摘要
地震迁移有两种类型,一种是沿构造带迁移,另一种是短时间、长距离、直线式的震中迁移,其迁移路线能跨越不同的构造单元。这后一种迁移类型,其迁移方向与构造压力方向呈45°夹角。按照立交模式的观点,它反映了下岩石圈中剪切蠕滑断层的运动。本文利用上述观点和地震迁移资料对与中国大陆相邻板块运动方向进行了确定,得到太平洋板块、印度板块和欧亚板块分别向西、向北和向南南西方向运动。研究结果还表明,我国最近一次大震高潮期和低潮期板块运动方向是稳定的。此外,本文还讨论了由地球自转引起的纬向和经向地震迁移。
There are two types of seismic migrations, one of which migrates along the tectonic zones and another is short-term, long-distance and linear epicentral migration, the latter can cross various tectonic units, The angle between the migration direction and the tectonic compressional direction for second type is 45°. According to the stereographic cross model, the second type of migration reflects the shear-creep fault movement beneath the lithosphere. This paper determined the plate movement direction adjacent to China Mainland based on the above-mentioned viewpoint, the movement directions of the pacific, Indian and Eurasian plates obtained are westward, northward and SSW, respectively. The results also show that the plate movement directions are steady in the recent active and quiet pe iods (1966-1985) of great earthquakes. Additionally, the latitudinal and longitudinal seismic migrations caused by the earth rotation were also discussed in this paper.
出处
《地震》
CSCD
北大核心
1992年第4期1-6,共6页
Earthquake
