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选取了1966年以来云南地区22个MS≥6.0震例的地震影响场和余震序列,对两者的关联度进行空间统计分析。将余震分级后按2小时递增进行时段划分,然后用一元线性回归方法对各组余震数据进行线性模型回归。采用自变量极值法控制回归直线的范围,将得到的回归线段中点判定为宏观震中,线段方向判定为影响场方向。结果表明:此方法判定的结果总体上比较接近各震例的宏观震中和影响场方向。
The seismic influence field and aftershock sequence of 22 MS≥6.0 earthquakes in Yunnan since 1966 are selected, and the correlation between the two is statistically analyzed. After the aftershocks were classified, the periods were divided by 2 hours and then linear regression was performed on the aftershocks data of each group by the method of univariate linear regression. Using the extreme value of independent variables to control the range of the regression line, the midpoint of the regression line segment obtained is determined as the macro epicenter, and the direction of the line segment is determined to affect the field direction. The results show that the results of this method are generally close to the macro epicenter and the influence field direction of each earthquake case.