福建街面水库现代构造应力场分析

The Present Tectonic Stress Field in Fujian Jiemian Reservoir Area

福建街面水库将于2006年底下闸蓄水,通过收集库区的地震震源机制解资料和本次工作得到的地震震源机制解结果,以及利用中小地震求解的综合震源机制解,本文分析了街面水库库区现代构造应力场特征:最大主压应力P轴为NW—SE方向,P轴倾角为23°;主张应力T轴为NE—SW方向,T轴倾角为3°。在这样的应力场中,主要以发生走滑型断裂运动性质的地震为主,同时还具有发生正断层运动性质的地震。

This paper collects and analyzes the data of focal mechanism solution from previous researchers as well as from our own study. Our results show that the present tectonic stress field in Jiemian reservoir area is characterized by the principal compressive stress axis in NW-SE direction with obliquity of 23°, and the principal tensile stress axis in NE-SW direction with obliquity of 3°. Under the condition of such tectonic stress field earthquakes will be very likely occur in strike slip faulting and tensile slip faulting mechanism.