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１９９９年１～６月，新疆境内及附近地区共发生ＭＳ４级以上地震２０次。其中５～５．９级地震７次；４～４．９级地震１３次；最大为３月１５日发生在库车的ＭＳ５．７级地震。５级地震活动明显高于历年平均水平。地震参数见表１。地震活动的主要特征表现为：１）５级地震主?
From January to June 1999, a total of 20 MS4 earthquakes occurred in and around Xinjiang. Of which 5 to 5.9 earthquakes 7 times; 4 to 4.9 earthquakes 13 times; the largest for March 15 in Kuqa MS5.7 earthquake. Grade 5 earthquakes were significantly above the historical average. Seismic parameters in Table 1. The main features of seismic activity are as follows: 1) Main earthquakes of magnitude 5