POSTGLACIAL SLIP DISTRIBUTION ALONG-STRIKE OF THE TETON NORMAL FAULT (WY) FROM TECTONICALLY OFFSET GEOMORPHOLOGICAL FEATURES

Along the eastern front of the Teton Range, Wyoming, well-preserved fault scarps offset post-LGM deposits and document that multiple earthquakes ruptured the range-bounding Teton normal fault after the last glacial period (e.g., Byrd et al., 1994). Here we use high-resolution digital elevation models derived from Lidar data to determine the postglacial vertical slip distribution along-strike the Teton fault from ca. 50 topographic profiles across tectonically offset geomorphological features along the Teton Range front. We find that offset Pinedale moraine ridges and glacially striated bedrock surfaces show consistently higher vertical displacements than younger fluvial terraces, which formed at valley exits upstream of the Pinedale terminal moraines. Our results also reveal that the postglacial displacement profile of the Teton fault is asymmetric with respect to the Teton Range center, with the maximum vertical displacements (27-23 m) being located between String Lake and along the western shore of Jackson Lake. Such an asymmetric postglacial slip distribution was predicted by previous 3D numerical models, which captured the response of the Teton fault to melting of the Yellowstone ice cap (Hampel et al., 2007), but has never been constrained before. In the future, we will use the new constraints on the postglacial paleo-earthquake history of the Teton fault from Jenny Lake sediment cores (Larsen et al. 2019) and the Buffalo Bull trench site (DuRoss et al., 2019) as well as updated 10Be exposure ages on the deglaciation history of the Yellowstone ice cap (Larsen et al., 2016; Licciardi and Pierce, 2018) to investigate the postglacial response of the Teton fault to deglaciation of the Teton-Yellowstone region with an updated numerical model including earthquake cycles.