中国地震研究：英文版2011，Vol.25Issue(4)：409-425,17.
Study on the Recent Tectonic Stress Field in the Yunnan Region
Study on the Recent Tectonic Stress Field in the Yunnan Region
摘要
Abstract
In this paper, using focal mechanism solutions of moderate-strong earthquakes in Yunnan and its adjacent areas, and based on the statistical analysis of the parameters of focal mechanism solutions, we discussed in detail the earthquake fault types and the characteristics of the modern tectonic stress field in the Yunnan region. The results show that most moderate-strong earthquakes occurring in the Yunnan region are of the strike- slip type, amounting to 80% of the total. Normal faulting and normal with strike-slip and reverse and reverse with strike-slip earthquakes is almost equivalent in proportion, about 8 % each. The tectonic stress field of the Yunnan region is near-horizontal, and the dips of earthquake fault planes are large. There are three main dynamic sources acting on the Yunnan region： one is the NE, NNE and NNW-directed acting force from Myanmar, Laos and Vietnam; the second is the SE-SSE directed force from the Sichuan and Sichuan-Yunnan rhombus block and the third is the NW-NNW directed force from the South China block. These three acting forces have controlled the faulting behavior of the main faults and the characteristics of strong earthquake activity of Yunnan and its adjacent regions.关键词
现代构造应力场/云南地区/震源机制解/地震断层/川滇菱形块体/中强地震/邻近地区/统计分析Key words
Focal mechanism solution/Earthquake classification/Tectonic stress field/The Yunnan region分类
天文与地球科学引用本文复制引用
Qian Xiaodong,Qin Jiazheng,Liu Lifang..Study on the Recent Tectonic Stress Field in the Yunnan Region[J].中国地震研究：英文版,2011,25(4):409-425,17.基金项目
The project was sponsored by the important projects of Yunnan Province, entitled "The regularity of strong earthquake activities and the plate margin dynamic mechanism on the eastern margin of the Qinghai-Tibet plateau"(2010CC006) and "Study on relationship between evolutionary dynamics of geophysical and geochemistry field and strong seismic activity in Yunnan" ( JCYB200806015 ). （2010CC006）
