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本文通过分析区域小震活动指出:博克图5.6级地震前,该区存在不同震级下限的围空区小震条带的分布与近代活动性构造基本吻合;5.6级地震发生前,应变释放加速,ML≥3.5级地震的频度上升,ML≤3.5地震的频度和b值下降是中短期异常的重要标志;前兆震群往往发生在孕震空区的边缘.
This paper analyzes the small earthquakes in the region and points out that the distribution of the small earthquakes in the airspace before the Borkou 5.6 M (subscript S) earthquake precedes that of the modern active structures before the 5.6 Mbuji earthquake. The magnitude of ML≥3.5 earthquakes rises, and the frequency of ML≤3.5 earthquakes and the decrease of b value are important signs of short-term anomalies. Precursory swarms often occur at the margin of the earthquake-affected areas.