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Show 153 THE UNIVERSITY OF UTAH research posters on the hill 2012 WASATCH FAULT STRUCTURAL MAPPING IN THE AREA OF NEFFS CANYON, SALT LAKE CITY, UTAH Daniela Anguita, (Ronald Bruhn) Department of Geology and Geophysics University of Utah The Wasatch normal fault extends for ~370 km from southern Idaho into central Utah, and is subdivided into ten seismogenically independent segments possessing unique paleoearthquake chronologies. The Salt Lake City fault segment extends for ~35 km along the eastern margin of city with a large step-over directly west of Neffs Canyon. A fault running perpendicular to the Wasatch Fault has been previously identified and mapped in Neffs Canyon, yet no relationship has been established between the two fault zones. Detailed mapping of this intersection shows a complicated structural zone with an un-conformity omitting a minimum of 100 My. Bedding has been tilted to ~65°, with a series of beds folding in what might be recent reactivation of the fault surface. The mechanism controlling faults perpendicular to the Wasatch Fault may greatly affect the geometry and behavior of the Wasatch Fault itself. Evidence of these faults includes faceted hill slopes, pervasive occurrence of brecciated rocks and apparent offsets of rock formations. Further mapping will enable the creation of a more complete geologic map and provide a platform on which to base interpretation of the geometry of the Wasatch Fault. |
