我国大陆,特别是西部及其邻区,地震活动频繁,历史上发生过多次8级以上的大地震(图1)。大地震活动区如同一个三角形楔子延伸到大陆内部如此之远,强度如此之大,是世界上独有的。造成这个奇特现象的原因,主要是由于印度洋板块与欧亚板块相顶撞而成的。並且这种顶撞至今还影响着我国大陆,尤其是对我国西部地震活动的影响起着最为重要的作用。 There are frequent earthquakes in China, especially in the west and adjacent areas. There have been many earthquakes of magnitude 8 or higher in history (Figure 1). Earthquake activity area as a triangular wedge extends to the mainland so far, the intensity is so large, is unique in the world. The reason for this peculiar phenomenon is mainly due to the collision of the Indian Ocean plate with the Eurasian plate. And this kind of collision still plays an important role in affecting the Chinese mainland, especially the impact on the earthquake in western China.