气候变化领域集成服务门户(CCPortal): Seismic Reflection Imaging of the Low-Angle Panamint Normal Fault System, Eastern California

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DOI	10.1029/2020JB020243
	Seismic Reflection Imaging of the Low-Angle Panamint Normal Fault System, Eastern California
	Gold R.D.; Stephenson W.J.; Briggs R.W.; DuRoss C.B.; Kirby E.; Woolery E.; Delano J.; Odum J.K.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	Shallowly dipping (<30°) low-angle normal faults (LANFs) have been documented globally; however, examples of active LANFs in continental settings are limited. The western margin of the Panamint Range in eastern California is defined by a LANF that dips west beneath Panamint Valley and has evidence of Quaternary motion. In addition, high-angle dextral-oblique normal faults displace middle to late Quaternary alluvial fans near the range front. To image shallow (<1 km depth), crosscutting relationships between the low- and high-angle faults along the range front, we acquired two high-resolution P wave seismic reflection profiles. The northern, 4.6-km-long profile crosses the 2-km-wide Wildrose graben and the southern, 0.8-km-long profile extends onto the Panamint Valley playa, ~7.5 km S of Ballarat, CA. The profile across the Wildrose graben reveals a robust, low-angle reflector interpreted to represent the LANF separating Plio-Pleistocene alluvial fanglomerate and Proterozoic metasedimentary deposits. High-angle faults interpreted in the seismic profile correspond to fault scarps on Quaternary alluvial fan surfaces. Interpretation of the reflection data suggests that the high-angle faults vertically displace the LANF up to 80 m within the Wildrose graben. Similarly, the profile south of Ballarat reveals a low-angle reflector, which appears both rotated and displaced up to 260 m by high-angle faults. These results suggest that near the Panamint range front, the high-angle faults are the dominant active structures. We conclude that at least at shallow (<1 km) depths, the LANF we imaged is not active today. Published 2020. This article is a U.S. Government work and is in the public domain in the USA.
英文关键词	California; low-angle normal fault; Panamint Valley; Panamint Valley fault zone; seismic reflection
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/187494
作者单位	U.S. Geological Survey, Geologic Hazards Science Center, Golden, CO, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Earth and Environmental Sciences, University of Kentucky, Lexington, KY, United States
推荐引用方式 GB/T 7714	Gold R.D.,Stephenson W.J.,Briggs R.W.,et al. Seismic Reflection Imaging of the Low-Angle Panamint Normal Fault System, Eastern California[J],2020,125(11).
APA	Gold R.D..,Stephenson W.J..,Briggs R.W..,DuRoss C.B..,Kirby E..,...&Odum J.K..(2020).Seismic Reflection Imaging of the Low-Angle Panamint Normal Fault System, Eastern California.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Gold R.D.,et al."Seismic Reflection Imaging of the Low-Angle Panamint Normal Fault System, Eastern California".Journal of Geophysical Research: Solid Earth 125.11(2020).