气候变化领域集成服务门户(CCPortal): Creep Along the Central San Andreas Fault From Surface Fractures, Topographic Differencing, and InSAR

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DOI	10.1029/2020JB019762
	Creep Along the Central San Andreas Fault From Surface Fractures, Topographic Differencing, and InSAR
	Scott C.; Bunds M.; Shirzaei M.; Toke N.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	Imaging tectonic creep along active faults is critical for measuring strain accumulation and ultimately understanding the physical processes that guide creep and the potential for seismicity. We image tectonic deformation along the central creeping section of the San Andreas Fault at the Dry Lake Valley paleoseismic site (36.468°N, 121.055°W) using three data sets with varying spatial and temporal scales: (1) an Interferometric Synthetic Aperture Radar (InSAR) velocity field with an ~100-km footprint produced from Sentinel-1 satellite imagery, (2) light detection and ranging (lidar) and structure-from-motion 3-D topographic differencing that resolves a decade of deformation over a 1-km aperture, and (3) surface fractures that formed over the 3- to 4-m wide fault zone during a drought from late 2012 to 2014. The InSAR velocity map shows that shallow deformation is localized to the San Andreas Fault. We demonstrate a novel approach for differencing airborne lidar and structure-from-motion topography that facilitates resolving deformation along and adjacent to the San Andreas Fault. The 40-m resolution topographic differencing resolves a 2.5 ± 0.2 cm/yr slip rate localized to the fault. The opening-mode fractures accommodate (Formula presented.) cm/yr of fault slip. A 90% ± 30% of the 1-km aperture deformation is accommodated over the several meter-wide surface trace of the San Andreas Fault. The extension direction inferred from the opening-mode fractures and topographic differencing is 40°–48° from the local trend of the San Andreas Fault. The localization of deformation likely reflects the well-oriented and mature fault. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	creep; Earthquake deformation; geodesy; high-resolution topography; InSAR; lidar
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/187544
作者单位	School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Department of Earth Science, Utah Valley University, Orem, UT, United States; Department of Geosciences, Virginia Tech, Blacksburg, VA, United States
推荐引用方式 GB/T 7714	Scott C.,Bunds M.,Shirzaei M.,et al. Creep Along the Central San Andreas Fault From Surface Fractures, Topographic Differencing, and InSAR[J],2020,125(10).
APA	Scott C.,Bunds M.,Shirzaei M.,&Toke N..(2020).Creep Along the Central San Andreas Fault From Surface Fractures, Topographic Differencing, and InSAR.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Scott C.,et al."Creep Along the Central San Andreas Fault From Surface Fractures, Topographic Differencing, and InSAR".Journal of Geophysical Research: Solid Earth 125.10(2020).