前震活动在时—空图形上分别形成“时—空”弯形平静区。
There was a bay-shaped quiet area of foreshocks for main shocks in a time-space diagram.
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；
The results show, the M_S4 earthquakes intensify 2 years before M_S7 earthquakes and the M_S4 earthquakes are quietude 1 year before M_S7 earthquakes are the main characteristics in Xinjiang.
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