Seismic stations (red triangles) and piercing points of Ps conversions at 350 km depth (black crosses), plotted on a colour coded tectonic map of India. SGT: Southern Granulite Terrane; CG: Closepet Granite; WDC: Western Dharwar craton; EDC: Eastern Dharwar craton; CB: Cuddapah Basin; DVP : Deccan volcanic province; NSL : Narmada Son Lineament; GG : Godavari Graben; BC : Bastar craton; CTB : Chattisgarh Basin; SC : Singhbhum craton; VNB : Vindhyan Basin; BUC : Bundelkhand craton; DAFB : Delhi Aravalli Fold Belt; SP : Shillong Plateau; MKH : Mikir Hills; MHR : Mahanadi Rift; CBR : Cambay Rift; MFT : Main Frontal Thrust; MBT : Main Boundary Thrust; MCT : Main Central Thrust; ITSZ : Indus Tsangpo Suture Zone; BNSZ : Bangong Nujiang Suture Zone; JSZ : Jinsa Suture Zone.