气候变化领域集成服务门户(CCPortal): Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust

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DOI	10.1029/2020JB019525
	Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust
	Schulte-Pelkum V.; Ross Z.E.; Mueller K.; Ben-Zion Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Plate motions in Southern California have undergone a transition from compressional and extensional regimes to a dominantly strike-slip regime in the Miocene. Strike-slip motion is most easily accommodated on vertical faults, and major transform fault strands in the region are typically mapped as near vertical on the surface. However, some previous work suggests that these faults have a dipping geometry at depth. We analyze receiver function arrivals that vary harmonically with back azimuth at all available broadband stations in the region. The results show a dominant signal from contrasts in dipping foliation as well as dipping isotropic velocity contrasts from all crustal depths, including from the ductile middle to lower crust. We interpret these receiver function observations as a dipping fault-parallel structural fabric that is pervasive throughout the region. The strike of these structures and fabrics is parallel to that of nearby fault surface traces. We also plot microseismicity on depth profiles perpendicular to major strike-slip faults and find consistently NE dipping features in seismicity changing from near vertical (80–85°) on the Elsinore Fault in the Peninsular Ranges to 60–65° slightly further inland on the San Jacinto Fault to 50–55° on the San Andreas Fault. Taken together, the dipping features in seismicity and in rock fabric suggest that preexisting fabrics and faults may have acted as strain guides in the modern slip regime, with reactivation and growth of strike-slip faults along northeast dipping fabrics both above and below the brittle-ductile transition. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	anisotropy; inheritance; reactivation; receiver functions; seismicity; tectonics
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/187669
作者单位	Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, United States; Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Earth Sciences and Southern California Earthquake Center, University of Southern California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Schulte-Pelkum V.,Ross Z.E.,Mueller K.,et al. Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust[J],2020,125(8).
APA	Schulte-Pelkum V.,Ross Z.E.,Mueller K.,&Ben-Zion Y..(2020).Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Schulte-Pelkum V.,et al."Tectonic Inheritance With Dipping Faults and Deformation Fabric in the Brittle and Ductile Southern California Crust".Journal of Geophysical Research: Solid Earth 125.8(2020).