摘要
1988年11月6日发生在云南省澜沧—耿马地区的两次强烈地震,其构造分型属雁列地震。7.6级地震的地表形变带呈“入”字形展布;7.2级地震的地表形变带反映单一发震构造特征。根据大地水平形变资料,主压应变轴为北东方向,地表形变带上存在明显的水平剪切错动;根据大地垂直形变资料,地表形变带无垂直向弹性差异形变,仅表现出一种重力堑的作用。本次地震序列所反映出来的大地形变基本特征与中国历次大陆地震相同。
The two strong earthquakes, which occurred in the Lancang--Gengma area of Yunnan Province on November 6, 1988, are classified by tectonic characteristics as an echelon earthquakes. The distribution of ground deformation zones caused by the M7. 6 earthquake takes the shape of '入' letter, and that by the M7. 2 earthquake reflects monotonic earthquake--generating tectonic characteristics. According to the geodesic horizontal deformation data, the analytic results show that the principal compressive strain axis exhibits NE direction and that there exist obvious horizontal shear dislocations on the ground deformation zones. Based on the geoobesic vertical--component deformation data, the given conclusions reveal that there is no vertical--component elastic differential deformation on the ground deformation zones,and only gravity grabens appear. The basic features of geodesic deformation shown by. the earthquake sequence are the same as those of all the previous continental earthquake occurred in China.
出处
《地壳形变与地震》
CSCD
1993年第1期69-76,共8页
Crustal Deformation and Earthquake
关键词
澜沧-耿马
地震
大地变形
震级
Lancang—Gengma earthquake
horizontal defermation
vertical deformation
deformational feature
