欧洲中小震基岩水平向地震动衰减关系研究

摘要

大震与中小震之间的地震动衰减规律有所不同.本文使用了132条欧洲基岩水平向记录研究中小震地震动衰减规律.震级范围在地方震级4～6级,距离在震源距70km以内.本文得到了峰值加速度和5%阻尼比、周期0.04～4.00秒之间的加速度反应谱的衰减关系.通过与欧洲和美国西部地震动衰减关系对比,分析了在地震活动性不同的地区内,大震与中小震之间存在的差异有何不同.%There are very significant differences between strong and small-moderate earthquakes, for example, the ground motion of small-moderate earthquakes attenuate more fast, transmit a smaller distance and have more high frequency components. We use 132 small-moderate horizontal recordings on rock in Europe to study the attenuation relationship. Local magnitudes are between 4 and 6, hypocenter distances are less than 70km. We obtain the attenuation equations for PGA and 5% damp SA at spectra periods between 0.04 and 4 seconds. We make comparisons between the attenuation relations of Europe and America, and then analyze the discrepancies between the strong and small-moderate earthquakes in different seismicity areas.