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Lithosphere and asthenosphere of the Tien Shan imaged by S receiver functions

Lithosphere and asthenosphere of the Tien Shan imaged by S receiver functions,10.1029/2001GL014441,Geophysical Research Letters,Serge Oreshin,Lev Vinn

Lithosphere and asthenosphere of the Tien Shan imaged by S receiver functions   (Citations: 20)
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The S receiver function technique was applied to the recordings from 36 broad-band stations in the Tien Shan. The results reveal a pronounced difference in the properties of the lithosphere-asthenosphere of the Tien Shan and those of the neighboring platforms. Beneath the Tien Shan, an upper-mantle lid with an S velocity of about 4.5 km/s is underlain at a depth of about 90 km by a low-velocity zone, where the S velocity drops to 4.1–4.2 km/s. Trends of P and S travel time residuals are consistent with the presence of melt or other liquids in this zone. There is no evidence of any similar layer beneath the platforms. The crust is 55–65 km thick beneath most of the Tien Shan and 45 km below the platforms, although it thins to about 45 km near the Naryn basin in the central Tien Shan.
Journal: Geophysical Research Letters - GEOPHYS RES LETT , vol. 29, no. 8, pp. 32-1-32-4, 2002
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    • ...The SRF technique has become an effective tool to map the uppermost mantle discontinuity in diverse tectonic regimes of the world [Oreshin et al., 2002; Li et al., 2004; Kumar et al., 2005b, 2006, 2007; Rychert et al., 2005, 2007; Sodoudi et al., 2006; Angus et al., 2006; Landes et al., 2007]...

    Prakash Kumaret al. Imaging the seismic lithosphere-asthenosphere boundary of the oceanic ...

    • ...In the last decade, resolution of the LAB has been improved with a variety of seismic data, including teleseismic phases such as Ps and Sp [Farra and Vinnik, 2000; Levin and Park, 2000; Li et al., 2000; Collins et al., 2001; Oreshin et al., 2002; Li et al., 2004; Rychert et al., 2005;Vinniketal.,2005;Kumaretal.,2005a, 2005b;Chenetal.,2006;Kumaretal.,2006;Mohsen etal.,2006;Sodoudietal.,2006;Hansenetal.,2007; Heit et al., 2007; Kumar et al., ...

    Christy B. Tillet al. A mechanism for low-extent melts at the lithosphere-asthenosphere boun...

    • ... imaging of discontinuities in the lithosphere-asthenosphere boundary depth range has also been accomplished using reflected teleseismic body wave phases [Revenaugh and Jordan, 1991; Revenaugh and Sipkin, 1994], and recently, progress has been made using Ps and Sp scattered phases [Bostock, 1998; Chen et al., 2006; Collins et al., 2001; Farra and Vinnik, 2000; Kumar et al., 2005a, 2005b, 2006; Li et al., 2000, 2004; Mohsen et al., 2006; Oreshin ...
    • ...complications due to reverberations from shallower discontinuities which are present in Ps data [Kumar et al., 2005b; Oreshin et al., 2002; Vinnik and Farra, 2002; Vinnik et al., 2003, 2004a, 2005b]...
    • ... in central eastern China (60–72 km depth) [Sodoudi et al., 2006], the region from the Dead Sea Transform (65–80 km depth) to eastern Turkey (90 km depth) and the Arabian Shield (160 km depth) [Mohsen et al., 2006], the central Himalayan-Tibetan orogen (160– 220 km depth) [Kumar et al., 2006], and the region from the Tien Shan orogenic belt (90–120 km depth) to the Pamir and Karakoram orogenic belts (120–270 km) [Kumar et al., 2005b; Oreshin et ...
    • ...Where a discontinuity in the 50–160 km depth range has been imaged using Sp scattered energy and the velocity gradient has also been modeled, the gradient has been strong, 6.9–8.9% [Oreshin et al., 2002; Vinnik et al., 2004a, 2005b], and as sharp as 21 km [Vinnik et al., 2005b]...
    • ...Similarly, Sp data in the Tien Shan suggest a strong discontinuity, a 6.7–8.9% drop in velocity that was assumed to occur as a single step function in depth [Oreshin et al., 2002]...

    Catherine A. Rychertet al. P-to-S and StoP imaging of a sharp lithosphere-asthenosphere boundary ...

    • ...We also note that our average crustal thickness may be on the high side when compared with the results of Oreshin et al. [2002]...
    • ...Based on their discovery of a thin mantle lid beneath this part of the Tien Shan through the analysis of Sp conversions, Oreshin et al. [2002] proposed that a locally strong upper mantle transfers stress from south to north, in essence acting like a miniature version of the Tarim Basin...
    • ...In this model, the thin lithospheric lid determined by Oreshin et al. [2002] is morelikelytobe aresultofthinning,eitherbydelaminationor siphoning to the east and west, than evidence of resistance to deformation...

    Yi Xuet al. Uppermost mantle structure and its relation with seismic activity in t...

    • ...The crustal thickness was estimated by P and S receiver functions to be 45–65 km in Tien Shan [Kosarev et al., 1993; Oreshin et al., 2002; Vinnik et al., 2004]...
    • ...The lithosphere is observed to be 90–110 km thick beneath Tien Shan [Oreshin et al., 2002]...
    • ...In Tien Shan the thickness of the lithosphere changes from east to west between 90 and 120 km. Vinnik et al. [2004] and Oreshin et al. [2002] observed below the Tien Shan a thinned mantle lid several tens of kilometers thick...

    P. Kumaret al. The lithosphere-asthenosphere boundary in the Tien Shan-Karakoram regi...

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