【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。更多还原

【Abstract】 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.更多还原