scholarly journals Initiation of Clockwise Rotation and Eastward Transport of Southeastern Tibet Inferred from Deflected Fault Traces and GPS Observations

2021 ◽  
Author(s):  
Weijun Gan ◽  
Peter Molnar ◽  
Peizhen Zhang ◽  
Genru Xiao ◽  
Shiming Liang ◽  
...  
Keyword(s):  
The Tibetan Plateau ◽  
Clockwise Rotation ◽  
Active Deformation ◽  
Crustal Thinning ◽  
Eastern Tibet ◽  
Southeastern Margin ◽  
Wide Scale ◽  
Red River Fault ◽  
Longmen Shan Thrust Belt ◽  
Gps Observations

Eastward transport and clockwise rotation of crust around the southeastern margin of the Tibetan Plateau dominates active deformation east of the Eastern Himalayan Syntaxis. Current crustal movement inferred from GPS measurements indicates ongoing distortion of the traces of the active Red River fault and the Mesozoic Yalong-Yulong-Longmen Shan thrust belt. By extrapolating current rates back in time, we infer that this pattern of deformation developed since 10.1 ± 1.5 Ma. This date of initiation is approximately synchronous with a suite of tectonic phenomena, both near and far, within the wide Eurasia/Indian collision zone, including the initiation of slip on the Ganzi-Yushu-Xianshuihe fault and crustal thinning and E-W extension by normal faulting on N-S−trending rifts in the plateau interior. Accordingly, the eastward movement of eastern Tibet and the clockwise rotation of that material seem to be local manifestations of a larger geodynamic event at ca. 10−15 Ma that changed the kinematic style and reorganized deformation not only on the plateau-wide scale, but across the entire region affected by the India/Eurasia collision. Convective removal of some or all of Tibet’s mantle lithosphere seems to offer the simplest mechanism for these approximately simultaneous changes.

scholarly journals Variations in Crustal and Uppermost Mantle Structures Across Eastern Tibet and Adjacent Regions: Implications of Crustal Flow and Asthenospheric Upwelling Combined for Expansions of the Tibetan Plateau

Tectonics ◽  
2019 ◽  
Vol 38 (8) ◽  
pp. 3167-3181 ◽  
Author(s):  
Chen Zheng ◽  
Ruiqing Zhang ◽  
Qingju Wu ◽  
Yonghua Li ◽  
Fengxue Zhang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
The Tibetan Plateau ◽  
Uppermost Mantle ◽  
Eastern Tibet ◽  
Asthenospheric Upwelling

Paleoseismic events on the Shuangshi-Dachuan fault of the seismic gap, Longmen Shan thrust belt, eastern margin of the Tibetan Plateau

2019 ◽  
Vol 169 ◽  
pp. 1-10 ◽  
Author(s):  
Chongjian Shao ◽  
Shao Liu ◽  
Yong Li ◽  
Rongjun Zhou ◽  
Shiyuan Wang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Seismic Gap ◽  
The Tibetan Plateau ◽  
Thrust Belt ◽  
Eastern Margin ◽  
Longmen Shan Thrust Belt

COSMIC GPS observations of topographic gravity waves in the stratosphere around the Tibetan Plateau

2016 ◽  
Vol 60 (1) ◽  
pp. 188-197 ◽  
Author(s):  
XuanYun Zeng ◽  
XiangHui Xue ◽  
XianKang Dou ◽  
Chen Liang ◽  
MingJiao Jia
Keyword(s):  
Tibetan Plateau ◽  
Gravity Waves ◽  
The Tibetan Plateau ◽  
Gps Observations

scholarly journals Evolution of the Yangtze River network, southeastern Tibet: Insights from thermochronology and sedimentology

Lithosphere ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 3-18
Author(s):  
Loraine Gourbet ◽  
Rong Yang ◽  
Maria Giuditta Fellin ◽  
Jean-Louis Paquette ◽  
Sean D. Willett ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Yangtze River ◽  
Middle Miocene ◽  
Strike Slip ◽  
The Tibetan Plateau ◽  
Fluvial Incision ◽  
Upper Yangtze River ◽  
Southeastern Margin ◽  
The Upper Yangtze River ◽  
Southeastern Tibet

Abstract We performed apatite and zircon (U-Th)/He dating on a granitic pluton that has been offset by ∼10 km by motion on the sinistral strike-slip Xiangcheng fault in SW Sichuan, SE Tibetan plateau, where the Shuoqu River incises a deep valley before joining the upper Yangtze River. Mean ZHe cooling ages range from 49.5 ± 2.2 Ma to 68.6 ± 6.0 Ma. Samples located above 3870 m yield mean apatite (U-Th)/He ages ranging from 30.6 ± 1.4 Ma to 40.6 ± 2.7 Ma, whereas samples at lower elevations range from 9.8 ± 1.3 Ma to 14.6 ± 2.7 Ma. In the same region, Cenozoic continental sediments are exposed on the flanks of deep valleys. They consist of unsorted conglomerates and sandstones that partly fill a paleotopography. The sediments were deposited during an episode of rapid sedimentation, followed by incision that varies between 0.5 and 1.2 km. Thermal and exhumational modeling of the granite thermochronometric data indicates rapid cooling during the middle Miocene that was likely related to fluvial incision. Our findings suggest that the upper Yangtze River and its tributary (Shuoqu) were connected by the middle Miocene. Our modeling also supports the idea that the exhumation pattern during the Cenozoic in the southeastern margin of the Tibetan Plateau is spatially and temporally heterogeneous.

Present GPS velocity field along 1999 Izmit rupture zone: evidence for continuing afterslip 20 yr after the earthquake

2020 ◽  
Vol 224 (3) ◽  
pp. 2016-2027
Author(s):  
Seda Özarpacı ◽  
Uğur Doğan ◽  
Semih Ergintav ◽  
Ziyadin Çakır ◽  
Alpay Özdemir ◽  
...  
Keyword(s):  
Spatial Density ◽  
Earthquake Hazards ◽  
Fault Creep ◽  
Active Deformation ◽  
Near Fault ◽  
Gps Survey ◽  
Gps Velocities ◽  
Gps Velocity Field ◽  
Gps Observations

SUMMARY In order to better assess earthquake hazards, it is vital to have a better understanding of the spatial and temporal characteristics of fault creep that occur on ruptured faults during the period following major earthquakes. Towards this end, we use new far-field GPS velocities from continuous stations (extending ∼50–70 km from the fault) and updated near-fault GPS survey observations, with high temporal and spatial density, to constrain active deformation along the Mw7.4, 1999 Izmit, Turkey Earthquake fault. We interpret and model deformation as resulting from post-seismic afterslip on the coseismic fault. In the broadest sense, our results demonstrate that logarithmically decaying post-seismic afterslip continues at a significant level 20 yr following 1999 Earthquake. Elastic models indicate substantially shallower apparent locking depths at present than prior to the 1999 Earthquake, consistent with continuing afterslip on the coseismic fault at depth. High-density, near-fault GPS observations indicate shallow creep on the upper 1–2 km of the coseismic fault, with variable rates, the highest and most clearly defined of which reach ∼12 mm yr−1 (10–15 mm yr−1, 95 per cent c.i.) near the epicentre between 2014–2016. This amounts to ∼half the long-term slip deficit rate.

A high-resolution Late Neogene geochemical record of the southeastern margin of the Tibetan Plateau: Constraints on Dali fault system activity and uplift of the Diancang Shan massif

2020 ◽  
Vol 195 ◽  
pp. 104335 ◽  
Author(s):  
Chunxia Zhang ◽  
Shihu Li ◽  
Xiaoyan Zhang ◽  
Pei Li ◽  
Chenglong Deng ◽  
...  
Keyword(s):  
High Resolution ◽  
Tibetan Plateau ◽  
Fault System ◽  
The Tibetan Plateau ◽  
System Activity ◽  
Late Neogene ◽  
Southeastern Margin

Research on Risk Level of Debris Flow in an Area

2014 ◽  
Vol 638-640 ◽  
pp. 2015-2018
Author(s):  
Qing Nian Yang ◽  
Shuai Tao Wu ◽  
Zhi Li
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Evaluation Method ◽  
Risk Level ◽  
The Tibetan Plateau ◽  
Adverse Conditions ◽  
Southeastern Margin ◽  
The Sichuan Basin ◽  
Original Vegetation ◽  
Steep Terrain

The research targets at the transition zone from the southeastern margin of the Tibetan Plateau to the Sichuan Basin; it is shown according to field survey: from 2008 to 2010, debris flow occurred twice, resulting in missing of two people, destruction on a lot of farmland and other serious disasters. Such the debris flows were because that the original vegetation was severely damaged after “5.12” earthquake, a lot of loose blocks were scattered in slopes and valleys, and also stimulated by abundant rainfall during rainy season, local steep terrain, as well as narrow valleys. The paper makes qualitative and quantitative evaluation on risk of debris flow within the region by single-valley debris flow risk evaluation method as proposed by Liu Xilin and Tang Chuan et al. it is shown from the results that the risk level H is 0.55, within scope of moderate risk. In case of any adverse conditions, debris flows may occur again.

scholarly journals Sandbox modeling of evolving thrust wedges with different preexisting topographic relief: Implications for the Longmen Shan thrust belt, eastern Tibet

2016 ◽  
Vol 121 (6) ◽  
pp. 4591-4614 ◽  
Author(s):  
Chuang Sun ◽  
Dong Jia ◽  
Hongwei Yin ◽  
Zhuxin Chen ◽  
Zhigang Li ◽  
...  
Keyword(s):  
Thrust Belt ◽  
Eastern Tibet ◽  
Sandbox Modeling ◽  
Longmen Shan Thrust Belt ◽  
Topographic Relief

scholarly journals Seismic Tomography of Eastern Tibet: Implications for the Tibetan Plateau Growth

Tectonics ◽  
2018 ◽  
Vol 37 (9) ◽  
pp. 2833-2847 ◽  
Author(s):  
Fengxue Zhang ◽  
Qingju Wu ◽  
Yonghua Li ◽  
Ruiqing Zhang ◽  
Lian Sun ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Seismic Tomography ◽  
The Tibetan Plateau ◽  
Eastern Tibet
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