气候变化领域集成服务门户(CCPortal): Subsidence-Derived Volumetric Strain Models for Mapping Extensional Fissures and Constraining Rock Mechanical Properties in the San Joaquin Valley, California

CCPortal

DOI	10.1029/2020JB019980
	Subsidence-Derived Volumetric Strain Models for Mapping Extensional Fissures and Constraining Rock Mechanical Properties in the San Joaquin Valley, California
	Carlson G.; Shirzaei M.; Ojha C.; Werth S.
发表日期	2020
ISSN	21699313
卷号	125 期号:9
英文摘要	Large-scale subsidence due to aquifer-overdraft is an ongoing hazard in the San Joaquin Valley. Subsidence continues to cause damage to infrastructure and increases the risk of extensional fissures.Here, we use InSAR-derived vertical land motion (VLM) to model the volumetric strain rate due to groundwater storage change during the 2007–2010 drought in the San Joaquin Valley, Central Valley, California. We then use this volumetric strain rate model to calculate surface tensile stress in order to predict regions that are at the highest risk for hazardous tensile surface fissures. We find a maximum volumetric strain rate of −232 microstrain/yr at a depth of 0 to 200 m in Tulare and Kings County, California. The highest risk of tensile fissure development occurs at the periphery of the largest subsiding zones, particularly in Tulare County and Merced County. Finally, we assume that subsidence is likely due to aquifer pressure change, which is calculated using groundwater level changes observed at 300 wells during this drought. We combine pressure data from selected wells with our volumetric strain maps to estimate the quasi-static bulk modulus, K, a poroelastic parameter applicable when pressure change within the aquifer is inducing volumetric strain. This parameter is reflective of a slow deformation process and is one to two orders of magnitude lower than typical values for the bulk modulus found using seismic velocity data. The results of this study highlight the importance of large-scale, high-resolution VLM measurements in evaluating aquifer system dynamics, hazards associated with overdraft, and in estimating important poroelastic parameters. ©2020. The Authors.
英文关键词	drought; groundwater; hazard; San Joaquin Valley; volume strain
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/187641
作者单位	School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Department of Geosciences, Virginia Tech, Blacksburg, VA, United States; Positioning and Community Safety Division, Geoscience Australia, Canberra, ACT, Australia; School of Geographical Sciences and Urban Planning, Arizona State University, Tempe, AZ, United States
推荐引用方式 GB/T 7714	Carlson G.,Shirzaei M.,Ojha C.,et al. Subsidence-Derived Volumetric Strain Models for Mapping Extensional Fissures and Constraining Rock Mechanical Properties in the San Joaquin Valley, California[J],2020,125(9).
APA	Carlson G.,Shirzaei M.,Ojha C.,&Werth S..(2020).Subsidence-Derived Volumetric Strain Models for Mapping Extensional Fissures and Constraining Rock Mechanical Properties in the San Joaquin Valley, California.Journal of Geophysical Research: Solid Earth,125(9).
MLA	Carlson G.,et al."Subsidence-Derived Volumetric Strain Models for Mapping Extensional Fissures and Constraining Rock Mechanical Properties in the San Joaquin Valley, California".Journal of Geophysical Research: Solid Earth 125.9(2020).