Crust and mantle beneath western Himalaya, Ladakh and western Tibet from integrated seismic data

Oreshin, Sergey; Киселев, С. В.; Vinnik, Lev; Prakasam, K. S.; S., S.; Makeyeva, Larissa; Savvin, Yegor

doi:10.1016/j.epsl.2008.03.048

Cited by 78 publications

(51 citation statements)

References 53 publications

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“…The mantle transition zone thickness along the profile remains about 255 km, so it implies that a temperature variation is no more than 50°C within the MTZ. It is also deduced from this observation that the tectonic activity caused by the Indian-Asia collision is limited to the depths above 410 km, which is in agreement with the conclusions of Yuan (1997) [9], [6] and Oreshin (2008) [14] .…”

Section: Upper Mantle Discontinuitiessupporting

confidence: 89%

“…In addition, the discontinuities between 410 and Moho (such as the Gutenberg discontinuity, Lehmann discontinuity, etc.) are not discussed, because they are often smeared by the multiple reflection waves from shallow discontinuities and scattering phases [14]. For the CCP time to depth migration processing, all the Ps amplitudes on each P receiver function are back projected along the ray path onto their true spatial locations of the conversion points.…”

Section: Methodsmentioning

confidence: 99%

“…As the 410 and 660 have opposing Clapeyron slopes, a temperature increase across the MTZ would result in thinning of the MTZ and vice versa. The arrival time difference between P660s and P410s determines the mantle transition zone thickness, and 1s anomaly corresponds to about a 100°C temperature change and a 10 km thickness change [6,14].…”

Section: Upper Mantle Discontinuitiesmentioning

confidence: 99%

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Moho offset beneath the central Bangong-Nujiang suture of Tibetan Plateau

Zhao

Cui

et al. 2009

Chin. Sci. Bull.

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By analyzing teleseismic waveforms recorded by 53 stations of Hi-Climb profile passing through the central Bangong-Nujiang suture (BNS), a total of 4764 high-quality receiver functions are obtained. The average crustal thickness and Poisson's ratio beneath each station are estimated using the travel time of Ps and PpPs of the Moho. The discontinuities such as the Moho, the 410-and 660-km interfaces are also studied using the common converted points (CCP) time to depth migration of receiver functions. The main results are as follows: (1) The Moho of Lhasa terrane and that of Qiangtang terrane nearby BNS are overridden and offset by ~10 km. The structural geometry shows a northward uplifting and the southward deepening for the Moho of Lhasa terrane and Qiangtang terrane, respectively, which is related to the reactivated structure beneath BNS since Cenozoic era. (2) The variation range of Poisson's ratios along the profile is between 0.237 and 0.280, indicating that the crust is mainly composed of felsic and intermediate rocks. The anti-correlation between the crustal thickness and Poisson's ratio suggests that thicker crust beneath the southern Qiangtang terrane may be related to the successive thrust of felsic and intermediate rock of Lhasa terrane. (3) The thickness of the mantle transition zone along the profile remains about 255 km, implying that the tectonic activities caused by the India-Asia collision are confined to the depths above 410 km. P receiver function, Moho offset, CCP time to depth migration, upper mantle discontinuity, Bangong-Nuiang suture Citation: Xu Q, Zhao J M, Cui Z X, et al. Moho offset beneath the central Bangong-Nujiang suture of Tibetan Plateau.

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Section: Upper Mantle Discontinuitiessupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Upper Mantle Discontinuitiesmentioning

confidence: 99%

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Moho offset beneath the central Bangong-Nujiang suture of Tibetan Plateau

Zhao

Cui

et al. 2009

Chin. Sci. Bull.

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“…1) (e.g., McNamara et al, 1994;Sandvol et al, 1997;Huang et al, 2000;Gao and Liu, 2009;Chen et al, 2010;Zhao et al, 2010;Zhao et al, 2014a). In western Tibet, which is the focus of this study, the majority of the fast orientations from previous studies are E-W or NE-SW (Oreshin et al, 2008;Levin et al, 2008;Zhao et al, 2010), with rapid lateral variations (Fig. 1).…”

Section: Introductionmentioning

confidence: 95%

“…1). Large (1.5 s) splitting times with E-W or NE-SW station-averaged fast polarization orientations are frequently found north of this boundary, while small or zero (null mea- (Levin et al, 2008;Oreshin et al, 2008;Zhao et al, 2010. The rest are from http://splitting.gm.univ-montp2.fr/DB/public/searchdatabase.html).…”

Section: Introductionmentioning

confidence: 98%

Complex seismic anisotropy beneath western Tibet and its geodynamic implications

Zhang

Kong

et al. 2015

Earth and Planetary Science Letters

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P wave velocity structure below India and Tibet incorporating anisotropic delay time effects

Mohanty

Singh

O'Driscoll

et al. 2016

Geochem Geophys Geosyst

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We incorporate the effects of anisotropy to refine the continental‐scale 3‐D isotropic velocity model previously produced for India and Tibet by inverting 52,050 teleseismic P wave residuals. We have exploited a total of 1648 individual SKS splitting parameters to calculate the P wave travel time corrections due to azimuthal anisotropy. Our results suggest that anisotropy affects the P wave delays significantly (−0.3 to +0.5 s). Integration of these corrections into the 3‐D modeling is achieved in two ways: (a) a priori adjustment to the delay time vector and (b) inverting only for anisotropic delays by introducing strong damping above 80 km and below 360 km depths and then subtracting the obtained anisotropic artifact image from the isotropic image, to get the corrected image. Under the assumption of azimuthal anisotropy resulting from lattice preferred orientation (LPO) alignment due to horizontal flow, the bias in isotropic P wave tomographic images is clear. The anisotropy corrected velocity perturbations are in the range of ±1.2% at depths of around 150 km and reduced further at deeper levels. Although the bias due to anisotropy does not affect the gross features, it does introduce certain artifacts at deeper levels.

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Crust and mantle beneath western Himalaya, Ladakh and western Tibet from integrated seismic data

Cited by 78 publications

References 53 publications

Moho offset beneath the central Bangong-Nujiang suture of Tibetan Plateau

Moho offset beneath the central Bangong-Nujiang suture of Tibetan Plateau

Complex seismic anisotropy beneath western Tibet and its geodynamic implications

P wave velocity structure below India and Tibet incorporating anisotropic delay time effects

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