【摘要】 研究了1996—2005年福建及邻区52次中小地震的震源机制和6组综合震源机制解,认为福建地区现今构造运动主要以拉张走滑运动为主,主压应力轴(P轴)总体为NW方向(300~320°)。其中,沿海地区,地震破裂以走滑运动为主;内陆地区,地震以正断性质为主。主压应力轴方向自北而南呈规则性变化,北部(闽江断裂带附近)主压应力轴方向主要为NNW向;南部闽粤交界附近主压应力轴方向为NWW至近EW方向。更多还原

【Abstract】 This paper analyzes the focal mechanism solutions of 52 medium-small earthquakes and 6 groups of composite focal mechanism solutions in Fujian region and its vicinities from 1996 to 2005.The conclusions are as follows:1)The major tectonic movement in Fujian is tensional strike slip;2)The maximum principal stress axis(P-axis)of Fujian is mainly in NW direction,300-320°;3)There are mainly strike slip earthquakes in the costal region,and normal fault earthquakes in the inland region;4)The P-axis directions change regularly from the north to south of Fujian region which are NNW in the north and NWW to near EW in the south.更多还原