气候变化领域集成服务门户(CCPortal): High-resolution seismic imaging of the plate boundary in northern Baja California and southern California using double-pair double-difference tomography

CCPortal

DOI	10.1016/j.epsl.2021.117004
	High-resolution seismic imaging of the plate boundary in northern Baja California and southern California using double-pair double-difference tomography
	Share P.-E.; Castro R.R.; Vidal-Villegas J.A.; Mendoza L.; Ben-Zion Y.
发表日期	2021
ISSN	0012821X
卷号	568
英文摘要	We image seismic properties of the plate boundary through northern Baja California and southernmost California using a double-difference tomography and earthquake relocation algorithm that incorporates both event-pair and station-pair data. The data are derived from seismic networks in southern California (SCSN) and northern Baja California (CICESE). It comprises >700,000 travel times (P and S) associated with ∼200 seismic stations and >21,000 local earthquakes from 2003-2018, along with >2,000,000 event-pair and >1,500,000 station-pair double-differences derived from these travel times. In the upper crust, low VP values in the resultant models imply deep sediments and sedimentary rocks northwest of the Salton Sea and around the northern end of the Imperial fault. Low VS values indicate regions of rock damage at the northern ends of the Sierra Juarez fault zone and Laguna Salada fault, and the southern end of the San Jacinto fault zone (SJFZ). Shallow seismicity (d<956 km) highlights the Salton Buttes and Cerro Prieto volcanoes as high heat-flow thin crust regions. At mid to lower crustal depths, the sharpest contrast in crustal VP and most prominent low VS anomaly (V∼S3.4 km/s, VP/VS ∼ 1.9) occurs along a corridor extending northwestward from the Cerro Prieto fault (CPF), east of and subparallel to the Sierra El Mayor/Cucapah and into the southern SJFZ, indicating a continuous weak fluid-rich zone. At ∼25 km depth, we observe uppermost mantle velocities (V∼P7.8 km/s) in the eastern Salton Trough, crustal velocities (V
关键词	double-difference tomography Peninsular Ranges Salton Trough seismic velocities tectonic and fault structure
英文关键词	Earthquakes; Faulting; Plates (structural components); Sedimentary rocks; Structural geology; Velocity; Baja california; Cerro Prieto; Double-difference tomography; Fault structure; Fault zone; Peninsular range; Plate boundaries; Salton Trough; Seismic velocities; Tectonic structure; Tomography; Laguna
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203290
作者单位	Institute of Geophysics and Planetary Physics, University of California San Diego, La Jolla, CA, United States; Center for Scientific Research and Higher Education of Ensenada (CICESE)Baja California, Mexico; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Southern California Earthquake Center, University of Southern California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Share P.-E.,Castro R.R.,Vidal-Villegas J.A.,et al. High-resolution seismic imaging of the plate boundary in northern Baja California and southern California using double-pair double-difference tomography[J],2021,568.
APA	Share P.-E.,Castro R.R.,Vidal-Villegas J.A.,Mendoza L.,&Ben-Zion Y..(2021).High-resolution seismic imaging of the plate boundary in northern Baja California and southern California using double-pair double-difference tomography.Earth and Planetary Science Letters,568.
MLA	Share P.-E.,et al."High-resolution seismic imaging of the plate boundary in northern Baja California and southern California using double-pair double-difference tomography".Earth and Planetary Science Letters 568(2021).