Crustal and upper-mantle structure under the Tien Shan from surface-wave dispersion

Cotton, Fredrick W.; Avouac, Jean Philippe

doi:10.1016/0031-9201(94)90036-1

Cited by 24 publications

(16 citation statements)

References 15 publications

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“…The crustal thickness of the mountain root of 52.5 km, assumed in Models T and L, is close to those of 49 and 55 km used in their report. The horizontal width (w1 = 250 km) of the mountain root for the above models is slightly narrower than the significant crustal thickening area of 300 km (Burov et al, 1990;Cotton and Avouac, 1994). However, the configurations of the Tien Shan mountain in the present models and in those used by Pedersen et al (1998) are highly similar.…”

Section: Applicability Of Mountain Root Modelsmentioning

confidence: 56%

“…However, the configurations of the Tien Shan mountain in the present models and in those used by Pedersen et al (1998) are highly similar. It has been reported by Cotton and Avouac (1994) from observed Rayleigh wave dispersions that the regional models for the central and eastern Tien Shan have pronounced low-velocity layers in the crust and the upper mantle. The regional crustal and upper mantle structures were approximated by Models L, LL, LA, and LB.…”

Section: Applicability Of Mountain Root Modelsmentioning

confidence: 96%

“…So, several simulations were performed for crustal and upper mantle models with a LVZ different from Model L. Cotton and Avouac (1994) presented a regional model for the eastern Tien Shan from surface wave group velocity data. A pronounced LVZ in the lower crust and a second LVZ at depths below 100 km, with S-wave velocities around 3.3 and 4.3 km/s, respectively, are involved in their model.…”

Section: Effects Of the Lvzmentioning

confidence: 99%

“…For Model LA the LVZ exists merely in the lower crust whereas for Model LB it does in both the lower crust and the upper mantle. Physical parameters in the LVZ in the upper mantle, such as V p = 7.3789 km/s, V s = 4.3433 km/s, and ρ = 3.1012 Mg/m 3 (Cotton and Avouac, 1994), were used. For S-wave velocity in the lower crust, a V s of 3.5 km/s (Table 1) was used, which was assumed for Model L and is slightly higher than that reported by Cotton and Avouac (1994).…”

Section: Effects Of the Lvzmentioning

confidence: 99%

“…Physical parameters in the LVZ in the upper mantle, such as V p = 7.3789 km/s, V s = 4.3433 km/s, and ρ = 3.1012 Mg/m 3 (Cotton and Avouac, 1994), were used. For S-wave velocity in the lower crust, a V s of 3.5 km/s (Table 1) was used, which was assumed for Model L and is slightly higher than that reported by Cotton and Avouac (1994). Synthetic seismograms were calculated for these models for a Rayleigh wave incidence from the left, and the amplitude spectra at site 15 are shown in Fig.…”

Section: Effects Of the Lvzmentioning

confidence: 99%

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Oscillation of a mountain root structure due to a Rayleigh wave incidence

Yoshida

2014

Earth Planet Sp

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Spectral amplitudes of Rayleigh waves across a mountain root in the continental crust were studied by the use of the finite difference technique. The crust has a mountain root structure like that of the Tien Shan in China, and a maximum thickness of about 50 km. The waves are numerically simulated by implementing a plane Rayleigh wave incidence on the front of the mountain root structure. The spectral amplitudes of the vertical (W) component are shown to be strongly amplified by the mountain for periods from 20 to 50 s, with a maximum of about 7%, whereas those of the radial (U) component show a slight increase with an increase in period. For the mountain structure with small-scale low velocity zones (LVZ) in the bottom of the root and in the upper mantle, amplitudes of the Wcomponent are enriched at periods slightly longer than those for the structure without the LVZ. For the mountain structure with a double large-scale LVZ in the lower crust and the upper mantle, amplitudes of the W-component are extensively amplified over a wide range beyond 50 s. The period range from 20 to 50 s with high amplifications of the W-component for the mountain root structure with or without the LVZ is consistent with periods, in which the Rayleigh to Love wave conversion is dominant in observed surface waves across the Tien Shan mountains (Pedersen et al., 1998).

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Section: Applicability Of Mountain Root Modelsmentioning

confidence: 56%

Section: Applicability Of Mountain Root Modelsmentioning

confidence: 96%

Section: Effects Of the Lvzmentioning

confidence: 99%

Section: Effects Of the Lvzmentioning

confidence: 99%

Section: Effects Of the Lvzmentioning

confidence: 99%

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Oscillation of a mountain root structure due to a Rayleigh wave incidence

Yoshida

2014

Earth Planet Sp

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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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Denudation outpaced by crustal thickening in the eastern Tianshan

Charreau

Saint‐Carlier

Dominguez

et al. 2017

Earth and Planetary Science Letters

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International audienceThe modern high topography of the Tianshan resulted from the reactivation of a Paleozoic orogenic belt by the India/Asia collision. Today, the range exhibits tectonically active forelands and intermontane basins. Based on quantitative morphotectonic observations and age constraints derived from cosmogenic 10Be dating, single-grain post-infrared infrared stimulated luminescence (p-IR IRSL) dating and modeling of fault scarp degradation, we quantify the deformation in the Nalati and Bayanbulak intermontane basins in the central Eastern Tianshan. Our results indicate that at least 1.4 mm/yr of horizontal crustal shortening is accommodated within these two basins. This shortening represents over 15% of the 8.5 ± 0.5 mm/yr total shortening rate across the entire range at this longitude. This shortening rate implies that the Eastern Central Tianshan is thickening at a mean rate of ∼1.4 mm/yr, a rate that is significantly higher than the average denudation rate of 0.14 mm/yr derived from our cosmogenic analysis. This discrepancy suggests that the Tianshan range has not yet reached a steady-state topography and remains in a transient state of topographic growth, most likely due to limited denudation rates driven by the arid climate of Central Asia

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Crustal and upper-mantle structure under the Tien Shan from surface-wave dispersion

Cited by 24 publications

References 15 publications

Oscillation of a mountain root structure due to a Rayleigh wave incidence

Oscillation of a mountain root structure due to a Rayleigh wave incidence

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

Denudation outpaced by crustal thickening in the eastern Tianshan

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