【摘要】 本文对六安附近空区区域近期的地震活动性进行了分析,得出该区的地震活动趋于平静;判别孕震空区的两项指标逐渐趋于正常;其它一些地震活动性参数如波速比、b值、C值等和前兆观测未发现明显的趋势异常。讨论了该空区形成以及至今未发生中强震的实际演变过程,指出该空区形成是由于中强震后在同一地震带上的应力调整所引起的,有可能该空区因周围中强震的综合卸载作用而成为无震空区。更多还原

【Abstract】 This paper analyzed the recent seismicity in the seismic gap near Liuan. The result shows that the seismic activity in this area tends to quiescence; two criteria for distinguishing earthquake preparation gap are gradually becoming normal; no obvious tendency anomaly of some other seismicity parameters such as Vp/VS ratio, b-value, C-value and precursory observation are found. The formation and practical evolution course of this seismic gap without occurrence of moderately strong earthquakes so far are discussed. It is pointed out that the formation of this gap might be caused by the stress adjustment in the same seismic zone after the moderately strong earthquakes and this gap has turned into an aseismic gap possibly because the synthetic unloading effect of moderately strong earthquakes around.更多还原