Hales discontinuity in the southern Indian continental lithosphere: seismological and petrological models

We model the shear wave velocity structure of the Hales-discontinuity beneath the Eastern Dharwar Craton and Southern Granulite Terrain in Southern India using P-wave receiver function (P-RF) analysis and joint inversion with Rayleigh wave phase velocity dispersion. For this study we use data from seismological stations HYB, GBA and KOD. We isolated P-RFs where the Hales phase is distinct and model them using joint data analysis. We also use common conversion point stack profiles constructed by depth migrating P-RFs through the velocity model and show that the Hales discontinuity is undulatory in nature. We perform petrological modeling of the Hales discontinuity and fianlly propose a geodynamic model for its evolution.Â