Abstract
Gravity profiles across the Himalayas and the Karakorum and Pamir ranges are analysed using the information available from deep seismic sounding studies. Generalized inversion of a profile along with conventional modelling using multiple bodies has provided several details of the subsurface crustal structure. The depth of the Moho varies from 58 km under the Himalayas to 71 km under the Karakorum, and rises to 55 km under the Pamir and the Trans-Alai. Beyond this, a depression of the order of 10–12 km is depicted under the Alai ranges. About 14–15 km above the Moho there is an interface which runs almost parallel to it through the entire section. The material between this interface and the Moho has a density which is higher (≈0.13 g/cm3) than the density of a typical continental lower crust and appears to represent the material underthrust from the Indian and the Eurasian plates.
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