摘要
The crustal structure and deep-shallow tectonic features of the Sanhe-Pinggu Earthquake (M8.0, 1679)Zone are explored by using a single-fold deep seismic reflection profile and a shallow seismic reflection profile. The results show that the crust beneath the investigated area is divided into upper and lower crust by a strong reflective zone at about 6~7 s TWT. The seismic reflection profile reveals that the deep fault in crust coincides well with the active fault in the shallow subsurface. Among all the faults, the deep fault has a larger dip angle, and it cuts the lower crust and crust-mantle transitional zone. The complex faults and crustal structures in deep and shallow are the tectonic background for Sanhe-Pinggu Earthquake, which controlled the earthquake activity in the area.