Seismic mapping of crustal structures beneath the Indus‐Yarlung Suture, Tibet

Zhao, Wenjin; Mechie, J.; Guo, Jianqiu; Wenzel, Friedemann; Meißner, R.; Ratschbacher, Lothar; Steentoft, H.; Husen, Stephan; Brauner, H.-J.; Jiang, Dazhi; Frisch, Wolfgang; Hauff, Sigrid

doi:10.1046/j.1365-3121.1997.d01-7.x

Cited by 9 publications

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References 20 publications

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“…The ¢rst is the existence of bright spots, observed both in the seismic re£ection pro¢les (Makovsky et al 1996;Brown et al 1996) and by magnetotelluric surveying (Chen et al 1996). The existence of these bright spots was discussed by Zhao et al (1997) in terms of tectonics. The second result, which appears to be the cause of the bright spots, is evidence of partial melt in the middle crust, which may be related to the shortening of the Asian plate (Nelson et al 1996;Kind et al 1996;Reese & Ni 1996).…”

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confidence: 99%

Determination of the crustal structure in southern Tibet by dispersion and amplitude analysis of Rayleigh waves

et al. 1999

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Summary Surface waves recorded by the nine broad‐band stations of the INDEPTH II experiment are analysed to study the crustal structure of southern Tibet. Their frequency range is between approximately 0.015 and 0.050 Hz (i.e. between 20 and 60 s period). Phase velocity dispersion curves are calculated for the regions north and south of the Tsangpo suture, using Wiener filtering of fundamental mode Rayleigh waves incident upon the array with different backazimuths. The two dispersion curves are inverted to obtain the S‐wave crustal models north and south of the suture. They show that a low‐velocity layer is present in the lower crust north but not south of the Tsangpo suture. To confirm these findings, variations in the amplitudes of the Rayleigh waves across the suture are interpreted by numerical simulation. The strong amplitude variations at a 30 s period are reproduced using a model with a low‐velocity layer in the lower crust north of the suture, a normal high‐velocity layer to the south, and a sharp transition between these layers.

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