华北强震断层面解和震源深度特征

THE CHARACTERISTICS OF FAULT PLANE SOLUTIONS AND FOCAL DEPTHS OF STRONG EARTHQUAKES IN NORTH CHINA

本文利用远震P波及SH波和区域地震P_(nl)波波形反演方法,测定了华北9次强震的断层面解、震源深度及地震矩.结合其他作者测定的7次地震的结果,分析了华北16次强震断层面解及华北地震震源深度特征.结果表明,华北多数强震为走滑型地震,也有个别正断层型及逆断层型地震;16次地震多数发生在地壳中部10—25km深度范围内.

The source parameters of 9 strong events in the North China region have been determined with a joint moment tensor inversion of teleseismic and regional distance body waves (P, SH, Pnl). Combined with the results of 7 events, which were obtained by other authors, the characteristics of fault plane solutions and focal depths of 16 strong earthquakes in North China have been analysed. The results are as follows: Most focal mechanisms for these events are predominant strike slip movement, both normal and reverse faulting occurred as well. The-focal depths for 16 events are in the midcrust about 10-25 km.