Research on Structural Stress Field Basing on Focal Mechanism Solutions Data in Sichuan-Yunan Area
详细信息
- 责任者：Cao Ying (Earthquake Administration of Yunnan Province ; Kunming 650224 ; China) ; Wu Xiaoping
- 刊名：Journal of Seismological Research
- 出版年：2013
- 卷期：36(2)
- 关键词：震源机制 ; focal mechanism ; 构造应力场 ; tectonic stress field ; 四川 ; Sichuan Province ; 云南 ; Yunnan Province
- 页码：p.165-172
- 图表：illus., 2 tables, 16 refs.
- 分类号：0500
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
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.
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