Holocene rupture history of the central Teton fault at Leigh Lake; Grand Teton National Park, Wyoming

Bulletin of the Seismological Society of America
By: , and 

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Abstract

Prominent scarps on Pinedale glacial surfaces along the eastern base of the Teton Range confirm latest Pleistocene to Holocene surface‐faulting earthquakes on the Teton fault, but the timing of these events is only broadly constrained by a single previous paleoseismic study. We excavated two trenches at the Leigh Lake site near the center of the Teton fault to address open questions about earthquake timing and rupture length. Structural and stratigraphic evidence indicates two surface‐faulting earthquakes at the site that postdate deglacial sediments dated by radiocarbon and optically stimulated luminescence to ∼10–11 ka⁠. Earthquake LL2 occurred at ∼10.0 ka (9.7–10.4 ka; 95% confidence range) and LL1 at ∼5.9 ka (4.8–7.1 ka; 95%). LL2 predates an earthquake at ∼8ka identified in the previous paleoseismic investigation at Granite Canyon. LL1 corresponds to the most recent Granite Canyon earthquake at ∼4.7–7.9 ka (95% confidence range). Our results are consistent with the previously documented long‐elapsed time since the most recent Teton fault rupture and expand the fault’s earthquake history into the early Holocene.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Holocene rupture history of the central Teton fault at Leigh Lake; Grand Teton National Park, Wyoming
Series title Bulletin of the Seismological Society of America
DOI 10.1785/0120190129
Volume 110
Issue 1
Year Published 2020
Language English
Publisher Seismological Society of America
Contributing office(s) Geologic Hazards Science Center
Description 16 p.
First page 67
Last page 82
Country United States
State Wyoming
Other Geospatial Grand Teton National Park
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