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本文根据新疆120年的地震资料,分析了北天山地区地震活动特征。 本区地震活动有A、B两大活动期和b、c、d、e四个活动段,每个活动段间隔约16～20年。地震活动主要集中在“两带一区”,它们各有自己的地震活动特点,较大地震有地震活动显著增强→地震活动相对减弱→震前平静→发震→震后平静的发展过程;还发现震前数年有孕震空区(或空段)出现,震前数月地震活动有异常条带分布的趋向。增强的地震活动往往呈丛集分布。该区有两个地震活动的“敏感”区域。 认识这些地震活动特性,对我们分析新疆地区的地震活动,研究大震的预报问题都有实际意义。
Based on 120 years of seismic data in Xinjiang, this paper analyzes the characteristics of seismic activity in the North Tianshan Mountains. Seismic activities in this area are A and B two active periods and b, c, d, e four activity segments, each activity interval of about 16 to 20 years. Seismic activities are mainly concentrated in the “two belts and one zone”, each of which has its own characteristics of seismic activity. Seismic activities are significantly enhanced in larger earthquakes → relatively weakened seismic activity → calm before earthquakes → seismogenic events → quiet development after earthquakes; It was found that there was a pregnant vacant zone (or empty segment) in the past few years before the earthquake and there was an anomaly distribution trend of the anomalous seismic activity in the previous few months before the earthquake. Increased seismic activity is often clustered. The area has two “sensitive” areas for seismic activity. Understanding the characteristics of these seismic activities is of practical significance for us to analyze seismic activities in Xinjiang and to study the prediction of large earthquakes.