Abstract

The upper mantle velocities of both the Indian Shield and Tibetan Plateau are constrained to a depth of 400 km by means of the travel times and waveforms of long-period SH waves recorded at distances of 10-30 deg, as well as some SS waveforms. S-wave travel times and waveforms, however, indicate that mean velocity at 70-250 km below the central and northern Tibetan Plateau is 4 percent or more slower than that below the Indian Shield. These results indicate that the structure of Tibet is not that of a shield, and imply that the structure of Tibet is not that of a shield, and imply that the Indian plate is not underthrusting the whole of the Tibetan Plateau at the present time.

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