Shear wave splitting and mantle flow associated with the deflected Pacific slab beneath northeast Asia

Liu, Kelly H.; Gao, Stephen S.; Gao, Yuan; Wu, Ji

doi:10.1029/2007jb005178

Cited by 109 publications

(166 citation statements)

References 56 publications

(112 reference statements)

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“…The BJT and HNS restuls are consistent with the results obsevered by LUO et al (2004) and Liu et al (2008). However, our results at most stations are not consistent with the results Figure 3 Transverse energy contour of SKS splitting analysis at station JNX in Capital area from two teleseismic events (a) and (b), and the transverse energy contour of the result after stacking (c), where the asterisk denotes the position of optimal parameter pair obsvered by Zhao and Zheng (2005), the inconsistency is possibly due to different SKS splitting measurement techniques and different data processing and selection criteria used by the studies.…”

Section: Results and Analysissupporting

confidence: 82%

“…In western China, some scholars had conducted a series of researches on upper mantle anisotropy (LÜ et al, 1996;DING and ZENG, 1996;JIANG et al, 2001;WANG et al, 2007a;CHANG et al, 2006CHANG et al, , 2008. However, because of the insufficient data, the previous study of the upper mantle anisotropy in Capital area is preliminary (Zhao and Zheng, 2005;Liu et al, 2008;ZHENG and GAO, 1994;LUO et al, 2004). Since 2001, Capital Area Seismograph Network has accumulated a lot of broadband digital seismic data, which is greatly helpful to the seismological study on the upper mantle anisotropy and the related geodynamics in the study area.…”

Section: Introductionmentioning

confidence: 99%

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SKS splitting beneath Capital area of China

2008

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Based on the polarization analysis of teleseismic SKS waveform data recorded at 49 seismic stations in Capital Area Seismograph Network, the SKS fast-wave direction and the delay time between the fast and slow shear waves at each station were determined by using the grid searching method of minimum transverse energy and the stacking analysis method, and then we acquired the image of upper mantle anisotropy in Capital area. In the study area, the fast-wave polarization direction is basically WNW-ESE, and the delay time falls into the interval from 0.56 s to 1.56 s. The results imply that the upper mantle anisotropy in Capital area is mainly caused by the subduction of the Pacific plate to Eurasian plate. The subduction has resulted in the asthenospheric material deformation in Capital area, and made the alignment of upper mantle peridotite lattice parallel to the deformation direction. And the collision between the Indian and Eurasian plates made the crust of western China thickening and uplifting and material eastwards extruding, and then caused the upper mantle flow eastwards, and made the upper mantle deformation direction parallel to the fast-wave direction. The deformation model of the crust and upper mantle is possibly vertically coherent deformation by comparing the fast-wave polarization direction with the direction of lithospheric extension and the GPS velocity direction.

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Section: Results and Analysissupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

SKS splitting beneath Capital area of China

2008

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“…This thinning has been considered by some to be the result of subduction erosion [11]. Seismic anisotropy investigations of the upper mantle show that the time-delays of SKS splitting in the North China Basin are smaller than in the central and western parts of the uplift in neighboring parts of North China [12][13][14]. This evidence puts relative differences in lithosphere thickness in perspective.…”

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confidence: 96%

Crust-mantle coupling in North China: Preliminary analysis from seismic anisotropy

Gao

2010

Chin. Sci. Bull.

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Seismology) are compared with data from a temporary North China Seismic Array to obtain the background orientation of the horizontal crustal principal compressive stress at NE 95.1°±15.4° in North China. Data are corrected for disturbances of faults and irregular tectonics, and are used to constrain the fast SKS polarization at NE 110.2°±15.8° in North China. Individual station analyses suggests that there is consistently more than 10° difference between the polarizations of fast shear-wave in the crust and those of fast SKS phases. Azimuthally anisotropic phase velocities of Rayleigh waves at different periods also indicate an orientation change for fast velocity with depth. It suggests the crust-mantle coupling in North China follows neither the simple decoupling model nor the strong coupling model. Instead, it is possibly some inhomogeneous combination of two models or some gradual-change model of physical characteristics. This study shows that anisotropy in the crust and mantle could be multiply characterized more correctly and crust-mantle coupling could be analyzed further, if increasing near-field shear-wave splitting data that indicate crustal anisotropy, combined with the azimuthal anisotropy of Rayleigh waves, besides the result of SKS splitting travelling through lithosphere and surface GPS measurements. seismic anisotropy, crust-mantle coupling, polarization direction of fast shear-wave, shear-wave splitting, crustal principal compressive stress, North China Citation:Gao Y, Wu J, Yi G X, et al. Crust-mantle coupling in North China: Preliminary analysis from seismic anisotropy.

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“…V sub is the absolute velocity of the subducting plate, V t is the trench migration velocity, V up is the overriding plate velocity, V d is the deformation rate in the back-arc region, V c is the convergence velocity, a s is the shallow dip angle, and a d is the deep dip angle Earthq Sci (2016) 29(4):243-258 245 3 Seismic anisotropy data in subduction zones Schutt and Fouch (2001) and Wüstefeld et al (2009) collected and compiled seismic anisotropy data from different studies. Several researchers, including Wirth and Long (2010) and Liu et al (2008), also discussed the quality of the data in their studies. High-quality seismic anisotropy data generally have a high signal-to-noise ratio, a clear waveform, elliptical particle motion, and linear or nearly linear corrected particles.…”

Section: Subduction Zones and Dszsmentioning

confidence: 99%

Lattice-Preferred orientations of olivine in subducting oceanic lithosphere derived from the observed seismic anisotropies in double seismic zones

Han

Zhang

et al. 2016

Earthq Sci

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Subduction zones can generally be classified into Mariana type and Chilean type depending on plate ages, plate thicknesses, subduction angles, back-arc deformation patterns, etc. The double seismic zones (DSZs) in subduction zones are mainly divided into type I and type II which, respectively, correspond to the Mariana type and Chilean type in most cases. Seismic anisotropy is an important parameter characterizing the geophysical features of the lithosphere, including the subduction zones, and can be described by the two parameters of delay time dt and fast wave polarization direction /. We totally collected 524 seismic anisotropy data records from 24 DSZs and analyzed the statistical correlations between seismic anisotropy and the related physical parameters of DSZs. Our statistical analysis demonstrated that the fast wave polarization directions are parallel to the trench strike with no more than 30°for most type I DSZs, while being nearly perpendicular to the trench strike for type II DSZs. We also calculated roughly linear correlations that the delay time dt increases with dip angles but decreases with subduction rates. A linear equation was summarized to describe the strong correlation between DSZ's subduction angle a DSZ and seismic anisotropy in subduction zones. These results suggest that the anisotropic structure of the subducting lithosphere can be described as a possible equivalent crystal similar to the olivine crystal with three mutually orthogonal polarization axes, of which the longest and the second axes are nearly along the trench-perpendicular and trench-parallel directions, respectively.

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Shear wave splitting and mantle flow associated with the deflected Pacific slab beneath northeast Asia

Cited by 109 publications

References 56 publications

SKS splitting beneath Capital area of China

SKS splitting beneath Capital area of China

Crust-mantle coupling in North China: Preliminary analysis from seismic anisotropy

Lattice-Preferred orientations of olivine in subducting oceanic lithosphere derived from the observed seismic anisotropies in double seismic zones

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