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研制了一种新的高分辨率地震重定位方法(命名为:hypoRelocate)。该方法不仅用到传统的绝对走时和相对走时差约束,还加入了一种新约束——地震间的尾波互相关走时。该新方法利用模拟退火方法搜索地震事件群的上述三种约束总残差最小值,来求解地震事件的最佳位置和发震时刻。hypoRelocate方法通过加入尾波互相关走时拓展了相对走时对地震相对位置约束的优势,能够更高精度地确定地震相对位置,通过绝对走时信息的加入减小了重定位结果对原始地震目录位置的依赖。我们将该方法应用于中国芦山地震余震的重定位工作中。该方法的结果与另外一种重定位的hypoDD方法的结果的对比表明:尾波互相关走时和绝对走时的加入能够更好地约束地震的相对位置和绝对位置。
A new method of high-resolution seismic relocation (named hypoRelocate) has been developed. This method not only uses the traditional absolute travel time and relative travel time difference but also adds a new kind of constraint - the cross-correlation travel time of the wakes between the earthquakes. The new method uses the simulated annealing method to search the minimum value of the total residuals of the above three kinds of constraints in the earthquake event group to find the optimal location and the time of the earthquake events. The hypoRelocate method expands the advantage of the relative travel time constraints on the relative location of earthquakes by adding the cross-correlation of the coda wave, confirms the relative position of the earthquake with higher accuracy and reduces the dependence of the relocation result on the location of the original earthquake catalog by adding the absolute travel time information . We apply this method to the relocation of aftershocks in Lushan, China. Comparison of the results of this method with the results of another relocated hypoDD method shows that the relative and absolute locations of earthquakes can be better constrained by the addition of cochlear cross-correlation travel time and absolute travel time.