Shear wave splitting across the Ailao Shan-Red River fault zone, SW China

2007 ◽  
Vol 34 (20) ◽  
Author(s):  
Zhouchuan Huang ◽  
Liangshu Wang ◽  
Mingjie Xu ◽  
Jianhua Liu ◽  
Ning Mi ◽  
...  
Keyword(s):  
Shear Wave ◽  
Fault Zone ◽  
Shear Wave Splitting ◽  
Red River ◽  
Sw China ◽  
Wave Splitting ◽  
Red River Fault

Upper‐Crustal Anisotropy of the Conjugate Strike‐Slip Fault Zone in Central Tibet Analyzed Using Local Earthquakes and Shear‐Wave Splitting

2019 ◽  
Vol 109 (5) ◽  
pp. 1968-1984 ◽  
Author(s):  
Chenglong Wu ◽  
Xiaobo Tian ◽  
Tao Xu ◽  
Xiaofeng Liang ◽  
Yun Chen ◽  
...  
Keyword(s):  
Shear Wave ◽  
Fault Zone ◽  
Shear Wave Splitting ◽  
Strike Slip ◽  
Fast Wave ◽  
Lithospheric Deformation ◽  
Crustal Anisotropy ◽  
Local Earthquakes ◽  
Wave Splitting ◽  
Central Tibet

Abstract Remarkable V‐shaped conjugate strike‐slip faults extend along the Bangong–Nujiang suture in central Tibet. Motions of these faults are considered to accommodate ongoing east–west extension and north–south contraction. Fabrics within the fault zone that are anisotropic to seismic waves can provide clues as to the unusual scale and style of lithospheric deformation. With the goal of determining the upper‐crustal anisotropy pattern in central Tibet, we measured shear‐wave splitting parameters (fast wave polarization direction and delay time) using waveforms generated by 194 local earthquakes recorded by 49 stations of the SANDWICH network. Stations located in eastern and western zones of the study area show anisotropy directions that agree well with the maximum horizontal compressive stress direction. The fast polarization directions at stations near active strike‐slip faults generally run parallel to the strikes of these faults. Pervasive inactive thrust faults caused by Cretaceous–Tertiary shortening in central Tibet also clearly correlate with the anisotropy detected at nearby stations. These results demonstrate that both local structures and stress contribute to upper‐crustal anisotropy in the region. Combining the new results with previous SKS‐wave splitting results and other seismic evidence, we propose that deformation in the upper crust is mechanically decoupled from that in the upper mantle, due to eastward middle‐lower crustal flow. This crustal flow causes basal shearing required for the formation of conjugate strike‐slip faults in central Tibet.

Analysis of shear wave splitting anisotropy in the Tres Virgenes Volcanic Complex, Baja California Sur, Mexico

Geothermics ◽  
2021 ◽  
Vol 94 ◽  
pp. 102115
Author(s):  
F. Chacón-Hernández ◽  
F.R. Zúñiga ◽  
J.O. Campos-Enríquez ◽  
J. Lermo-Samaniego ◽  
N. Jiménez-Méndez
Keyword(s):  
Shear Wave ◽  
Baja California ◽  
Shear Wave Splitting ◽  
Volcanic Complex ◽  
Baja California Sur ◽  
Wave Splitting

An Early Miocene Transition in deformation regime within the Red River Fault Zone, Yunnan, And its significance for Indo-Asian tectonics

1992 ◽  
Vol 97 (B5) ◽  
pp. 7159 ◽  
Author(s):  
T. Mark Harrison ◽  
Chen Wenji ◽  
P. H. Leloup ◽  
F. J. Ryerson ◽  
Paul Tapponnier
Keyword(s):  
Fault Zone ◽  
Red River ◽  
Early Miocene ◽  
Deformation Regime ◽  
Red River Fault
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