关键词: 邢台地震, 铲形断层, 滑脱构造, 发震断裂, 耦合关系

Abstract: The property and active age of the shallow listric faults in the epicentral areas are detected by the results of shallow and ultrashallow seismic prospecting in the epicentres of Xingtai M_s7.2 earthquake and M_s6.8 earthquake. It is suggested that the Xinhe fault(F₁) has not moved since Late Pleistocene epoch and the fault is not the earthquake generating fault. In addition, the paper discusses the deep and shallow construction patterns and their relation and it is affirmed that the earthquake generating faults are the high dip faults beneath the focus of the earthquakes in the light of the results of deep seismic reflection profiles and deep seismic sounding profiles in Xingtai area. The invading function of upper mantle magma produces additional stress field. Common effect of the additional stress field and regional tectonic stress field caused again the high dip fault action and the action caused Xingtai earthquakes. The earthquakes caused the motion of the shallow fault and surface material.

Key words: Xingtai earthquakes, Listric fault, Detachment structure, Earthquake generating fault, Coupling relation.