Abstract

The existence of elastic anisotropy in the crust of the continental shelf adjoining the northwest Deccan Volcanic Province (DVP) is obtained through inversion of group velocities of Rayleigh and Love waves at periods of 5–80 s. An isotropic crustal model fairly explains the adjoining onshore surface-wave velocity data, but a radially anisotropic crust is necessary to explain similar data across the offshore region (continental shelf). The mean of SH and SV velocities in the anisotropic crust of the offshore region is close to the S-wave velocity of the isotropic crust of the adjoining onshore region. This shows that the elastic properties of the crustal layers were the same in the offshore and the adjoining onshore region, and the properties changed to radial anisotropy due to extensional tectonic deformation in the offshore region, which resulted in lattice-preferred orientation (LPO) of crystallographic axes of elastic anisotropic minerals. Results also indicate that the western trend of increasing trap thickness in DVP continues to the continental shelf.

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