【摘要】 研究近断层区域地震动的峰值衰减规律,可以为近断层区的地震危险性分析和工程结构抗震设计提供关键性基础数据.基于包括中国"5.12"汶川地震在内的全球23次地震事件中的338条近断层地震动记录,引入考虑震级和断层距影响的地震动衰减模型,采用最小二乘法对峰值加速度、峰值速度及峰值位移进行了回归分析,得到了近断层区域地震动峰值的衰减关系.与其他学者所提出的衰减关系的对比表明,文中提出的峰值衰减模型可更准确地揭示近断层区域地震动峰值的衰减变化规律.更多还原

【Abstract】 The peak value attenuation relationship of earthquake ground motions in near-fault regions should be investigated to provide the key basic data for seismic hazard analyses and engineering structure seismic design in the vicinity of active fault district.Based on the collection of 338 near-fault records from 23 worldwide earthquake events including the "5.12" Wenchuan Earthquake,an attenuation model which considered the influence of magnitude and distance to fault rupture was proposed,and the parameter regression analysis for PGA、PGV and PGD was calculated by least square method.The peak attenuation relationship of near-fault earthquake ground motion was obtained.The comparison with other attenuation relationships shows that the advised peak attenuation relationship can correctly reveal the peak attenuation in near-fault regions.更多还原