INTERPRETATION OF THE FULIJI-FENGXIAN DSS PROFILE IN XIAYANGZI REGION
ZHANG SI-WEI ZHANG SOU-XI TANG RONG-YU LIANG ZHONG-HUA SONG WEN-RONG TANG JIAN-MING LIU JIAN-DA SONG JIAN-JUN(Seismological Bureau of Jiangsu, Nanjing)
The total length of the Deep Seismic Sound (DSS) profile of Fuliji-Fengxian is about 570 km. The static correction of the sedimentary layer had been made. It makes the results more reasonable and accurate. We separate the Pg wave from the head waves of basement and crystalline basement interface, and then, find their boundaries. These coincide with the geological data. The middle and lower crust are calculated in detail by the SEIS-83 program, and get the following results:1. The crust of Xiayangzi platform can be clearly divided into three layers (upper, middle, lower). The differences in each layers between this region and North China platform have been discussed.2. An interface in the middle crust in Xiayangzi region has been found. It may be produced from a high density layer or high velocity thin layer.3. No clear throw at the Moho discontinuity in the area of Tan-Lu fault has been found. It lies in the section of the upheaval batter of it. Perhaps there are some tension fractures in it.4. The complex folds in the upper palaeozoic, the volcano and the seismic zones may be related to the undulation of Moho discontinuity.