Crustal thickness variations across the northern Tien Shan from teleseismic receiver functions

Bump, Hedwig A.; Sheehan, A. F.

doi:10.1029/98gl00516

Cited by 36 publications

(22 citation statements)

References 19 publications

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“…Their results show crustal thickness that average 42 km beneath the Kazakh Shield, increasing to about 60 km beneath the Tien Shan. Their model is in good agreement with gravity measurements and a simple model of crustal shortening that can be explained by an Airy lithospheric root (BUROV et al, 1990;BUMP and SHEEHAN, 1998). KOSAREV et al (1993) used teleseismic receiver functions to estimate the crustal structure beneath the Tien Shan east and west of the Talasso-Fergana fault.…”

Section: Introductionsupporting

confidence: 49%

Path-specific Velocity Structure of Western China from Surface-wave Dispersion

Ketter

Velasco

Ammon

et al. 2006

Pure appl. geophys.

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We develop one-dimensional (1-D) path-specific velocity models in western China using new Rayleigh and Love wave group and phase velocity dispersion measurements for 20 events in the region. The earthquakes were grouped into three geographic clusters from which we compute the average phase and group velocity dispersion. We invert the average dispersion curves simultaneously for 1-D shearvelocity models appropriate for the three central Asian paths, using three previous shear-velocity models as initial models. The models are validated by forward modeling waveforms of recent events. The crustal thickness beneath western China in the vicinity of the Lop Nor test site is 50-60 km and our velocity models are consistent with major geologic features (e.g., basins and mountain ranges) and previous structural models for this region.

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Section: Introductionsupporting

confidence: 49%

Path-specific Velocity Structure of Western China from Surface-wave Dispersion

Ketter

Velasco

Ammon

et al. 2006

Pure appl. geophys.

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“…Ambient noise tomography manifested low velocity within the mantle lid beneath the Tienshan orogenic belt (Li et al, 2012). Receiver function analyses showed a crustal thickness of ~60 km beneath the most parts of the Tienshan orogenic belt with variations of ~20 km under the adjacent platforms (Bump and Sheehan, 1998;Oreshin et al, 2002;Vinnik et al, 2004;Kumar et al, 2005). Tian et al (2010) suggested that the detached lithosphere may have descended to the bottom of the mantle transition zone and small-scale upwelling may have ascended from the lower mantle beneath the central Tienshan and adjacent regions.…”

Section: Introductionmentioning

confidence: 96%

Pn anisotropic tomography under the entire Tienshan orogenic belt

Zhou¹,

Lei²

2015

Journal of Asian Earth Sciences

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“…Many RF and tomography studies have been conducted on the Tien Shan region [e.g., Roecker et al , 1993; Kosarev et al , 1993; Chen et al , 1997; Bump and Sheehan , 1998; Xu et al , 2002; Vinnik et al , 2004; Kumar et al , 2005; Lei and Zhao , 2007]. The crustal thickness varies from 45–70 km in the Tien Shan to approximately 42 km in the southern Kazakh Shield [ Bump and Sheehan , 1998; Vinnik et al , 2004]. The thickness of the lithosphere is about 90 km underneath the Tien Shan, but it increases to 120 and 160 km beneath the Kazakh Shield and the Tarim Basin, respectively [ Oreshin et al , 2002; Kumar et al , 2005].…”

Section: Introductionmentioning

confidence: 99%

Mantle transition zone topography and structure beneath the central Tien Shan orogenic belt

Tian¹,

Zhao²,

Zhang³

et al. 2010

J. Geophys. Res.

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[1] In this study we calculated receiver functions (RFs) from teleseismic P waveforms recorded by stations of four seismic networks to determine the topography of the mantle transition zone (MTZ) beneath the central Tien Shan. We converted the RFs from the time domain to the depth domain and selected the depths of 410 and 660 km discontinuities after stacking the RFs in narrow raypath bins. To better determine the MTZ topography, we applied an updated RF method to invert the depth differences between the 410 and 660 km discontinuities in each RF for lateral depth variations of the two discontinuities. Using this approach, we detected several anomalies in the 410 and 660 km discontinuity depths beneath the central Tien Shan region. Extensive synthetic tests were carried out to confirm the main features of the result. Beneath the south and east of Lake Issyk-Kul, the 410 km discontinuity becomes shallower while the 660 km discontinuity becomes deeper, leading to a thicker MTZ with a lower temperature, possibly caused by pieces of thickened lithosphere dropping down to at least the bottom of the MTZ. Beneath the northwest of Lake Issyk-Kul, the 410 km discontinuity becomes deeper while the 660 km discontinuity becomes shallower, resulting in a thinner MTZ with a higher temperature, which may reflect a small-scale hot upwelling from the lower mantle.

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Crustal thickness variations across the northern Tien Shan from teleseismic receiver functions

Cited by 36 publications

References 19 publications

Path-specific Velocity Structure of Western China from Surface-wave Dispersion

Path-specific Velocity Structure of Western China from Surface-wave Dispersion

Pn anisotropic tomography under the entire Tienshan orogenic belt

Mantle transition zone topography and structure beneath the central Tien Shan orogenic belt

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