Crustal velocity inhomogeneities along the Hirapur–Mandla profile, central India and its tectonic implications

摘要: Abstract Wide-angle seismic and gravity data across the Narmada-Son lineament (NSL) in central India are analyzed to determine crustal structure, velocity inhomogeneities hence constrain tectonics of lineament. We present 2-D structure from deep wide-angle reflection by using a ray-trace inverse approach. The main result study is delineation fault-bounded horst raised subsurface depth (∼1.5 km) Moho upwarp beneath NSL. crust below basement consists three layers with velocities 6.45–6.7, 6.2–6.5 6.7–6.95 km/s interface depths about 5.5–8.7, 14–17 18–23 km along profile. low-velocity (6.2–6.5 km/s) layer goes up 5 km becomes thickest part (∼13 km), while overlying high-velocity (6.45–6.7 km/s) thinnest (∼3 km) upper boundary lies at ∼1.5 km overall uncertainties various nodes order ±0.12 km/s ±1.40 km, respectively. up-lifted block up-warping NSL indicate that north south faults bounding deeply penetrated through which mafic materials mantle have been intruded into crust. Gravity modeling was also undertaken assess seismically derived features fill gap. lateral vertical heterogeneous nature cause instability blocks played an important role reactivation Narmada fault during 1997 Jabalpur earthquake.