地震活动性研究是探索地震发生规律、判断地震危险性研究中的重要手段之一。大部分强震前经常出现背景空区、中小地震增强活动、地震条带、地震平静等地震图像异常过程,这体现了强震孕育过程的阶段性特征。但在实际研究中,对地震空区和条带的确定及其演化特征分析存在一些不确定性和复杂的问题。根据强震发生前未来震源区周围存在地震活动增 Seismicity research is one of the important means to explore the law of earthquake occurrence and to judge the seismic hazard. Before most of the strong earthquakes, anomalous seismic images such as background empty zone, small and medium-sized earthquakes, seismic straps and seismic tranquility often occur, which shows the stage characteristics of the strong earthquakes. However, in the actual research, there are some uncertainties and complicated problems in the determination of seismic zones and bands and their evolution characteristics. According to the earthquake before the occurrence of seismic zone around the increase in seismic activity