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新疆乌恰地处印度洋板块向北楔入的尖角与欧亚板块碰撞的接合部位,构造运动强烈,是地震活动十分活跃的地区。该地区1949年以来发生过三次M_((?))≥7.0级大震,即1955年4月15日7.0级地震(双主震),1974年8月11日7.3级地震和1985年8月23日7.4级地震。对比分析震中区及邻近地区的历年气象资料与震前的资料发现,震中区震前的某些气象因素存在明显异常;同时,三次大震都发生在太阳黑子活动周期的低值年份。因此环境因子与大震之
Xinjiang Wuqia is located in the junction of the sharp wedge of the Indian Ocean plate north wedged with the Eurasian plate and strongly tectonic movement. It is an area where seismic activity is very active. Three M 7.0 large earthquakes occurred in the area since 1949, namely the 7.0 magnitude earthquake (double major) on April 15, 1955, the 7.3 magnitude earthquake on August 11, 1974 and the August 1985 earthquake On the 23rd the magnitude 7.4 earthquake. Comparing the historical meteorological data of the epicenter area and its adjacent areas with the data before the earthquake, it is found that some meteorological factors exist obviously before the epicenter epicenter; meanwhile, all three major earthquakes occur in the low value year of the sunspot activity period. Therefore, environmental factors and the earthquake