气候变化领域集成服务门户(CCPortal): Active Steady-State Creep on A Nontectonic Normal Fault in Southeast Utah: Implications for Strain Release in a Rapidly Deforming Salt System

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DOI	10.1029/2020GL087081
	Active Steady-State Creep on A Nontectonic Normal Fault in Southeast Utah: Implications for Strain Release in a Rapidly Deforming Salt System
	Kravitz K.; Mueller K.; Bilham R.G.; Walton M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:11
英文摘要	Characterizing short-term temporal variations of fault creep provide insight into the evolution, mechanics, and strength of fault systems. Using spirit leveling and an extensometer, we measured active slip of a surface fault southwest of the Needles District, Canyonlands National Park, Utah, where exteis driven by differential unloading of a subsurface salt layer due to incision of the Colorado River. Results show continuous creep at maximum rates of 0.7 ± 0.2 mm/yr without large temporal variations typical of episodic creep events. Occasional, minor transient events in fault slip velocity coincided with water infiltration; however, we found no significant relation between precipitation and transient events. Detailed mapping of widespread, fault-parallel sinkholes provide evidence for dilation of faults at shallow depth, a process that lowers fault strength. We propose continuous slip is related to low fault strength and differential unloading, as opposed to other salt systems where dissolution has been linked to episodic slip. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Creep; Unloading; Continuous slip; National parks; Shallow depths; Steady-state creep; Strain release; Temporal variation; Transient events; Water infiltration; Fault slips; creep; dissolution; fault slip; geological mapping; infiltration; leveling; sinkhole; temporal variation; unloading; Canyonlands National Park; Colorado River [North America]; United States; Utah
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170271
作者单位	Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States; Now at Department of Earth and Atmospheric Sciences, Indiana University Bloomington, Bloomington, IN, United States; Now at U.S. Geological Survey Pacific Coastal and Marine Science Center, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Kravitz K.,Mueller K.,Bilham R.G.,et al. Active Steady-State Creep on A Nontectonic Normal Fault in Southeast Utah: Implications for Strain Release in a Rapidly Deforming Salt System[J],2020,47(11).
APA	Kravitz K.,Mueller K.,Bilham R.G.,&Walton M..(2020).Active Steady-State Creep on A Nontectonic Normal Fault in Southeast Utah: Implications for Strain Release in a Rapidly Deforming Salt System.Geophysical Research Letters,47(11).
MLA	Kravitz K.,et al."Active Steady-State Creep on A Nontectonic Normal Fault in Southeast Utah: Implications for Strain Release in a Rapidly Deforming Salt System".Geophysical Research Letters 47.11(2020).