帕米尔东北侧中强地震前应力场动态变化特征分析
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摘要
依据乌恰、喀什和巴楚 3个台小震综合机制解资料 ,分析研究了帕米尔东北侧中强地震前震源区及其附近地区应力场的动态变化过程 .结果表明 :3个台小震综合机制解的P轴方位各自存在较明显的优势分布 ,这种分布与区域应力场的分布特征基本吻合 .该区发生的 4次 6级以上地震前 3个台小震综合机制解的P轴方位显示出较好的一致性 ,特别在伽师地震前P轴方位集中分布于N60°～ 74°E ,与伽师强震群震源机制解的P轴方位基本相同
The synthetic focal mechanism solutions of small earthquakes recorded by Wuqia,Kashi and Bachu stations in Xinjiang are used to study background of stress field before mid strong earthquakes in northeastern Pamir. The results show that the P axis directions of the solutions from the three stations have a dominant distribution respectively, which are indentical with the regional stress field.The directions show a better conformability before four M S≥6.0 earthquakes.Especially ,before the Jiashi strong swarm, the direction of the P axes are concentrately distributed from 60° to 70° which are indentical with P axis direction of focal mechanism solution of the swarm.
The synthetic focal mechanism solutions of small earthquakes recorded by Wuqia,Kashi and Bachu stations in Xinjiang are used to study background of stress field before mid strong earthquakes in northeastern Pamir. The results show that the P axis directions of the solutions from the three stations have a dominant distribution respectively, which are indentical with the regional stress field.The directions show a better conformability before four M S≥6.0 earthquakes.Especially ,before the Jiashi strong swarm, the direction of the P axes are concentrately distributed from 60° to 70° which are indentical with P axis direction of focal mechanism solution of the swarm.
引文
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[2] 高国英,温和平.帕米尔东北侧现代构造应力场与地震活动特征[J].中国地震,2000,16(2):176—183.
[3] 胥颐.天山地震构造带的地壳结构与强震构造环境[J].地球物理学报,2000,43(2),184—193.
[4] 华祥文.应力变化与强震潜在震源[M].北京:科学技术出版社,1988.32—42.
[5] 刁桂苓,于新易.唐山地震前后津、京、张地区综合断层面解[J].西北地震学报,1980,2(1):30—47.
[6] 成尔林,李桂芳,陈和川.1996年四川省松潘平武7.2级地震前后主压应力轴的方向特征[J]地震学报,1982,4(2):136—148.
[7] 成尔林,庞明虎.1976年盐源宁蒗6.7级地震前后平均应力轴取向的时间特征[J].地震,1985,(6):20—27.
[8] 孙家林,武慧聪,阎海滨.关于强震前中小地震平均主应力方向和初动符号矛盾比变化问题的研究[A].见:国家地震局科技监测司,地震预报方法实用化研究文集———地震专集[C].北京:学术期刊出版社,1989.460—473
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