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1975年1月15日康定、九龙发生6.2级地震已快十年,但至今尚未见到有关这次地震的总结。在测震前兆手段资料清理过程中,发现在该次地震之前,有多种地震活动图象变化,有必要系统地整理这次地震前的地震活动资料,分析震前弱震活动随时间及不同范围的变化特征。震前弱震活动图象的几个特征 1.震前震中附近Δ≤30公里弱震活动减弱,外围(30<Δ≤50公里)弱震活动频度增强。图1是在分析图2的基础上,给出了以1975
January 15, 1975 Kangding, Kowloon, 6.2 magnitude earthquake nearly ten years, but so far have not yet seen the summary of the earthquake. During the process of seismic data precalculation, it is found that there are many kinds of seismic activity images before this earthquake. It is necessary to systematically sort the seismic activity data before this earthquake, and to analyze the seismic activity before the earthquake with time and different range The changing characteristics. The features of the weak earthquakes before the earthquake 1. Weakened earthquakes with Δ≤30 km near the epicenter before the earthquake weakened and the frequency of the weak earthquakes at the periphery (30 <Δ≤50 km) increased. Figure 1 is based on the analysis of Figure 2, given in 1975