气候变化领域集成服务门户(CCPortal): A Block Model of Present-Day Kinematics of Alaska and Western Canada

CCPortal

DOI	10.1029/2019JB018378
	A Block Model of Present-Day Kinematics of Alaska and Western Canada
	Elliott J.; Freymueller J.T.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	We present an updated GPS velocity field for Alaska and western Canada and use it to develop the first regionally comprehensive tectonic block model for the area based on modern geodetic data. The greatest tectonic influences along the southern margin are the translation, collision, and flat slab subduction of the Yakutat block and subduction of the Pacific plate. Northward directed velocities surrounding the Yakutat collisional front are consistent with indenter-related deformation while southcentral Alaska is undergoing a counterclockwise rotation. Westerly velocities in western Alaska and along the Aleutian forearc suggest that crustal material is escaping into the Bering Sea region. The majority of relative plate motion is taken up along major boundary faults, but right-lateral strike-slip faults in interior and western Alaska accommodate part of the motion. Escape tectonics in western Alaska extends as far north as the Kaltag fault. We observe significant motion relative to North America in every part of Alaska, including the North Slope. Evidence of localized right-lateral shear between the Totschunda and Fairweather faults suggests that strain transfer into interior Alaska has moved away from the eastern Denali-Chatham Strait system to a more direct corridor. Observed deformation in southcentral Alaska indicates that locked portions of the Yakutat flat slab extend further east and north than previously estimated. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	active tectonics; Alaska, geodesy; Aleutian subduction zone; strike-slip faults; Yakutat block
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/187756
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States; Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, United States
推荐引用方式 GB/T 7714	Elliott J.,Freymueller J.T.. A Block Model of Present-Day Kinematics of Alaska and Western Canada[J],2020,125(7).
APA	Elliott J.,&Freymueller J.T..(2020).A Block Model of Present-Day Kinematics of Alaska and Western Canada.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Elliott J.,et al."A Block Model of Present-Day Kinematics of Alaska and Western Canada".Journal of Geophysical Research: Solid Earth 125.7(2020).