晋冀鲁豫相邻地区中小地震震源机制特征分析

英文篇名：Focal Mechanism Characteristics of Small and Medium Earthquakes in Border Area of Shanxi,Hebei,Shandong and Henan
中文刊名：山西地震
英文刊名：Earthquake Research in Shanxi
作者：闫俊岗 ; 王利兵 ; 孙晴
英文作者：YAN Jun-gang1 ; 3 ; WANG Li-bing2 ; 3 ; SONG Qing1 ; 3(1.Handan Central Seismological Station of Earthquake Administration of Hebei Province ; Handan ; Hebei 056001 ; China ; 2.Hongshan Reference Seismological Station of Hebei Province ; Xingtai ; Hebei 054001 ; China ; 3.College of Geoexploration Science and Technology of Jilin University ; Changchun ; Jilin 130026 ; China)
中文关键词：震源机制解 ; 应力场 ; 聚类分析
英文关键词：Focal mechanism solution ; Stress field ; Cluster analysis
出版日期：2008-10-15
机构：河北省地震局邯郸地震中心台;吉林大学地球探测科学与技术学院;河北红山基准地震台;
年：2008
期：04
出版单位：山西地震

摘要

采用从震源向上射出的直达P波和直达S波引起的地动位移振幅比,结合P波初动方向来求解震源机制的方法,得到晋冀鲁豫相邻地区102个地震的震源机制解。并进行系统聚类分析,发现中小地震显示散乱,表明强震是大范围应力积累释放的表现形式;小地震具有随机性,受局部因素影响较大,对华北构造应力场的控制作用较弱。
Based on the amplitude ratios of ground displacement of P-wave and S-wave radiating upwards from focal,combining directions of P-wave first motion,focal mechanism solutions of 102 earthquakes in border area of Shanxi,Hebei,Shandong and Henan are obtained.It shows that focal mechanism solutions of these small and medium earthquakes are scattered in systematic cluster analysis.It indicates that strong earthquakes are release of stress accumulated in a large region while as small earthquakes are in random,affected greatly by local factors and have weaker control on tectonic stress field of North China.

引文

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