Crustal Architecture Across Southern California and Its Implications on San Andreas Fault Development

被引：2
|
作者：
Sui, Siyuan [1 ]
Shen, Weisen [1 ]
Holt, William [1 ]
Kim, Jeonghyeop [1 ,2 ]
机构：
[1] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
[2] Univ Washington, Dept Earth & Space Sci, Seattle, WA USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 08期
基金：
美国国家航空航天局; 美国国家科学基金会;
关键词：
Vp; Vs; Southern California; chemical composition; strain rates; southern San Andreas; PLATE-BOUNDARY; NORTH-AMERICA; SALTON TROUGH; SIERRA-NEVADA; UPPER-MANTLE; VELOCITY; PACIFIC; TOMOGRAPHY; RANGES; MODEL;
D O I：
10.1029/2022GL101976
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
In this study, we perform a 2-frequency sequential receiver function stacking investigation in Southern California. The resulting Moho depths exhibit similar patterns to previous studies while the crystalline crustal Vp/Vs values show more regional variations. Most Vp/Vs variations can be explained by compositional differences. We observe a dichotomy in Moho depth, Vp/Vs, and crustal strain rates between the Peninsular Ranges and Southern San Andreas Fault system. Comparisons between strain rates, Vp/Vs, and temperature suggest that crustal compositional variations may have played a more critical role in influencing the crustal strain rate variations in the Peninsular Ranges and Southern San Andreas than temperature. The structural and compositional variations provide a new insight into the causes of the migration of the Southern San Andreas Fault system and the formation of the "Big Bend."
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页数：9
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