摘要
本文以159个震源机制解为主,并结合其他途径所得结果,对华南地区震源应力场作进一步综合分析,推断本区现代地壳构造应力场方向特征,并对分区差异、震源破裂机制和力源等作了较全面的探讨。
By means of the 159 focal mechanism solution mainly and with other results obtained by other means, the stress field of modern crustal construction in South china area is comprehensively analyzed. It is indicated that the direction of the main compressional stress in this area is in NWW-NW from east to west, but there are the regional difference, of which the force sources chiefly come from the action of the Philippine Sea plate. The axis of P and T are proximately horizontal, of which the feature that the elevation angles less than 30° have got 55% to 88%. And the seismic dislocational planes are proximately vertical, of which the angles larger than 60° have got over 70%. It is points out that the crust in this area is acted by horizontal forces so that the dislocations of the strke slip faults with high angle are the more important. The fault systems which would be effected easily to dislocate are in the direction of NEE and NW. The characters of dislocation from each side of east and west are in difference. Among the seismic focal fracture types, the ratio of twist type is in dominant and the tension-twist type is in subsequence.
出处
《华南地震》
1992年第2期23-31,共9页
South China Journal of Seismology
关键词
华南地区
震源机制
破裂类型
South China Area
Focus mechanism
Main stress direction
seismic fracture type
