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本文在概述云南地壳构造特点和地震活动特征的基础上,以七级和七级以上地震为例,重点分析了云南主要构造体系与强震分布的相关特点,利用多年来地震地质、地球物理及地震活动性成果,简述了云南及邻区的现代构造形变特征。结合地震破裂带、地壳形变、绝对应力测量、震源机制以及模拟实验等动态观测资料,得到云南现今构造应力场总的以北北西向主压应力为主导。最后,以上述资料为依据,对云南地区未来强震发生的可能地段作了趋势估计。
Based on the characteristics of crustal structure and earthquake activity in Yunnan Province, taking the earthquakes of magnitude 7 and above as an example, this paper analyzes the related features of the main tectonic systems and the distribution of strong earthquakes in Yunnan Province. Taking advantage of the seismic geology, geophysics and Seismic activity of the results, briefly described the characteristics of modern tectonic deformation in Yunnan and its neighboring areas. Based on the dynamic observation data of earthquake rupture zone, crustal deformation, absolute stress measurement, focal mechanism and simulation experiment, the tectonic stress field in Yunnan is dominated by the north-west-directed compressive principal stress. Finally, based on the above data, a trend estimation is made of the possible locations of the future strong earthquakes in Yunnan.