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Title: Fault slip and GPS velocities across the Shan Plateau define a curved southwestward crustal motion around the Eastern Himalayan syntaxis
Authors: Shi, Xuhua
Wang, Yu
Sieh, Kerry
Weldon, Ray
Feng, Lujia
Chan, Chung-Han
Liu-Zeng, Jing
Keywords: Global Positioning System (GPS)
Shan Plateau
Issue Date: 2018
Source: Shi, X., Wang, Y., Sieh, K., Weldon, R., Feng, L., Chan, C.-H., et al. (2018). Fault slip and GPS velocities across the Shan Plateau define a curved southwestward crustal motion around the Eastern Himalayan syntaxis. Journal of Geophysical Research: Solid Earth, 123(3), 2502-2518.
Series/Report no.: Journal of Geophysical Research: Solid Earth
Abstract: Characterizing the 700 km wide system of active faults on the Shan Plateau, southeast of the eastern Himalayan syntaxis, is critical to understanding the geodynamics and seismic hazard of the large region that straddles neighboring China, Myanmar, Thailand, Laos, and Vietnam. Here we evaluate the fault styles and slip rates over multi‐timescales, reanalyze previously published short‐term Global Positioning System (GPS) velocities, and evaluate slip‐rate gradients to interpret the regional kinematics and geodynamics that drive the crustal motion. Relative to the Sunda plate, GPS velocities across the Shan Plateau define a broad arcuate tongue‐like crustal motion with a progressively northwestward increase in sinistral shear over a distance of ~700 km followed by a decrease over the final ~100 km to the syntaxis. The cumulative GPS slip rate across the entire sinistral‐slip fault system on the Shan Plateau is ~12 mm/year. Our observations of the fault geometry, slip rates, and arcuate southwesterly directed tongue‐like patterns of GPS velocities across the region suggest that the fault kinematics is characterized by a regional southwestward distributed shear across the Shan Plateau, compared to more block‐like rotation and indentation north of the Red River fault. The fault geometry, kinematics, and regional GPS velocities are difficult to reconcile with regional bookshelf faulting between the Red River and Sagaing faults or localized lower crustal channel flows beneath this region. The crustal motion and fault kinematics can be driven by a combination of basal traction of a clockwise, southwestward asthenospheric flow around the eastern Himalayan syntaxis and gravitation or shear‐driven indentation from north of the Shan Plateau.
ISSN: 2169-9356
DOI: 10.1002/2017JB015206
Rights: © 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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