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1976年5月29日在云南省龙陵地区相继发生了7.3级和7.4级双震型强烈地震,震后不久采用形变手段在震区内施测了12条微波测距边。为研究地形变衰减趋势,震后两年又将原施测的12条边扩展到31条。 本文根据上述资料对该地区的地壳水平形变量进行了计算、分析,对不同的数据处理方法作了讨论、评议。计算结果得到区域二维应力场为北东—南西向压缩和北西—南东向引张。
On May 29, 1976, a series of strong earthquakes of magnitude 7.3 and 7.4 double earthquakes occurred successively in Longling, Yunnan Province. Shortly after the earthquake, 12 microwave ranging edges were measured in the earthquake zone by means of deformation. In order to study the declining trend of the terrain, the 12 edges of the original survey were extended to 31 again two years after the earthquake. Based on the above data, this paper calculates and analyzes the horizontal deformation of the crust in the area, and discusses and comments on different data processing methods. The results show that the two-dimensional stress field in the region is north-east-south-west compression and north-west-south eastward.