摘要
银川盆地的破坏性地震活动具有频度高、强度大和灾害重的特点。破坏性地震主要集中在两个区域,第一个区域为有史以来以强震为主的宁夏永宁县至银川市,其中1739年银川8级地震造成巨大人员伤亡和财产损失。另一个区域为建国以来以中等地震为主的宁夏吴忠灵武地区。另外银川盆地以沉积地层为主,对地震波有吸收或放大效应可能是震感强烈的主要原因。
The destructive seismic activities in Yinchuan basin are characterized by high frequency,high in-tensity and heavy disaster.Destructive earthquakes are mainly concentrated in two areas.The first area is the Ningxia Yongning County to Yinchuan city,which is dominated by strong earth-quakes in history.In 1739,the Yinchuan earthquake of magnitude 8 caused huge casualties and property losses.The other area is Wuzhong Lingwu area in Ningxia,which is mainly composed of moderate earthquakes since the founding of the People’s Republic of China.In addition,Yinchuan basin is dominated by sedimentary strata,and the absorption or amplification effect of seismic waves may be the main reason for the strong seismic sensation.
基金
宁夏回族自治区科技厅自然科学基金项目(NZ17222)。
