Is the Asian lithosphere underthrusting beneath northeastern Tibetan Plateau? Insights from seismic receiver functions

Shen, Xuzhang; Yuan, Xiaohui; Liu, Mian

doi:10.1016/j.epsl.2015.07.041

Cited by 44 publications

(24 citation statements)

References 51 publications

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“…In general, the Moho depth is coupled with the topography in two ways: (1) higher topography corresponds to deeper Moho; lower topography, shallower Moho; and (2) higher relief corresponds to more steeply dipping Moho, whereas low‐relief surface is underlain by more shallowly dipping Moho. This observation agrees with many previous studies that are based upon Pn wave (Xu & Song, ), P wave or S wave velocity (H. Y. Li et al, ; Lei & Zhao, ; Q. Y. Liu, van der Hilst, et al, ; C. Y. Wang et al, ), passive source seismic profiling (Z. J. Zhang et al, ), wide‐angle/deep seismic reflection profiles (Guo et al, ; S. X. Jia et al, ), and receiver functions (Hu et al, , ; Shen et al, , ), as well as those crustal models that are developed using joint inversion (Laske et al, ; Lou et al, ; X. Wang, Li, et al, ) and deep seismic sounding profiles (W. Wang, Wu, et al, ).…”

Section: Integration Of the Moho Structure With Topographysupporting

confidence: 91%

“…Although the latter techniques detect the Moho depths more accurately than the surface wave tomography does (Guo et al, 2013;Hu et al, 2018;S.X. Jia et al, 2014;Shen et al, 2011Shen et al, , 2015, they are largely restricted in a two-dimensional profile or a sparse point set. The Rayleigh wave tomography model by Wei et al (2017) is derived from seismic data that are collected from 160 stations located at intervals of 50-70 km deployed by the China Digital Seismic Network and several portable seismic arrays in the eastern TP and adjacent areas (L. Chen, 2006;Sandvol et al, 2008;X.…”

Section: Data and Workflowmentioning

confidence: 99%

“…Zhang et al, 2009), wide-angle/deep seismic reflection profiles (Guo et al, 2013; S. X. Jia et al, 2014), and receiver functions (Hu et al, , 2018Shen et al, 2011Shen et al, , 2015, as well as those crustal models that are developed using joint inversion (Laske et al, 2013;Lou et al, 2009;X. Wang, Li, et al, 2017) and deep seismic sounding profiles (W. .…”

Section: 1029/2018tc005239mentioning

confidence: 99%

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Three‐Dimensional Model of the Lithospheric Structure Under the Eastern Tibetan Plateau: Implications for the Active Tectonics and Seismic Hazards

Liu

et al. 2019

Tectonics

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Details of lithospheric structures in three‐dimensions (3‐D) are key to understanding the dynamics of crustal deformation and earthquakes in active orogenic systems. In this study, we develop a 3‐D model of the eastern Tibetan Plateau using the Skua‐Gocad software based on the latest Rayleigh wave tomography. We perform a quantitative modeling workflow to map the details of the Moho discontinuities and the high‐velocity anomalies. Then, we integrate the topography, major active faults, large earthquakes, and crustal Poisson's ratios to analyze the relationship between the shallow and deep structures of this region. Our study shows that the Moho is generally coupled with the topography. A steep Moho ramp exists under the plateau margin and its surface projection intersects the Longmen Shan (LMS) at a low oblique angle (~22°). Active deformation and large earthquakes are related to the steep Moho ramp under the plateau margin. Moreover, based on a 3‐D model of the Poisson's ratio perturbations, we find that deformation across the central LMS is characterized as a crocodile‐type wedge in the crust and lithospheric mantle, due to the resistance of the Yangtze craton and isostatic rebound. We suggest that a tectonic wedging model that contains both the upper‐crust thrusting and lower‐crustal thickening contribute to the LMS orogeny. Three‐dimensional visualization of the lithospheric structure is well suited to reveal the different levels of deformation and their relationships. Quantitative modeling methods provide effective constraints on the active blocks in the eastern Tibetan Plateau.

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Section: Integration Of the Moho Structure With Topographysupporting

confidence: 91%

Section: Data and Workflowmentioning

confidence: 99%

Section: 1029/2018tc005239mentioning

confidence: 99%

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Three‐Dimensional Model of the Lithospheric Structure Under the Eastern Tibetan Plateau: Implications for the Active Tectonics and Seismic Hazards

Liu

et al. 2019

Tectonics

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“…We collected the records of teleseismic events from 2001 to 2005 with magnitude greater than 5.5 and epicentral distances in the range of 30-908. Previous studies using the same data set have mapped the crustal thickness, Poisson's ratio, lithospheric structures, and the mantle transition zone discontinuities [Shen et al, 2011[Shen et al, , 2015. In this paper we explored the detailed crustal structures by closely visualizing both the RRFs and TRFs in the first 10 s time window.…”

Section: Receiver Functionsmentioning

confidence: 99%

Anisotropic low‐velocity lower crust beneath the northeastern margin ofTibetanPlateau: Evidence for crustal channel flow

Shen

Yuan

Ren

2015

Geochem Geophys Geosyst

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Detailed seismic structure in the crust beneath the northeastern margin of Tibetan Plateau was revealed by receiver functions of a regional permanent seismic network. At most stations, negative P-to-S converted phases can be detected in the radial receiver functions, prior to the Moho phases, indicating low velocities in the midlower crust. Prominent azimuthal variations in the transverse receiver functions with polarity reversal suggest azimuthal anisotropy in the crust. We used time variations of the P-to-S converted phases at the Moho in the radial receiver functions and the azimuth-weighted stacking of transverse receiver functions to determine the fast direction and magnitude of anisotropy. The low-velocity midlower crust with the coherent azimuthal anisotropy in the northeastern margin of Tibetan Plateau is consistent with the lower crustal channel flow model.

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“…In our 3‐D V SH model, a low velocity anomaly is observed in the midlower crust and can be traced down to uppermost mantle beneath the QOB (Figures d–g and ), consistent with the observations of slow P wave velocity (Lei & Zhao, ) and SV wave velocity (Li et al, , ), and inefficient propagation of high frequency Sn (Barron & Priestley, ). Additionally, a diffuse lithosphere asthenosphere boundary from S receiver function suggests small temperature gradient between mantle lithosphere and asthenosphere (Shen, Yuan, & Liu, ). These facts could indicate that the sub‐Moho upper mantle is weak and hot.…”

Section: Discussionmentioning

confidence: 99%

Lithospheric SH Wave Velocity Structure Beneath the Northeastern Tibetan Plateau From Love Wave Tomography

Xiao

2019

JGR Solid Earth

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The northeastern (NE) Tibetan plateau has been a prime site to understand the dynamic processes responsible for the rise and lateral growth of the Tibetan plateau. Here we construct a high‐resolution lithospheric scale isotropic SH wave velocity model (down to the depth of 130 km) for the NE Tibetan plateau and its adjacent regions based on the measurements of fundamental‐mode Love wave dispersions (20–100 s) with seismic data recorded by ChinArray II and China Digital Seismic Array using two‐plane wave method. Prominent slow SH wave velocity (VSH) is observed in the midlower crust of the NE Tibetan plateau, specifically in the Qilian Orogenic Belt and the Songpan‐Ganzi Terrane regions, coincident with previously indicated significantly slow SV wave velocity (VSV), probably implying the existence of partial melts in the midlower crust. This low SH wave velocity anomaly could be traced down to the uppermost mantle, indicating a weak and warm lithosphere, which we interpret as a consequence of asthenosphere upwelling after lithospheric mantle removal in the NE Tibetan plateau. The asthenosphere upwelling and associated deep‐seated thermal buoyancy could explain the occurrence of partial melting in the mid‐lower crust and account for parts of high elevations in the NE Tibetan plateau. The western Qinling orogenic belt is characterized with a high velocity anomaly in most of lithosphere, which is inconsistent with the existence of channel flow within the lithosphere along the Qinling orogenic belt from the Tibetan plateau.

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Is the Asian lithosphere underthrusting beneath northeastern Tibetan Plateau? Insights from seismic receiver functions

Cited by 44 publications

References 51 publications

Three‐Dimensional Model of the Lithospheric Structure Under the Eastern Tibetan Plateau: Implications for the Active Tectonics and Seismic Hazards

Three‐Dimensional Model of the Lithospheric Structure Under the Eastern Tibetan Plateau: Implications for the Active Tectonics and Seismic Hazards

Anisotropic low‐velocity lower crust beneath the northeastern margin ofTibetanPlateau: Evidence for crustal channel flow

Lithospheric SH Wave Velocity Structure Beneath the Northeastern Tibetan Plateau From Love Wave Tomography

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