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An Integrated Geophysical Analysis of Shallow Faulting in the Wasatch Fault Zone Near Springville, Utah County, Utah
Gravity, magnetic, and seismic surveys were conducted across the Wasatch fault zone east of Springville, Utah, near the mouth of Hobble Creek Canyon. The geophysical data were acquired, processed, and interpreted to determine possible locations of shallow normal faults within the fault zone. Interpretations of the individual data sets for each site were integrated in order to eliminate spurious readings and to strengthen the interpretations. Visual methods of integration were chosen for this study. In addition to verifying locations of known faults, the geophysical surveys detected numerous possible additional faults not previously mapped.
New structural information about fault densities and styles was also determined from the surveys. The fault concentration for this site is 1.3 faults/100 feet, or one fault per 77 feet. Interpreted antithetic faults at the Hobble Creek site account for 65 percent of the total, while synthetic faults account for 35 percent with respect to the main fault strand.
Information derived from this study should be useful during planning and development of areas within the Wasatch fault zone. The characteristics of subsurface deformation can be used to gain a better understanding of the potential for surface faulting at a given site. This is also useful in planning appropriate site development and remedial measures to help mitigate hazards associated with large-magnitude earthquakes.
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