsurface. These geophysical data, combined with existing water-level and soil/rock data from monitoring wells, were used to create subsurface groundwater flow models that reveal complex variability over short distances along the fault. Furthermore the study placed the buried fault 70 to 100 meters from its originally mapped location.