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Title: Complex patterns of past and ongoing crustal deformations in Southern California revealed by seismic azimuthal anisotropy
Authors: Wu, Shucheng
Jiang, Chengxin
Schulte‐Pelkum, Vera
Tong, Ping
Keywords: Science::Geology
Issue Date: 2022
Source: Wu, S., Jiang, C., Schulte‐Pelkum, V. & Tong, P. (2022). Complex patterns of past and ongoing crustal deformations in Southern California revealed by seismic azimuthal anisotropy. Geophysical Research Letters.
Project: 04MNS001913A620 
Journal: Geophysical Research Letters 
Abstract: We present a high-resolution P-wave azimuthally anisotropic velocity model for the upper and middle crust beneath southern California by a novel adjoint-state traveltime tomography technique. Our model reveals significant anisotropy variations between tectonic blocks that clearly reflect both past and current plate boundary deformation. In the shallow crust, seismic anisotropy is mostly controlled by the preferred alignment of microcracks related to the present N-S compressive stress; while at deeper depths (> ∼6 km), seismic anisotropy mainly records paleofabrics formed during the long-lived Farallon subduction and later extension that have not been fully reset by the present transform motion. Interestingly, our model demonstrates distinct fast axes beneath the western Transverse Ranges from its neighboring blocks, probably reflecting the large-scale vertical axis clockwise rotation of the block. In addition, we identify layered structures with distinct anisotropy features beneath the Salton Trough, which could be a result of the current transtension.
ISSN: 0094-8276
DOI: 10.1029/2022GL100233
DOI (Related Dataset): 10.21979/N9/JQDOAQ
Schools: Asian School of the Environment 
School of Physical and Mathematical Sciences 
Research Centres: Earth Observatory of Singapore 
Rights: © 2022 American Geophysical Union. All rights reserved. This paper was published in Geophysical Research Letters and is made available with permission of American Geophysical Union.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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