Vol. 40 (2017)
Research Project Geology

Paleoseismic study of the Northern Teton Fault, Wyoming

Glenn D. Thackray
Department of Geosciences, Idaho State University, Pocatello, ID
Mark Zellman
BGC Engineering Inc., Denver, CO
A rock wall with flags marking the sides.
Published December 15, 2017


We investigated the earthquake history of the northern portion of the Teton fault by excavating two trenches across a fault scarp near the eastern shore of Jackson Lake, near Steamboat Mountain. We identified the primary stratigraphy of the trenches, logged the trenches in detail, and collected samples for dating analyses. The trenches exposed faulted glacial sediments and overlying hill slope colluvium and alluvial sediments. Interpretation of the trench stratigraphy is ongoing. Samples are currently being analyzed using radiocarbon and luminescence dating techniques to determine the ages of the sediments and constrain the timing of fault rupture. We hosted several visitors at the trench site, including professionals and students, and introduced two interns to the process of fault trenching and documentation.


Featured photo from Figure 3 in report.