气候变化领域集成服务门户(CCPortal): Crustal Strain Patterns Associated With Normal, Drought, and Heavy Precipitation Years in California

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DOI	10.1029/2020JB019560
	Crustal Strain Patterns Associated With Normal, Drought, and Heavy Precipitation Years in California
	Kim J.; Bahadori A.; Holt W.E.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	We invert continuously operating Global Positioning System (cGPS) data obtained between 2007 and 2019 to quantify non steady-state horizontal strain anomalies in California. Our long-wavelength transient strain model shows seasonal and multiannual variations in horizontal strain anomalies within the plate boundary zone. During the summer, in general, a zone of extensional dilatation develops along the San Andreas Fault zone and Sierra Nevada, whereas contractional dilatation develops along the Eastern California Shear Zone (ECSZ) north of 36.5°N. The patterns of dilatational strain are opposite during the winter. We find that these seasonal strain anomaly patterns vary in magnitude, depending on precipitation intensity in California. Investigating hydrologic loading models and their horizontal elastic responses reveal that water mass loads on the surface from the precipitation in California are the major sources of the observed long-wavelength horizontal transient strains. We show, however, that a heavy damping in the inversion of the cGPS data is required for the long-wavelength horizontal strain solutions to best match with the expected elastic response from hydrologic loading. Appropriate fitting of the horizontal cGPS yields amplified horizontal strain signals in the Sierra Nevada, along regions adjacent to the San Andreas Fault, and within the ECSZ. The larger-than-expected amplitudes may be associated with poroelastic responses or thermoelastic changes that are superimposed on the hydrologic response. We demonstrate that there is a persistent sharp boundary of horizontal dilatational strain domains at the transition between the High Sierra and Basin and Range Province, caused by the sharp gradient in hydrologic loading there. © 2020. The Authors.
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/187436
作者单位	Department of Geosciences, Stony Brook University, Stony Brook, NY, United States
推荐引用方式 GB/T 7714	Kim J.,Bahadori A.,Holt W.E.. Crustal Strain Patterns Associated With Normal, Drought, and Heavy Precipitation Years in California[J],2021,126(1).
APA	Kim J.,Bahadori A.,&Holt W.E..(2021).Crustal Strain Patterns Associated With Normal, Drought, and Heavy Precipitation Years in California.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Kim J.,et al."Crustal Strain Patterns Associated With Normal, Drought, and Heavy Precipitation Years in California".Journal of Geophysical Research: Solid Earth 126.1(2021).