南天山东段地震活动特征

分析研究了南天山地震带构造环境、中强地震活动震源机制解、中强地震时空分布以及拜城周围小震群活动与中强地震的关系。结果表明：南天山东段中强震震源断错以倾滑逆断为主，主压应力P轴由西到东呈扇形分布；相距较近的库车与拜城地区地震活动存在较大差异，但均存在明显的成丛性分布特点；拜城地区中强地震分布呈北西向可能预示着该区存在隐伏断裂，小震群活动则可能反映了局部中强震对周围次级小构造的影响。

THE CHARACTERISTICS OF SEISMIC ACTIVITY IN THE EAST OF SOUTH TIANSHAN MOUNTAIN

We analyzed and studied the structure environment, the epicenter mechanisms of medium-strong earthquakes, time and space distribution of medium-strong earthquakes and the relation between the small earthquakes clusters around Baicheng and medium-strong earthquakes in the seismic field of south Tianshan mountain. The result show, most of the medium-strong earthquakes faults are dip-slip reversed, distribution of the main stress P axis is sector from west to east; there are large difference between Kuche and Baicheng region in seismic activities, but the characteristic of cluster is same in the two region; the distribution of medium-strong earthquakes is NW direction in Baicheng region, it show, there can have a concealed fault; small earthquake clusters' activities can reflect the effect that local medium-strong earthquakes to the secondary small structure around it.