Abstract:

Through statistic analysis of a lot of archaeological data,the differential subsidence rate areasin the Weihe fault basin have been divided based on the average buried rates of the top surface ofcautural layers. Furthermore,the relationship between the rate of modern crustal vertical differential movement(3000 to 5000 B.P)and seismic activity has been studied quantitatively by theburied depth,thickness and distance form the present surface of the cultural layers. Finally,anestimation of seismic risk for coming tens of years for the Weihe fault basin has been done. It issuggested that there exists a possibility of earthquake with magnitude of 5 occurring in the coming 20 to 30 years in this region only.

Key words: Archeologacal data, Weihe fault basin, Modern crustal movement, Vertical differential movement rate, Seismic activity

摘要：

通过对大量考古数据的统计分析,用文化层顶面的平均埋深速率对渭河断陷进行了下沉速率分区,进而用文化层的埋深、厚度及其距现代地面的高度,定量地研究了渭河断陷现代(距今3000～5000a)地壳垂直差异运动速率与地震活动的关系。最后,对渭河断陷未来几十年内的地震危险性作了估计,认为该区在今后20～30a仅有发生5级左右地震的可能性。

关键词: 考古数据, 渭河断陷, 现代地壳运动, 垂直差异速率, 地震活动