Abstract: The Qixian-Xinxiang-Jiaozuo area is located at the southern section of the piedmont.fault belt of the Taihang mountain,which is one of main earthquake risk areas in China.In addition to geological structures and lithological characteristics,the condition of stress is also considered as one of essential factors for the occurrence of a strong earthquake.Recent tectonic stress state in this area has been studied by analysing recent activities of faults,ground water fluctuations and local mechanisms.From these studies the author suggests that recent regional tectonic stress fields are characterized by ENE-WSW horizontal principal compressional stress and NNW-SSE horizontal principal tensional stress.Recent tectonic stress state and its relation to seismicity have been studied by means of the finite element method.The calculations show that in the Xinxiang-Xiuwu complicated rhombic fault block,under the action of recent regional stress fields,the east and west acute angle region where two earthquakes of M=5.5 and M=6 have occurred is in a process of being highly stressed and may be a candidate of a strong earthquake.

摘要： 本文根据现今断裂活动特征、地下水活动、震源机制等资料初步研究了河南省淇县—新乡—焦作地区的现今构造应力状态。并结合有限元分析计算,初步探讨了应力状态与地震的关系。最后指出了该区有可能发生中强地震的构造部位。