Uppermantle shear-wave splitting measurements in Mainland China: A review

Zhu, Tao; Ma, Xiang

doi:10.1016/j.earscirev.2020.103437

Cited by 12 publications

(6 citation statements)

References 216 publications

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“…The direction of the fast axis of the Ordos block is NE-SW in the north, while it turns to NW-SE in the south. At periods of 60-80 s (Figure 7e,f), the fast axis in the Ordos block seems to be parallel to the direction of the SKS/SKKS splitting [24,38] and the APM [39] (Figure 9). In the northeastern margin of the Tibetan plateau, the fast direction is NW-SE and parallel to the strike of the Qilian orogen (Figure 7), which is consistent with the azimuthal fast direction of the Ps and SKS/SKKS phases splitting [24,40].…”

Section: Azimuthal Anisotropymentioning

confidence: 99%

“…Combined with the previous hypotheses [12][13][14][15], that the thinning of the cratonic lithosphere in the eastern NCC resulted from slab rollback related to the subduction of the Paleo-Pacific plate, we further infer that the asthenospheric flow from the mantle upwelling of the Datong volcano also contributed to this thinning (Figure 10). [22,26,40] and at period 40 s vs. the SKS/SKKS phases splitting [24,38] (a) Distribution of Moho depth (after Li et al [50] and Xu et al [22,40]). The black arrows indicate the absolute plate motion (APM) direction of the GSRMv2.1 model [39].…”

Section: Lithospheric Thinning and Volcanism Of The Nccmentioning

confidence: 99%

“…Figure 9. Azimuthal anisotropy of Rayleigh wave at period 20 s vs. the Ps phase splitting of receiver function[22,26,40] and at period 40 s vs. the SKS/SKKS phases splitting[24,38] (a) Distribution of Moho depth (after Li et al[50] and Xu et al[22,40]). The black arrows indicate the absolute plate motion (APM) direction of the GSRMv2.1 model[39].…”

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confidence: 99%

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Deformation of the Crust and Upper Mantle beneath the North China Craton and Its Adjacent Areas Constrained by Rayleigh Wave Phase Velocity and Azimuthal Anisotropy

Zhang

Huang

et al. 2021

Remote Sensing

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The North China Craton (NCC) has experienced strong tectonic deformation and lithospheric thinning since the Cenozoic. To better constrain the geodynamic processes and mechanisms of the lithospheric deformation, we used a linear damped least squares method to invert simultaneously Rayleigh wave phase velocity and azimuthal anisotropy at periods of 10–80 s with teleseismic data recorded by 388 permanent stations in the NCC and its adjacent areas. The results reveal that the anomalies of Rayleigh wave phase velocity and azimuthal anisotropy are in good agreement with the tectonic domains in the study area. Low-phase velocities appear in the rift grabens and sedimentary basins at short periods. A rotation pattern of the fast axis direction of the Rayleigh wave together with a distinct low-velocity anomaly occurs around the Datong volcano. A NW–SE trending azimuthal anisotropy and a low-velocity anomaly at periods of 60–80 s are observed subparallel to the Zhangbo fault zone. The whole lithosphere domain of the Ordos block shows a high-phase velocity and counterclockwise rotated fast axis. The northeastern margin of the Tibetan plateau is dominated by a low-velocity and coherent NW–SE fast axis direction. We infer that the subduction of the Paleo-Pacific plate and eastward material escape of the Tibetan plateau mainly contribute to the deformation of the crust and upper mantle in the NCC.

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Section: Azimuthal Anisotropymentioning

confidence: 99%

Section: Lithospheric Thinning and Volcanism Of The Nccmentioning

confidence: 99%

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Deformation of the Crust and Upper Mantle beneath the North China Craton and Its Adjacent Areas Constrained by Rayleigh Wave Phase Velocity and Azimuthal Anisotropy

Zhang

Huang

et al. 2021

Remote Sensing

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“…and nearly E-W FVDs under the North China basin (Y Yang et al, 2018;T. Zheng et al, 2019;T. Zhu & Ma, 2021)…”

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confidence: 99%

Anisotropic Tomography and Dynamics of the Big Mantle Wedge

Liang

Zhao

et al. 2022

Geophysical Research Letters

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Active tectonics in NE Asia are characterized by large strike-slip faults, shallow and deep seismicity, intraplate volcanism, metamorphic core complex, and large-scale sedimentary basins. The subduction of the western Pacific plate (or the paleo-Pacific plate) has controlled the extensive deformation and volcanism in NE Asia since the late Cretaceous (Ward et al., 2021;Zhao, 2021). To date, many studies of global and regional tomography have revealed a flat stagnant slab in the mantle transition zone (MTZ) beneath East Asia, and the slab has reached

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“…These weak material regions are dominated by strongly positive radial anisotropy (V SH > V SV ), indicating that they are subjected by intense horizontal strain, which makes them possible to flow on a geological time scale. According to our model, the shear wave traveltime in a 120 km thick lithosphere is about 26.7 s (the average S-wave velocity is ~ 4.5 km/s) associated with the 4% anisotropy, then the traveltime delay between the fast and low S-wave is ~ 1.1 s. The average time delay of SKS wave splitting in the central-eastern part of North China is ~ 1.0 s with the NW–SE fast S-wave direction (Liu et al 86 ; Wang et al 87 ; Zhu and Ma 88 ), which support our claim of horizontal mantle flow. Moreover, GPS measurements show that the current crust of the North China region is moving in the direction of NW–SE (Wang et al 89 ), which is also the direction of subduction and retreat of the Western Pacific slab.…”

Section: Resultsmentioning

confidence: 99%

Adjoint traveltime tomography unravels a scenario of horizontal mantle flow beneath the North China craton

Dong

Yang

Niu

et al. 2021

Sci Rep

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The North China craton (NCC) was dominated by tectonic extension from late Cretaceous to Cenozoic, yet seismic studies on the relationship between crust extension and lithospheric mantle deformation are scarce. Here we present a three dimensional radially anisotropic model of NCC derived from adjoint traveltime tomography to address this issue. We find a prominent low S-wave velocity anomaly at lithospheric mantle depths beneath the Taihang Mountains, which extends eastward with a gradually decreasing amplitude. The horizontally elongated low-velocity anomaly is also featured by a distinctive positive radial anisotropy (VSH > VSV). Combining geodetic and other seismic measurements, we speculate the presence of a horizontal mantle flow beneath central and eastern NCC, which led to the extension of the overlying crust. We suggest that the rollback of Western Pacific slab likely played a pivotal role in generating the horizontal mantle flow at lithospheric depth beneath the central and eastern NCC.

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Uppermantle shear-wave splitting measurements in Mainland China: A review

Cited by 12 publications

References 216 publications

Deformation of the Crust and Upper Mantle beneath the North China Craton and Its Adjacent Areas Constrained by Rayleigh Wave Phase Velocity and Azimuthal Anisotropy

Deformation of the Crust and Upper Mantle beneath the North China Craton and Its Adjacent Areas Constrained by Rayleigh Wave Phase Velocity and Azimuthal Anisotropy

Anisotropic Tomography and Dynamics of the Big Mantle Wedge

Adjoint traveltime tomography unravels a scenario of horizontal mantle flow beneath the North China craton

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