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- Title
Diffuse Deformation in the SE Tibetan Plateau: New Insights From Geodetic Observations.
- Authors
Li, Zhangjun; Wang, Yang; Gan, Weijun; Fang, Lihua; Zhou, Renjie; Seagren, Erin G.; Zhang, Huiping; Liang, Shiming; Zhuang, Wenquan; Yang, Fan
- Abstract
The southeastern Tibetan Plateau is a key component in the India‐Eurasia collision zone, which is characterized by spatially prevalent strike‐slip fault systems with devastating earthquakes. However, slip rates on some of these faults are still poorly constrained, hindering an understanding of kinematic and dynamic processes in this region. We analyze contemporary crustal deformation in the SE Tibetan Plateau based on the latest, dense geodetic observations. Slip rates on a set of dextral NW/NNW‐striking faults are determined using a 3‐D elastic half‐space dislocation model. Our results show that boundary faults such as the Red River and Lancangjiang faults yield dextral slip rates ranging from 1 to 3 mm/a, similar to those of other small‐scale sub‐parallel faults such as the Chuxiong, Qujiang, and Wuliangshan faults. Additionally, sinistral slip of the Xiaojiang fault may have partly transferred to transpressional slip on the Qujiang, Jianshui, and central Red River faults, which increase seismicity on these faults. New seismic relocation results, geodetic measurements, and existing structural observations show the geometry of this dextral fault system at the depth, which may be restricted above or within the rheologically weak mid‐lower crust rather than cutting into the mantle. Results confirm that the SE Tibetan Plateau is characterized by on‐going diffuse deformation between the Sagaing and Xianshuihe‐Xiaojiang faults. Driven by the northward advance of the eastern Himalayan syntaxis and southward crustal extrusion, distributed right‐lateral movements occurred along the NW/NNW‐striking fault system. Key Points: A set of NW/NNW‐striking faults in the SE Tibetan Plateau yield dextral slip rates of 1–3 mm/a based on the latest geodetic observationsDextral movements of the NW‐/NNW‐striking faults could be caused by the northward indentation of the EHS and clockwise crustal extrusionThe SE Tibetan Plateau may have transitioned from localized to diffuse deformation in the mid‐late Miocene
- Subjects
GEODETIC observations; STRIKE-slip faults (Geology); EARTHQUAKES; KINEMATICS; EARTH'S mantle
- Publication
Journal of Geophysical Research. Solid Earth, 2020, Vol 125, Issue 10, p1
- ISSN
2169-9313
- Publication type
Article
- DOI
10.1029/2020JB019383