In order to investigate the deep crustal structure across the mid-northern continental margin of the South China Sea(SCS),a wide-angle OBS profile(OBS2006-3) was simulated by using forward and inversion methods.This profile,319 km in length and NNW-SSE oriented crosses Dongsha Uplift,Chaoshan Depression,and deep oceanic basin.Fourteen Ocean Bottom Seismometers(OBS) was used in this survey.The velocity model reveals that the Mesozoic sediment in Chaoshan Depression is remarkably thick with maximum 8 km;and w...