2005年9月新疆克孜尔震群活动特征分析与震后趋势判定
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摘要
2005年9~10月新疆拜城县克孜尔地区发生5次4级地震,对该次震群活动的序列特征分析表明,这是一次非前兆性震群。震群中最大地震震源机制解和区域构造特征显示,本次震群的发生可能与克孜尔断裂活动有关。对比分析历史震群及其前后新疆及周边的地震活动后认为,本次震群附近短期内不大可能发生更大地震,但震群活动可能反映了新疆区域应力场增强,新疆及周边地区有发生中强以上地震的可能。
From Aug.to Oct.in 2005,Xinjiang Baicheng county of Kezier area occurred on 5 earthquake swarms with M4.The characteristics of swarm sequence activity indicated that it was non-omen earthquake swarms activity.In the earthquake swarms,the focal mechanism solution of the biggest earthquake and the regional structure characteristic showed that the occurrence of this swarms was possibly relation with Kezier fault activity.After contrasting and analyzing the historic swarms and seismic activity around Xinjiang and its peripheral region before and after the swarm,we thought that it is impossibly to occur on bigger earthquakes in short term nearby this swarms.However,the activity of earthquake swarms reflected possibly the stress field strengthens of the Xinjiang region.It is possible to occur on mid-strong earthquake in Xinjiang and its peripheral region.
From Aug.to Oct.in 2005,Xinjiang Baicheng county of Kezier area occurred on 5 earthquake swarms with M4.The characteristics of swarm sequence activity indicated that it was non-omen earthquake swarms activity.In the earthquake swarms,the focal mechanism solution of the biggest earthquake and the regional structure characteristic showed that the occurrence of this swarms was possibly relation with Kezier fault activity.After contrasting and analyzing the historic swarms and seismic activity around Xinjiang and its peripheral region before and after the swarm,we thought that it is impossibly to occur on bigger earthquakes in short term nearby this swarms.However,the activity of earthquake swarms reflected possibly the stress field strengthens of the Xinjiang region.It is possible to occur on mid-strong earthquake in Xinjiang and its peripheral region.
引文
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[3]倪明.克孜尔水库大坝震后检查与安全监测[J].大坝与安全,2003,5:9-11.
[4]赵瑞斌,杨主恩,周伟新,等.天山南北两侧山前坳陷带中新生代构造特征与地震[J].地震地质,2000,22(3):295-304.
[5]杨晓平,周本刚,李军,等.新疆南天山亚肯背斜晚更新世以来的隆起和缩短[J].地震地质,2001,23(4):501-509.
[6]沈军,吴传勇,李军,等.库车坳陷活动构造的总体特征[C]//地质力学专业委员会,第四纪专业委员会.青藏高原地质过程与环境灾害效应文集.北京:地震出版社,2005:132-139.
[7]张明利,谭成轩,汤良杰,等.塔里木盆地库车坳陷中新生代构造应力场分析[J].地球学报,2004,25(6):615-619.
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