摘要
本文分析了2013年4月20日Ms7.0芦山主震和余震的强震动记录,与美国NGA-West2数据以及地震动衰减关系对比,分析了地震动区域特征。研究结果表明,与美国加州地区中小震的强震动数据相比,芦山余震强震动记录的高频幅值较大,地震动影响有效范围较小;在地震动传播路径上芦山地区相比美国加州地区具有较慢的非弹性衰减特性(较高的Q值)。建议对我国地震动衰减关系构建时通常采用的映射法的合理性进行重新考虑。
Earthquake strong motions are dependent on region factors. We processed the strong motion data from Lushan earthquake sequences and compared with the database of NGA-West2. Compared with strong motion data of small-to-moderate earthquakes in Californian,Strong motion data from Lushan Earthquake has been proven that the amplitude in high frequency is higher and the effective distance is smaller. It also shows that ground motions from Lushan Earthquake have slower anelastic attenuation than those in California. It is suggested that the transform method in building Chinese ground motion attenuation relationship should be evaluated the regional dependence between two studies regions.
出处
《地震工程与工程振动》
CSCD
北大核心
2014年第S1期188-192,共5页
Earthquake Engineering and Engineering Dynamics
基金
中国地震局工程力学研究所基本科研业务费专项(2013C03)
国家自然科学基金项目(51308515
51178152)
公益性行业科研专项(201208014)资助
关键词
芦山地震
地震动
有效范围
非弹性衰减
Lushan earthquake
ground motion
effective distance
anelastic attenuation
