气候变化领域集成服务门户(CCPortal): Slip and Strain Accumulation Along the Sadie Creek Fault, Olympic Peninsula, Washington

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DOI	10.1029/2020JB020276
	Slip and Strain Accumulation Along the Sadie Creek Fault, Olympic Peninsula, Washington
	Duckworth W.C.; Amos C.B.; Schermer E.R.; Loveless J.P.; Rittenour T.M.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Upper-plate faulting in the Olympic Peninsula of Washington State results from relative motion of crustal blocks within the Cascadia forearc and earthquake cycle processes along the Cascadia subduction zone. We reconstruct fault slip rates since ∼14 ka on the Sadie Creek fault (SCF), north of the Olympic Mountains, using airborne lidar and field mapping of surficial deposits and landforms and optically stimulated luminescence and radiocarbon dating. The SCF is a ≥14 km-long northwest-striking, subvertical, dextral strike-slip fault with a subordinate dip-slip component. Laterally, offset debris flow channels cut into Late-Pleistocene and younger surfaces show dextral slip of 4.0–24.5 m and dip slip of 0.7–6.5 m. Re-evaluation of fault slip on the adjacent Lake Creek Boundary Creek fault (LCBCF) shows similar dextral (4.5–29.7 m) and dip slip (0.8–4.6 m). A deglacial age of 14 ka paired with the largest—and presumably oldest—slip measurements produce a minimum dextral slip rate of 1.3–2.3 mm/yr and dip-slip rate of 0.05–0.5 mm/yr. Similarities in geometry, kinematics, slip rate, and earthquake timing between the SCF and LCBCF suggest these faults represent one continuous geologic structure, the North Olympic fault zone. Geodetically constrained boundary element method models considering the effects of coseismic subduction zone stresses on upper plate structures produce comparable kinematics to those measured on the SCF and LCBCF, suggesting that the North Olympic fault zone acts as the main strain-accommodating structure in the northern Olympic Peninsula and may be modulated by stress transferred from subduction zone earthquakes. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187271
作者单位	Geology Department, Western Washington University, Bellingham, WA, United States; Department of Geosciences, Smith College, Northampton, MA, United States; Department of Geology, Utah State University, Logan, UT, United States
推荐引用方式 GB/T 7714	Duckworth W.C.,Amos C.B.,Schermer E.R.,et al. Slip and Strain Accumulation Along the Sadie Creek Fault, Olympic Peninsula, Washington[J],2021,126(3).
APA	Duckworth W.C.,Amos C.B.,Schermer E.R.,Loveless J.P.,&Rittenour T.M..(2021).Slip and Strain Accumulation Along the Sadie Creek Fault, Olympic Peninsula, Washington.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Duckworth W.C.,et al."Slip and Strain Accumulation Along the Sadie Creek Fault, Olympic Peninsula, Washington".Journal of Geophysical Research: Solid Earth 126.3(2021).