Abstract: The Quaternary tectonic stress states over the mentioned area and its relations to earthquakes are studied by combining the methods of geology, geomorphology. seismology and repeated levelling. Under the action of NEE-SWW trending horizontal principal compressional stress during the Quaternary period, the NW trending structure of this area was intensively upwarded and the EW trending faults suffered a tension-shear displacement leading to release the energy and to cause a series of smaller earthquakes, while the NS trending faults were characteristics of compression-shear displacement leading to release less energy and to cause scarcely minor earthquakes. At the intersection of the two faults mentioned above where the differential tectonic movement reached the maximum, has occurred an earthquake of 6 3/4 magnitude.

摘要： 本文用地质、地貌、地震等综合方法研究第四纪构造应力状态。本区第四纪主压应力为北东东—南西西方向。在这种应力作用下,区内南北向断裂呈压扭方式活动,东西向断裂以张扭方式活动,北西向构造强烈隆起。现今小震活动多沿东西向断裂分布。