气候变化领域集成服务门户(CCPortal): Spatial Variations of Upper Crustal Anisotropy Along the San Jacinto Fault Zone in Southern California: Constraints From Shear Wave Splitting Analysis

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DOI	10.1029/2020JB020876
	Spatial Variations of Upper Crustal Anisotropy Along the San Jacinto Fault Zone in Southern California: Constraints From Shear Wave Splitting Analysis
	Jiang E.; Liu K.H.; Gao Y.; Fu X.; Gao S.S.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	To discern spatial and explore possible existence of temporal variations of upper crustal anisotropy in an ∼15 km section of the San Jacinto Fault Zone (SJFZ) that is composed of the Buck Ridge and Clark faults in southern California, we conduct a systematic shear wave splitting investigation using local S-wave data recorded by three broadband seismic stations located near the surface expression of the SJFZ. An automatic data selection and splitting measurement procedure is first applied, and the resulting splitting measurements are then manually screened to ensure reliability of the results. Strong spatial variations in crustal anisotropy are revealed by 1,694 pairs of splitting parameters (fast polarization orientation and splitting delay time), as reflected by the dependence of the resulting splitting parameters on the location and geometry of the raypaths. For raypaths traveling through the fault zones, the fast orientations are dominantly WNW-ESE which is parallel to the faults and may be attributed to fluid-filled fractures in the fault zones. For non-fault-zone crossing raypaths, the fast orientations are dominantly N–S which are consistent with the orientation of the regional maximum compressive stress. A three-dimensional model of upper crustal anisotropy is constructed based on the observations. An increase in the raypath length normalized splitting times is observed after the 03/11/2013 M4.7 earthquake, which is probably attributable to changes in the spatial distribution of earthquakes before and after the M4.7 earthquake rather than reflecting temporal changes of upper crustal anisotropy. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	California; crustal anisotropy; San Jacinto Fault; shear wave splitting; stress field
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/187213
作者单位	Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO, United States; Key Laboratory of Earthquake Prediction, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing, China; College of Earth Science and Research Institute of Unconventional Oil and Gas, Northeast Petroleum University, Daqing, Heilongjiang, China
推荐引用方式 GB/T 7714	Jiang E.,Liu K.H.,Gao Y.,et al. Spatial Variations of Upper Crustal Anisotropy Along the San Jacinto Fault Zone in Southern California: Constraints From Shear Wave Splitting Analysis[J],2021,126(4).
APA	Jiang E.,Liu K.H.,Gao Y.,Fu X.,&Gao S.S..(2021).Spatial Variations of Upper Crustal Anisotropy Along the San Jacinto Fault Zone in Southern California: Constraints From Shear Wave Splitting Analysis.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Jiang E.,et al."Spatial Variations of Upper Crustal Anisotropy Along the San Jacinto Fault Zone in Southern California: Constraints From Shear Wave Splitting Analysis".Journal of Geophysical Research: Solid Earth 126.4(2021).