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在地震学中长期预报的基础上 ,近几年地震学攻关指南的应用实践中发现 ,刻画强震前中小地震活动在时空分布上不均匀性的参量——地震非均匀度 ( GL值 )能较好地反映震前小震活动由稳定向非稳定过渡的中短期震兆特点。结合甘肃及邻区中强以上地震的预报研究 ,运用 GL值进行时空扫描 ,结果发现除个别省界边缘地区地震外 ,所有 5 .4级以上地震前 1～ 2 a,在震中 30 0 km范围内 ,2 .0级以上小震活动在不同时段均显示出明显的非均匀特性—— GL≥1 .0
Based on the long-term prediction of seismology, it has been found in application practice of seismological research guideline in recent years that the value of the seismic inhomogeneity (GL value), which characterizes the spatiotemporal distribution of small and medium earthquakes before the strong earthquakes Which can better reflect the short-term and short-term seismic trillion features of the small earthquakes before the earthquake from stable to unstable transition. Based on the prediction of moderate to strong earthquakes in Gansu and its adjacent areas, using GL values for space-time scanning, it is found that all the earthquakes outside the boundaries of individual provinces, 1-2 months before earthquakes of more than 5.4 magnitude and in the range of 30 0 km Within the period, the activity of small earthquakes above 2.0 level showed obvious non-uniform characteristics at different time periods - GL≥1 .0