STUDY ON RECENT TECTONIC STRESS FIELD IN YUNNAN REGION

doi:10.3969/j.issn.0253-4967.2011.01.009

Abstract

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 modern tectonic stress field in Yunnan region.The results show that most moderate-strong earthquakes occurring in 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 are almost equivalent in proportion,about 8%each,respectively.The tectonic stress field of Yunnan region is near-horizontal,and the dips of earthquake fault planes are large.There are three main dynamic sources acting in Yunnan region: one is the NE,NNE and NNW directed acting force from Burma,Laos and Vietnam; the second is the SE-SSE directed force from Sichuan and Sichuan-Yunnan rhombus block; and the third is the NW-NNW directed force from South China block.These three acting forces have controlled the faulting behavior of the main faults and the characteristics of activity of strong earthquakes in Yunnan and its adjacent regions.

Key words: focal mechanism solution, earthquake classification, tectonic stress field, Yunnan region

摘要：

利用云南及周边地区中强地震震源机制解资料,采用对震源机制参数进行统计的方法,详细分析了地震断层类型和云南地区的现代构造应力场特征。结果表明,云南地区发生的中强地震走滑型地震占绝大多数,比例为80%,正断型和正走滑型与逆断型和逆走滑型地震所占的比例相当,分别约为8%。云南地区应力场接近水平,地震错动面的倾角较陡。云南地区有3个方面的主要力源: 一是来自缅甸、老挝和越南的NE、NNE和NNW向作用力; 二是来自四川及川滇菱块的SE、SSE向作用力; 三是来自华南地块的NW、NNW向作用力。这3方面的作用力控制了云南及其邻区的主要断层活动及强震活动。

关键词: 震源机制解, 地震类型, 构造应力场, 云南地区

CLC Number:

P315.3⁺3

QIAN Xiao-dong, QIN Jia-zheng, LIU Li-fang. STUDY ON RECENT TECTONIC STRESS FIELD IN YUNNAN REGION[J]. SEISMOLOGY AND GEOLOGY, 2011, 33(1): 91-106.

钱晓东, 秦嘉政, 刘丽芳. 云南地区现代构造应力场研究[J]. 地震地质, 2011, 33(1): 91-106.

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