【摘要】 2008年汶川8.0级特大地震发生后,又发生了多次余震,震区的固定台站和流动台站因此获取了上万条MS3.3～6.4级地震动观测记录。地震记录显示这些余震的震中距和震级分布比较均匀,为建立地震动衰减关系奠定了较好的数据基础。本文基于汶川地震MS3.3～6.4震级范围内、震中距小于150 km区域范围的余震观测数据进行了统计回归分析,建立了汶川地震余震(MS≤6.4)的衰减关系模型,并对地震动加速度峰值(PGA)给出了具体的衰减关系表达式。更多还原

【Abstract】 With the Wenchuan 8.0 earthquake in 2008,a number of aftershocks occurred,therefore regular-stations and moving-stations in the earthquake zone obtained thousands of the MS3.3 ～ 6.4 motion records.Point of view from the epicentral distance and magnitude,these Wenchuan Earthquake aftershocks’ data distributed evenly,laying a good data base for the establishment of ground motion attenuation relationship.Based on Wenchuan earthquake aftershocks’ data magnitude between 3.3 and 6.4 within the epicentral distance less than 150km area,established the attenuation relationship model of Wenchuan Earthquake aftershocks(MS≤6.4) by statistical regression analysis,and provided the specific attenuation relationship expressions in terms of the peak ground accelerations(PGA).更多还原