Crustal structure of the North China Craton from teleseismic receiver function by the Common Conversion Point stacking method

895 teleseismic data recorded by the 35 stations located on North China Craton (NCC) as a line are used to calculate the receiver functions which are used to obtain the crustal structure under the stations installed on bedrock by H-kappa stacking method. The image of the crust along the 550 km-long profile is obtained by the common conversion point (CCP) stacking method using the crustal model calculated from the H-kappa stacking and the sedimentary structure calculated before. Because some stations are located on sediments, the size of the bin used in the CCP stacking is enlarged to strengthen the amplitude of the P to S conversion phases. Then the crustal structure of the Bohai Bay Basin (BBB) can be imaged by CCP stacking. The result shows that the crust thickness of the west NCC is much thicker than that of the east NCC. The thickness of the Western Block is about 45 km. The crustal thickness reduces to 43 km under the Luliangshan which may be the boundary between the Western Block and the Trans-North China Orogen (TNCO) in the depth of Moho. In the west of the North-South Gravity Lineament, the average crustal thickness is about 42 km while the Moho rises slightly under the Shanxi fault depression zone. There is a discontinuity under east of Datong Basin, which may be the channel of the mantle-derived material. In the North-South Gravity Lineament belt, the crustal thickness reduced obviously to 33 km. The average crustal thickness of the Bohai Bay Basin (BBB) is about 32 km, which is much thinner than the one of the Central Block. The Moho depth under the Jizhong depression is the shallowest, which can reach to 29 km in the thinnest area along the profile. The thick sedimentary layer corresponds to the thin crust, which can he explained by the extension of the basin.