气候变化领域集成服务门户(CCPortal): Crustal Deformation in Southern California Constrained by Radial Anisotropy From Ambient Noise Adjoint Tomography

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DOI	10.1029/2020GL088580
	Crustal Deformation in Southern California Constrained by Radial Anisotropy From Ambient Noise Adjoint Tomography
	Wang K.; Jiang C.; Yang Y.; Schulte-Pelkum V.; Liu Q.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:12
英文摘要	We build a new radially anisotropic shear wave velocity model of Southern California based on ambient noise adjoint tomography to investigate crustal deformation associated with Cenozoic evolution of the Pacific-North American plate boundary. Pervasive positive radial anisotropy (4%) is observed in the crust east of the San Andreas Fault (SAF), attributed to subhorizontal alignment of mica/amphibole foliation planes resulting from significant crustal extension. Substantial negative anisotropy (6%) is revealed in the middle/lower crust west of the SAF, where high shear wave speeds are also observed. The negative anisotropy could result from steeply dipping amphibole schists in a shear zone developed during Laramide flat slab subduction. Alternatively, it could be caused by the crystal preferred orientation (CPO) of plagioclase, whose fast axis aligns orthogonally to a presumed subhorizontal foliation. The latter new mechanism highlights potentially complex CPO patterns resulting from different lithospheric mineralogy, as suggested by laboratory experiments on xenoliths from the region. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Acoustic noise; Crystal orientation; Deformation; Feldspar; Mica; Shear flow; Shear waves; Strike-slip faults; Structural geology; Tomography; Wave propagation; Crustal deformations; Crystal preferred orientations; Flat-slab subductions; Laboratory experiments; North american plates; Radially anisotropic; Shear wave velocity models; Southern California; Anisotropy; ambient noise; amphibole; anisotropy; crustal deformation; plagioclase; plate boundary; preferred orientation; S-wave; San Andreas Fault; subduction zone; tomography; Pacific Ocean; Southern California Bight
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170245
作者单位	Department of Physics, University of Toronto, Toronto, ON, Canada; Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, Australia; Now at Research School of Earth Science, The Australian National University, Canberra, ACT, Australia; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Cooperative Institute for Research in Environmental Sciences and Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Earth Sciences, University of Toronto, Toronto, ON, Canada
推荐引用方式 GB/T 7714	Wang K.,Jiang C.,Yang Y.,et al. Crustal Deformation in Southern California Constrained by Radial Anisotropy From Ambient Noise Adjoint Tomography[J],2020,47(12).
APA	Wang K.,Jiang C.,Yang Y.,Schulte-Pelkum V.,&Liu Q..(2020).Crustal Deformation in Southern California Constrained by Radial Anisotropy From Ambient Noise Adjoint Tomography.Geophysical Research Letters,47(12).
MLA	Wang K.,et al."Crustal Deformation in Southern California Constrained by Radial Anisotropy From Ambient Noise Adjoint Tomography".Geophysical Research Letters 47.12(2020).