利用由计算(?)、(?)综合地震图的最大振幅比与观测资料拟合的方法,计算出京津唐地区1986年4月至12月间,M_L≥2.5级的26个小震震源机制(见表1)。为直观起见,将机制解与主压应力轴方向分别绘于图1,图2中。图1中的黑色区域为张应力区,白色区域为压应力区。计算中所用速度模型见表2。 表1所列的仅仅是1986年里8个月内部分地震的结果,今后需连续处理与积累大量的小震资料以 By using the method of fitting the maximum amplitude ratio of the (?) And (?) Synthetic seismograms to the observed data, 26 focal earthquakes of M_L≥2.5 were calculated from April to December 1986 in the Beijing-Tianjin-Tangshan area Mechanism (see table 1). For the sake of intuition, the mechanism solution and principal compressive stress axis directions are plotted in Figure 1 and Figure 2, respectively. The black area in Figure 1 is the tensile stress area and the white area is the compressive stress area. The speed model used in the calculation is shown in Table 2. Table 1 shows only the results of some earthquakes within 8 months in 1986 and needs to continuously process and accumulate large amounts of small earthquakes in the future