Document Type

Grand Teton National Park Report

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Documentation of the location, age and relationship of surface trace of the Teton fault zone to other geologic features is a prerequisite to a full understanding of seismic hazards associated with the fault. The University of Utah's mapping py David Sussong during the summer of 1987 documented the central portion of the fault trace. However, the northern and southern ends of the fault zone still required detailed mapping. Determination of the character of the fault in the areas south of Phillips Canyon and north of Webb Canyon can help to evaluate how movement on the fault would effect these areas, i.e., better evaluation of the relative seismic risk. Unfortunately, the extreme fire situation (the Huck fire started at the location of mapping) and the excessive time demands of the surveying reduced the amount of field mapping that we had planned for detailed geologic mapping. John Byrd, however, was able to do reconnaissance mapping in the Steamboat Mountain and Lizard Point area. In this area there is good evidence for the existence of several faults that are most likely splays of the Teton fault, that cross Jackson Lake and extend northward on the east side of the valley. Additional mapping is planned in this area next year.