新疆中强震前地震活动空间演化研究

研究了新疆中强震前地震活动空间演化过程。结果表明:①新疆发生7级地震的主要地震活动特征是震前2年新疆4级地震增强,震前1年新疆4级地震平静;②新疆发生6级地震的主要地震活动特征是,在不同时段的增强背景下,构造带4级地震活动经历增强—平静过程,不同构造区震前3个月震源区的活动具有各自的特点;③对强震而言,地震活动不同阶段所表现出的特征与构造有较好的关联。4~5级地震的孕震影响范围远低于7级地震,地震活动的强弱更多的与所处的构造带相关,反映了区域应力场对不同量级地震的影响。

THE STUDY ON SPACE EVOLVEMENT OF SEISMIC ACTIVITY BEFORE MEDIUM-STRONG EARTHQUAKES IN XINJIANG

We study the space evolvement course of seismic activity before medium-strong earthquakes in Xinjiang. The results show, the Ms4 earthquakes intensify 2 years before Ms7 earthquakes and the Ms4 earthquakes are quietude 1 year before Ms7 earthquakes are the main characteristics in Xinjiang. The main characteristics of seismic activity before Ms6 earthquakes are the Ms4 seismic activity pass intensity-quietude course in the same tectonics under intensity background of different periods, the seismic activity are different in the earthquake region 3 months before Ms6 earthquakes in different tectonics. For strong earthquakes, the characteristics of different perods of seismic activity .are well relative with tectonics. The influence of Ms4- 5 earthquakes is lower than the Ms7 earthquakes, the seismic activity are relative with tectonics, it reflect the influence of regional stress field to the different magnitude earthquakes.