2001年我国大陆中强地震活动的构造背景

TECTONIC BACKGROUND OF MIDDLE-STRONG EARTHQUAKES IN CHINA MAINLAND IN 2001

归纳总结了 2 0 0 1年我国西部 5级、东部 4级以上地震的发震构造背景 ,研究表明 :2 0 0 1年中国大陆 5级以上的地震大部分发生在青藏一级地块内 ,华北地块仅发生几次 4级地震 ,其它地块内的地震也较少。发震断层均为各活动地块内的主要活动断层。其中 1998～ 2 0 0 1年 。

The 8.1 earthquake occurred in west pass of Kunlun Mountains in Qinghai-Tibet plateau inner on Nov.14,2001 is the largest earthquake in China mainland since 50 years.The most of earthquakes more than Ms5.0 in China mainland occurred in the first grade block-Qinghai-Tibet Block,only several Ms4.0 earthquakes occurred in North China Block,and there were less earthquakes in the other blocks in China mainland.The most of earthquakes occurred at main active faults in each active block.From 1998 to 2001,the active strength of mid-strong earthquakes is that later half a year was obviously more than beginning half a year in China mainland.