【摘要】 为了解水口水库地区次级断裂的受力性质和活动特征,选用库区15个P波初动清晰可靠的地震震源机制解,采用力轴张量计算法推算了该区构造应力场的主轴方向,进而对断裂进行了应力分析。结果表明,湾口断裂受力性质为压性,其余为张性。根据库区布设的6个跨断层短水准场地观测资料,通过线性拟合方法,发现西瓜洲断裂为正断活动,其余为逆断活动。最后对两种方法得到的结果进行了比较。更多还原

【Abstract】 To understand the stress nature and activity characteristics of secondary faults in Shuikou reservoir area,with the focal mechanism data of 15 earthquakes which have clear and reliable P-wave first motions,we deduced the direction of principal axes of tectonic stress field in this area by using the algorithm of mechanical axis tensor,and then made stress analysis of the faults.The results show that the stress nature of only Wankou fault is compressive and the others are tensional.On the basis of cross-fault short-leveling data of 6 sites in the reservoir area,we found out,by using the linear fitting method,that the Xiguazhou fault moves normally and the other move reversely.Finally,the results with the two methods were compared and discussed.更多还原