【摘要】 利用从震源向上射出的直达P、S波引起的地动位移振幅比求解震源机制,得到赣南及近邻地区58个ML2.0~4.2地震的震源机制解。对震源机制解P、T轴参数进行l0°间隔归一频数分析,得到如下结论:①本区地震断层以走滑型为主;②震源机制P轴方位主要分布在270°～330°间,平均方位为287°,P轴倾俯角以小于30°的近水平优势分布,这一结果与区域NWW-SEE水平挤压为特征的构造应力场相吻合。更多还原

【Abstract】 Based on the amplitude ratios of ground displacement caused by upward direct wave P and S from focal,focal mechanism solutions of 58 ML2.0～4.0 earthquakes in the Southern Area of Jiangxi province and its adjacent areas are calculated.On the basis of analysis by 10° interval normalizational frequence on the parameters of P-axis and T-axis of these focal mechanism solutions,we draw two conclusions: 1) the earthquake faults in this area are mainly strike-slip faults;2) the P-axis orientation are mainly distributed from 270° to 330°,its averaged orientation is 287°,and the P-axis elevation angles are nearly horizontal distribution.The results are consistent with the regional NWW-SEE horizontal compressional tectonic stress field.更多还原