• 责任者：Lin Xiangdong (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Xu Ping
• 刊名：Acta Seismologica Sinica
• 出版年：2011
• 卷期：33(6)
• 关键词：震源机制 ; focal mechanism ; 应力场 ; stress fields ; 云南 ; Yunnan Province
• 页码：p.755-762
• 图表：2 illus., 5 tables, 23 refs.
• 分类号：0500
• 出版序号：20122249
• issnNo：ISSN0253-3782
• isbnNo：CN11-2021/P

Based on 740 focal mechanism solutions of M_L≥2.5 earthquakes occurred during Jan. 1998 to Jan. 2009 in middle Xiaojiang fault and its adjacent area, the studied region was divided into sub-regions, and temporally further divided into phases with the larger earthquakes as boundary of the sub-regions. After removal of the larger earthquakes this paper inverted the focal mechanism data with the method of Gephart for the stress in main phase of each sub-region. The result indicates that the azimuth of maximum principal stress σ₁ in 4 temporal phases of the sub-region A is approximately NNW-SSE, and in northern part of sub-region B are approximately NNW-SSE, WNW-ESE and ENE-WSW. The azimuth of σ₁ in southern part of sub-region B is approximately NNW-SSE.