北天山西段中强震前中小地震活动特征讨论  

DISCUSSION ON MID-SMALL EARTHQUAKES ACTIVITY CHARACTERISTICS BEFORE MID-STRONG EARTHQUAKE IN THE WEST PART OF NORTHERN TIANSHAN MOUNTAIN

作　　者：邹广[1] 

机构地区：[1]新疆维吾尔自治区地震局温泉地震台,新疆温泉833500

出　　处：《内陆地震》2009年第4期482-489,共8页Inland Earthquake

摘　　要：通过对不同地震断裂带的地震活动趋势分析,对强震前中小地震的时空特征进行分析,对研究区域强震前的活动特征做了定性或定量的总结,以提高日后对地震预报的水平和可信度。北天山西段及准噶尔南缘地震断裂带及断裂带上中强震前地震活动有如下特征：（1）区域内断裂带多数在活动速率、结构都有比较详细的研究,喀什河断裂带活动速率较高,依连哈比尔尕断裂西段阿拉山口—精河段存在闭锁,准噶尔南缘成组断裂带1990年以来5级地震较活跃;（2）喀什河断裂、准噶尔南缘成组断裂中强震前3-4级地震地震活动图像特征明显,成条带、空区或在主震附近集中分布;（3）准噶尔南缘中强震有成组发生的特征,间隔一般不超过2年;（4）4级标志地震后半年内发生中强震的概率较大。Through analyzing earthquakes activity tendency,time-space charaeteristies of moderately small earthquakes before strong earthquakes, and doing qualitative and quantitative summary of strong earthquakes activity characteristies in the study area, the earthquake prediction level and reliability wouht be improved. The earthquakes activity characteristics before moderately strong earthquake in the study area are analyzed in the following ： （ 1 ） In the study area, the activity rate of Kashi river fauh was the highest and the lowest existed in the west part of Yilianhabierga fault. The Ms 5.0 earthquakes were active in the southern fault of Dzungarian Basin ; （2） There was obvious 3 to 4 earthquakes activity characteristics along Kashi river fault and southern fault of Dzungarian Basin. They formed seismie beh, seismic gap or gathered around the main earthquake ; （ 3 ） The moderately strong earthquakes occurred in group and the interval was not more than 2 years; （4）The possibility of moderately strong earthquake was bigger in 6 months after 4 sign earthquake.

关 键 词：北天山 断裂带 震中分布 中强震 地震活动性 

分 类 号：P315.7[天文地球—地震学]