气候变化领域集成服务门户(CCPortal): Bookshelf Kinematics and the Effect of Dilatation on Fault Zone Inelastic Deformation: Examples From Optical Image Correlation Measurements of the 2019 Ridgecrest Earthquake Sequence

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DOI	10.1029/2020JB020551
	Bookshelf Kinematics and the Effect of Dilatation on Fault Zone Inelastic Deformation: Examples From Optical Image Correlation Measurements of the 2019 Ridgecrest Earthquake Sequence
	Milliner C.; Donnellan A.; Aati S.; Avouac J.-P.; Zinke R.; Dolan J.F.; Wang K.; Bürgmann R.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The 2019 Ridgecrest earthquake sequence initiated on July 4th with a series of foreshocks, including an Mw 6.4 event, that culminated a day later with the Mw 7.1 mainshock and resulted in rupture of a set of cross-faults. In this study, we use subpixel correlation of optical satellite imagery to measure the displacement, finite strain, and rotation of the near-field coseismic deformation to understand the kinematics of strain release along the surface ruptures. We find the average off-fault deformation along the mainshock rupture is 34% and is significantly higher along the foreshock rupture (56%), suggesting it is a less structurally developed fault system. Measurements of the 2D dilatational strain along the mainshock rupture show a dependency of the width of inelastic strain with the degree of fault extension and contraction, indicating wider fault zones under extension than under shear. Measurements of the vorticity along the main, dextral rupture show that conjugate sinistral faults are embedded within zones of large clockwise rotations caused by the transition of strain beyond the tips of dextral faults leading to bookshelf kinematics. These rotations and bookshelf slip can explain why faults of different shear senses do not intersect one another and the occurrence of pervasive and mechanically unfavorable cross-faulting in this region. Understanding the causes for the variation of fault zone widths along surface ruptures has importance for reducing the epistemic uncertainty of probabilistic models of distributed rupture that will, in turn, provide more precise estimates of the hazard distributed rupture poses to nearby infrastructure. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	dilatation; distributed rupture; finite strain; inelastic; off-fault deformation; Ridgecrest; rotation
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/187310
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Milliner C.,Donnellan A.,Aati S.,et al. Bookshelf Kinematics and the Effect of Dilatation on Fault Zone Inelastic Deformation: Examples From Optical Image Correlation Measurements of the 2019 Ridgecrest Earthquake Sequence[J],2021,126(3).
APA	Milliner C..,Donnellan A..,Aati S..,Avouac J.-P..,Zinke R..,...&Bürgmann R..(2021).Bookshelf Kinematics and the Effect of Dilatation on Fault Zone Inelastic Deformation: Examples From Optical Image Correlation Measurements of the 2019 Ridgecrest Earthquake Sequence.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Milliner C.,et al."Bookshelf Kinematics and the Effect of Dilatation on Fault Zone Inelastic Deformation: Examples From Optical Image Correlation Measurements of the 2019 Ridgecrest Earthquake Sequence".Journal of Geophysical Research: Solid Earth 126.3(2021).