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以中期空区（孕震空区）图象为背景,在应变释放加速后转平的基础上,逐步缩小时空强三维轴向扫描窗长和步长,从多维空间探索强震进入短期阶段空区的特征及判据指标,提出了通过时空强三维轴向稳定性检验确定空区的新方法,通过对华北和西南地区26个震例的研究分析,发现在孕震空区形成后期、强震前9～16个月,震源区附近出现一种有别于孕震空区的短期空区.这类空区一般持续4～7个月,震前3～8个月结束,结束的标志往往是空区内部或边缘出现显著地震,空区内出现小震活动.
Based on the image of the meso-seismic zone (SEZ), on the basis of accelerating strain relief and leveling-off, the spatial and temporal 3D scanning window length and step length are gradually reduced and the strong earthquakes are explored from the multi-dimensional space into the short-term stage This paper presents a new method to determine the empty area by means of space-time strong three-dimensional axial stability test. By analyzing and analyzing 26 earthquake cases in North China and Southwest China, it is found that in the late period of strong earthquake, 9 to 16 months before the earthquake, there is a short-term empty area near the source area that is different from the pregnant vacant area, which normally lasts 4 to 7 months, ends 3 to 8 months before the earthquake and ends the mark Often there are significant earthquakes within or near the empty area and small earthquakes within the vacant area.