气候变化领域集成服务门户(CCPortal): Miocene-Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA

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DOI	10.1130/B31783.1
	Miocene-Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA
	Staisch L.; Kelsey H.; Sherrod B.; Möller A.; Paces J.; Blakely R.; Styron R.
发表日期	2018
ISSN	167606
起始页码	411
结束页码	437
卷号	130 期号:2021-03-04
英文摘要	The Yakima fold province, located in the backarc of the Cascadia subduction zone, is a region of active strain accumulation and deformation distributed across a series of fault-cored folds. The geodetic network in central Washington has been used to interpret large-scale N-S shortening and westwardincreasing strain; however, geodetic data are unable to resolve shortening rates across individual structures in this low-strain-rate environment. Resolving fault geometries, slip rates, and timing of faulting in the Yakima fold province is critically important to seismic hazard assessment for nearby infrastructure and population centers. The Saddle Mountains anticline is one of the most prominent Yakima folds. It is unique within the Yakima fold province in that the syntectonic strata of the Ringold Formation are preserved and provide a record of deformation and drainage reorganization. Here, we present new stratigraphic columns, U-Pb zircon tephra ages, U-series caliche ages, and geophysical modeling that constrain two line-balanced and retrodeformed cross sections. These new constraints indicate that the Saddle Mountains anticline has accommodated 1.0-1.3 km of N-S shortening since 10 Ma, that shortening increases westward along the anticline, and that the average slip rate has increased 6-fold since 6.8 Ma. Provenance analysis suggests that the source terrane for the Ringold Formation was similar to that of the modern Snake River Plain. Using new slip rates and structural constraints, we calculate the strain accumulation time, interpretable as a recurrence interval, for earthquakes on the Saddle Mountains fault and find that large-magnitude earthquakes could rupture along the Saddle Mountains fault every 2-11 k.y. © 2017 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/185065
作者单位	Geology, Minerals, Energy, and Geophysics Science Center, U.S. Geological Survey, Menlo Park, CA 94025, United States; Earthquake Science Center, U.S. Geological Survey, University of Washington, Seattle, WA 98195, United States; Department of Geology, Humboldt State University, Arcata, CA 95521, United States; Department of Geology, University of Kansas, Lawrence, KS 66045, United States; Geoscience and Environmental Change Science Center, U.S. Geological Survey, Denver, CO 80225, United States; Earth Analysis, Seattle, WA 98105, United States; Global Earthquake Model Foundation, Pavia, 27100, Italy
推荐引用方式 GB/T 7714	Staisch L.,Kelsey H.,Sherrod B.,et al. Miocene-Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA[J],2018,130(2021-03-04).
APA	Staisch L..,Kelsey H..,Sherrod B..,Möller A..,Paces J..,...&Styron R..(2018).Miocene-Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA.Bulletin of the Geological Society of America,130(2021-03-04).
MLA	Staisch L.,et al."Miocene-Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA".Bulletin of the Geological Society of America 130.2021-03-04(2018).