Crustal seismic anisotropy in central Tibet: Implications for deformational style and flow in the crust

Geophysical Research Letters

Volumn 31, Issue 23, 2004, Pages 1-4

  Ozacar, A Arda ^a,b   Zandt, George ^a  

^a University of Arizona   (United States)

^b MIDDLE EAST TECHNICAL UNIVERSITY   (Turkey)

Author keywords

7205 Seismology: Continental crust (1242); 7260 Seismology: Theory and modeling; 8102 Tectonophysics: Continental contractional orogenic belts; 8159 Tectonophysics: Rheology Crust and lithosphere; 9320 Information Related to Geographic Region: Asia

Indexed keywords

ANISOTROPY; CORRELATION METHODS; DEFORMATION; MATHEMATICAL MODELS;

AZIMUTHAL VARIATIONS; CRUSTAL SHORTENING; DIPPING LAYERS; GLOBAL MINIMIZATION TECHNIQUES;

SEISMOLOGY;

CRUSTAL DEFORMATION; MOHO; RHEOLOGY; SEISMIC ANISOTROPY;

ASIA; CHINA; EASTERN HEMISPHERE; EURASIA; FAR EAST; WORLD; XIZANG;

MOHO;

EID: 16644397477     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/2004GL021096     Document Type: Article

References (22)

1. Ammon, C. J., G. E. Randall, and G. Zandt (1990), On the nonuniqueness of receiver function inversions, J. Geophys. Res., 95, 15,303-15,319.
2. Barazangi, M., and J. Ni (1982), Velocities and propagation characteristics of Pn and Sn beneath the Himalayan Arc and Tibetan Plateau: Possible evidence for underthrusting of Indian continental lithosphere beneath Tibet, Geology, 10, 179-185.
3. Burdick, L. J., and C. A. Langston (1977), Modeling crustal structure with converted phases in teleseismic body-waveforms, Bull. Seismol. Soc. Am., 67, 677-691.
4. Erickson, J. (2002), Anisotropic crustal structure inversion using a niching genetic algorithm: A feasibility study, M.S. thesis, Univ. of Ariz., Tucson.
5. Frederiksen, A. W., and M. G. Bostock (2000), Modeling teleseismic waves in dipping anisotropic structures, Geophys. J. Int., 141, 401-412.
6. Frederiksen, A. W., H. Folsom, and G. Zandt (2002), Neighborhood inversion of teleseismic Ps conversions for anisotropy and layer dip, Geophys. J. Int., 155, 200-212.
7. Huang, W., et al. (2000), Seismic polarization anisotropy beneath the central Tibetan Plateau, J. Geophys. Res., 105, 27,979-27,989.
8. Kind, R., et al. (2002), Seismic images of crust and upper mantle beneath Tibet: Evidence for Eurasian plate subduction, Science, 298 1219-1221.
9. Langin, W. R., L. D.. Brown, and E. A. Sandvol (2003), Seismicity of central Tibet from project INDEPTH III seismic recordings, Bull. Seismol. Soc. Am., 93, 2146-2159.
10. Levin, V., and J. Park (1998), P-SH conversions in layered media with hexagonally symmetric anisotropy: A cookbook, Pure Appl. Geophys., 151, 669-697.
11. Ligorria, J. P., and C. J. Ammon (1999), Iterative deconvolution and receiver-function estimation, Bull. Seismol. Soc. Am., 89, 1395-1400.
12. McNamara, D. F., et al. (1994), Shear wave anisotropy beneath the Tibetan Plateau, J. Geophys. Res., 99, 13,655-13,665.
13. Ross, A. R., et al. (2004), Deep reflection surveying in central Tibet: Lower crustal layering and crustal flow, Geophys. J. Int., 156, 115-128.
14. Rumpker, G., and T. Ryberg (2000), New "Fresnel-zone" estimates for shear-wave splitting observations from finite-difference modeling, Geophys. Res. Lett., 27(13), 2005-2008.
15. Sambridge, M. (1999), Geophysical inversion with a neighborhood algorithm: I. Searching a parameter space, Geophys. J. Int., 138, 479-494.
16. Shipiro, N., et al. (2004), Thinning and Flow of Tibetan crust constrained by seismic anisotropy, Science, 305, 233-236.
17. Sherrington, H. F., G. Zandt, and A. Frederiksen (2004), Crustal fabric in the Tibetan Plateau based on waveform inversions for seismic anisotropy parameters, J. Geophys. Res., 109, B02312, doi:10.1029/ 2002JB002345.
18. Taylor, M., et al. (2003), Conjugate strike-slip faulting along the Bangong-Nujiang suture zone accommodates coeval east-west extension and north-south shortening in the interior of the Tibetan Plateau, Tectonics, 22(4), 1044, doi:10.1029/2002TC001361.
19. Tilmann, F., J. Ni, and INDEPTH III Seismic Team (2003), Seismic imaging of the downwelling Indian lithosphere beneath central Tibet, Science, 300, 1424-1427.
20. Weiss, T., et al. (1999), Seismic velocities and anisotropy of the lower continental crust: A review, Pure Appl. Geophys., 156, 97-122.
21. Yin, A., and T. M. Harrison (2000), Geologic evolution of the Himalayan-Tibetan orogen, Annu. Rev. Earth Planet. Sci., 28, 211-280.
22. Zhao, W., et al. (2001), Crustal structure of central Tibet as derived from project INDEPTH wide-angle seismic data, Geophys. J. Int., 145 486-498.