当分析我国大陆地区的地震活动性时,人们注意到一个突出的现象,就是处于我国大陆内部的鄂尔多斯地块,其内部没有什么地震活动,但周围的地震却非常活跃.我国大陆地区有史以来共记载8级以上的特大地震15次,发生在鄂尔多斯地块边缘的就有5次之多,占了三分之一.我国历史上灾害最惨重、死亡83万人的陕西华县地震,最强烈的宁夏海原8(1/2)级地震,都是发生在该地块的边缘. When analyzing the seismicity in China’s mainland, one notable phenomenon that people noticed was the Ordos massif within China’s interior, with no seismic activity inside, but the surrounding earthquakes were very active. It recorded 15 extraordinary earthquakes of magnitude 8 or above and occurred on the margin of the Ordos for five times, accounting for one third of the total. The most devastating earthquake in China’s history was the Hua County, Shaanxi Province, where 830,000 people died. The Ningxia Haiyuan 8 (1/2) magnitude earthquake occurred at the edge of the block.