气候变化领域集成服务门户(CCPortal): Holocene earthquake history and slip rate of the southern Teton fault, Wyoming, USA

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DOI	10.1130/B35363.1
	Holocene earthquake history and slip rate of the southern Teton fault, Wyoming, USA
	DuRoss C.B.; Gold R.D.; Briggs R.W.; Delano J.E.; Ostenaa D.A.; Zellman M.S.; Cholewinski N.; Wittke S.J.; Mahan S.A.
发表日期	2020
ISSN	167606
起始页码	1566
结束页码	1586
卷号	132 期号:2021-07-08
英文摘要	The 72-km-long Teton normal fault bounds the eastern base of the Teton Range in northwestern Wyoming, USA. Although geomorphic surfaces along the fault record latest Pleistocene to Holocene fault movement, the postglacial earthquake history of the fault has remained enigmatic. We excavated a paleoseismic trench at the Buffalo Bowl site along the southernmost part of the fault to determine its Holocene rupture history and slip rate. At the site, ∼6.3 m of displacement postdates an early Holocene (ca. 10.5 ka) alluvial-fan surface. We document evidence of three surface-faulting earthquakes based on packages of scarp-derived colluvium that postdate the alluvial-fan units. Bayesian modeling of radiocarbon and luminescence ages yields earthquake times of ca. 9.9 ka, ca. 7.1 ka, and ca. 4.6 ka, forming the longest, most complete paleoseismic record of the Teton fault. We integrate these data with a displaced deglacial surface 4 km NE at Granite Canyon to calculate a postglacial to mid-Holocene (14.4-4.6 ka) slip rate of ∼1.1 mm/yr. Our analysis also suggests that the postglacial to early Holocene (14.4-9.9 ka) slip rate exceeds the Holocene (9.9-4.6 ka) rate by a factor of ∼2 (maximum of 3); however, a uniform rate for the fault is possible considering the 95% slip-rate errors. The ∼5 k.y. elapsed time since the last rupture of the southernmost Teton fault implies a current slip deficit of ∼4-5 m, which is possibly explained by spatially/temporally incomplete paleoseismic data, irregular earthquake recurrence, and/or variable per-event displacement. Our study emphasizes the importance of minimizing slip-rate uncertainties by integrating paleoseismic and geomorphic data sets and capturing multiple earthquake cycles. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184747
作者单位	U.S. Geological Survey, MS 966, P.O. Box 25046, Denver, CO 80225, United States; Ostenaa Geologic, 25 Grays Peak Trail, Dillon, CO 80435, United States; BGC Engineering, Inc., Suite 211, 701 12th Street, Golden, CO 80401, United States; Wyoming State Geological Survey, P.O. Box 1347, Laramie, WY 82073, United States; U.S. Geological Survey, MS 974, P.O. Box 25046, Denver, CO 80225, United States; currently GEI Consultants, 2868 Prospect Park Drive #400, Rancho Cordova, CA 95670, United States
推荐引用方式 GB/T 7714	DuRoss C.B.,Gold R.D.,Briggs R.W.,et al. Holocene earthquake history and slip rate of the southern Teton fault, Wyoming, USA[J],2020,132(2021-07-08).
APA	DuRoss C.B..,Gold R.D..,Briggs R.W..,Delano J.E..,Ostenaa D.A..,...&Mahan S.A..(2020).Holocene earthquake history and slip rate of the southern Teton fault, Wyoming, USA.Bulletin of the Geological Society of America,132(2021-07-08).
MLA	DuRoss C.B.,et al."Holocene earthquake history and slip rate of the southern Teton fault, Wyoming, USA".Bulletin of the Geological Society of America 132.2021-07-08(2020).