Wasatch Fault, Nephi, Utah

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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These photos were taken on a Geological Society of America field trip, October 15, 2005, run by Ron Bruhn, Christopher DuRoss, Ronald Harris and William Lund.

Wasatch Fault, UtahWasatch Fault, Utah
Above: large landslide along I-15 north of NephiBelow: looking north along the Wasatch Fault.
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, Utah Left: looking west from atop the scarp.

Below: looking north along the Wasatch Fault. The Pleistocene alluvial fan is offset by about 20 meters. Rupture is estimated to have begun about 70,000 years ago.

Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, Utah Left and below: the deeper shadows at the base of the scarp show the slope is steeper there, possibly indicating more recent and rapid uplift.
Wasatch Fault, Utah Below: looking south along the fault. The older alluvium is eroded away here and the rupture in this Holocene fan amounts to about 6 meters.
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, Utah Left and below: typical arid climate weathering textures in limestone. Etching and rough surface textures are characteristic. Note the crinoid stems in the cobble below.
Wasatch Fault, UtahWasatch Fault, Utah
Wasatch Fault, Utah Left and below: perfect lighting accentuates the scarp north of Nephi. Unfortunately, window reflections hinder the view. Fortunately, digital processing makes them a lot less prominent.
Wasatch Fault, UtahWasatch Fault, Utah

Reference

Bruhn, R. L., DuRoss, C. B., Harris, R. A., and Lund, W. R., 2005; Neotectonics and Paleoseismology of the Wasatch Fault, Utah, in Pedersen, J. and Dehler, C. M., eds., Interior Western United States: Geological Society of America Field Guide number 6, p. 231-250, doi: 10.1130/2005.fld006(11).


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Created 18 November 2005, Last Update 01 July 2012

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