气候变化领域集成服务门户(CCPortal): Variations of Stress Parameters in the Southern California Plate Boundary Around the South Central Transverse Ranges

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DOI	10.1029/2020JB019482
	Variations of Stress Parameters in the Southern California Plate Boundary Around the South Central Transverse Ranges
	Abolfathian N.; Martínez-Garzón P.; Ben-Zion Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	We examine the stress field in Southern California with a focus on the region near the South Central Transverse Ranges (SCTR), using a refined stress inversion methodology. We independently invert declustered and aftershocks focal mechanisms from the years 1981 to 2017. Comparisons between the stress field orientations and the stress ratios from these inversions provide information on local sources of the stress field. Regionally, the SHmax tends to be toward NNE and the stress ratios vary from transtensional stress regime near the Eastern California Shear Zone (ECSZ), to strike-slip faulting near the SCTR, and toward transpression near the Western Transverse Ranges. Detailed analysis of stress parameters near the SCTR indicates deviations from the regional strike-slip faulting including the following: (1) The San Bernardino Mountain area shows SHmax direction toward NNW and transpressional stress components likely associated with the motions of the San Andreas Fault and ECSZ; (2) the Cajon Pass and San Gorgonio Pass show transpressional stress regime near the bottom of the seismogenic zone likely associated with the elevated topography; and (3) in Crafton Hills, rotation of the principal stress plunges and SHmax direction and transtensional stress regime below ~10 km, along with lower estimated apparent friction coefficient, suggest a weak fault possibly associated with deep creep. The performed multiscale analysis resolves effects of regional and local loadings. The average stress parameters in the analyzed 37 years do not show significant temporal variations of stress field near the SCTR region. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	aftershocks; fault loading; South Central Transverse Ranges; stress; stress inversion
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/187692
作者单位	University of Southern California, Los Angeles, CA, United States; GFZ German Research Centre for Geosciences, Potsdam, Germany
推荐引用方式 GB/T 7714	Abolfathian N.,Martínez-Garzón P.,Ben-Zion Y.. Variations of Stress Parameters in the Southern California Plate Boundary Around the South Central Transverse Ranges[J],2020,125(8).
APA	Abolfathian N.,Martínez-Garzón P.,&Ben-Zion Y..(2020).Variations of Stress Parameters in the Southern California Plate Boundary Around the South Central Transverse Ranges.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Abolfathian N.,et al."Variations of Stress Parameters in the Southern California Plate Boundary Around the South Central Transverse Ranges".Journal of Geophysical Research: Solid Earth 125.8(2020).