【摘要】 利用1978～2009年川滇地区的124个地震震源机制解资料,采用对震源机制参数统计的方法,详细分析了地震断层类型和川滇地区的现代构造应力场特征。结果表明,云南地区(21°～28°N,97°～108.8°E)主要受近N-S向的水平挤压力影响,区域应力场背景以水平作用力为主;四川地区(28°～34.5°N,97°～108.8°E)由于平均P,T轴的仰角接近水平,构造应力场接近水平,主要受近E-W向挤压力作用,断层面较陡,受水平剪切力作用。川滇地区走滑型地震较多,主要分布于云南地区,四川地区内发生的地震类型较为分散且每种类型都有。更多还原

【Abstract】 Basing on 124 focal mechanisms data from 1978 to 2009 in Sichuan-Yunan area,we analyzed the fault type of earthquake and the characteristic of modern tectonic stress field in Yunnan-Sichuan area by the statistic method of focal mechanisms parameters. The results show ed that it was influenced by horizontal compression in nearly NS direction in Yunnan area ( 21° ～ 28°N,97° ～ 108. 8°E) ,and the main characteristic of regional stress field background is characterized by horizontal compression. Because of the average plunges of P-axis and T-axis were close to horizontal,the tectonic stress field which is close to horizontal mainly influenced by compression in nearly EW direction in Sichuan area ( 28° ～ 34. 5°N,97° ～ 108. 8°E) . The fault plane which was influenced by horizontal shear tress is stepper. The main type of fault is strike-slipe in Sichuan-Yunnan area,and mainly dis- tributed in Yunnan. The earthquake occurred in Sichuan area had many types and scattering distribution.更多还原