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分析了汶川8.0级地震前的地震空间长度的时空演变。在计算空间相关长度过程中采用长轴与孕震区主要断裂走向一致的椭圆型空间窗,并设计了优化程序。在本次特大地震前观测到了增长的地震空间相关长度。利用合成地震目录对结果进行了显著性检验,结果否定了零假设,表明观察到的模型不是由随机数据干扰造成的,这一观点的置信水平被证实为93.9%。
The temporal and spatial evolution of the seismic space length before the Wenchuan M 8.0 earthquake was analyzed. In the calculation of the spatial correlation length, the elliptical space window with the main faults and the main faults in the seismogenic zone is adopted, and the optimization procedure is designed. The correlation length of the increased seismic space was observed before the very large earthquake. A significant test of the results using synthetic seismograms resulted in a negation of the null hypothesis that the observed model was not caused by random data interference and the confidence level for this view was confirmed to be 93.9%.