气候变化领域集成服务门户(CCPortal): Permanent Co-Seismic Deformation of the 2013 Mw7.7 Baluchistan, Pakistan Earthquake From High-Resolution Surface Strain Analysis

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DOI	10.1029/2020JB020622
	Permanent Co-Seismic Deformation of the 2013 Mw7.7 Baluchistan, Pakistan Earthquake From High-Resolution Surface Strain Analysis
	Cheng G.; Barnhart W.D.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Repeated earthquake cycles produce topography, fault damage zones, and other geologic structures along faults. These geomorphic and structural features indicate the presence of co-seismic permanent (inelastic) surface deformation, yet a long-standing question in earthquake research is how much of the co-seismic deformation field is elastic versus inelastic. These questions arise in part because it is unclear what measurable co-seismic characteristics, such as off-fault or distributed surface deformation and cracking, represent true unrecoverable deformation. One emerging descriptor of permanent co-seismic deformation is surface strain magnitudes inferred from imaging geodesy observations. In this study, we present the surface strain field of the 2013 Mw7.7 Baluchistan strike-slip earthquake in southern Pakistan. We invert co-seismic displacement fields generated from pixel-tracking of SPOT-5 and WorldView optical imagery for co-seismic surface horizontal strain tensors. We observe that co-seismic strain field is dominated by negative dilatation strains, indicating that the co-seismic fault zone contracted during the earthquake. We show that co-seismic inelastic failure exhibits a relatively consistent width along the rupture that is localized to a zone 100–200 m wide on the hanging wall side. The width of co-seismic permanent deformation does not correlate with variations in off-fault deformation or surface geology. Based on comparisons to other recent earthquakes, we posit that the permanent surface strains reflect inelastic deformation of the faults inner damage zone, and that the width of this zone reflects fault maturity. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	co-seismic inelastic deformation; fault damage zone; optical geodesy; strain analysis
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/187322
作者单位	Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA, United States; Now at Earthquake Hazards Program Office, US Geological Survey, Golden, CO, United States
推荐引用方式 GB/T 7714	Cheng G.,Barnhart W.D.. Permanent Co-Seismic Deformation of the 2013 Mw7.7 Baluchistan, Pakistan Earthquake From High-Resolution Surface Strain Analysis[J],2021,126(3).
APA	Cheng G.,&Barnhart W.D..(2021).Permanent Co-Seismic Deformation of the 2013 Mw7.7 Baluchistan, Pakistan Earthquake From High-Resolution Surface Strain Analysis.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Cheng G.,et al."Permanent Co-Seismic Deformation of the 2013 Mw7.7 Baluchistan, Pakistan Earthquake From High-Resolution Surface Strain Analysis".Journal of Geophysical Research: Solid Earth 126.3(2021).