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第 24 卷第 3 期地震工程与工程振动 Vol. 24 ,No. 3
2004 年 6 月 EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION Jun. 2004
文章编号:1000 1301 (2004) 03 0030 08
近断层地震动加速度峰值衰减规律的研究
邵广彪, 冯启民
(中国海洋大学工程学院,山东青岛 266071)
摘要:提出了近断层地面运动的衰减模型,对全球范围内 6. 0 ≤MW ≤7. 6 且震源深度均小于 20km 的
636 条地震动加速度峰值进行了统计分析,确定了本文研究的近断层区域为断层距 25km ,利用此范围
内的 440 条记录进行了近断层加速度衰减规律的研究。水平地震记录分为硬土和软土两种场地类
型,竖向地震记录只考虑土层场地,利用最小二乘法进行数据拟合分析,得到 PGA 随断层距和震源深
度变化在不同震级处形成的衰减曲面,分析了近断层处水平、竖向的 PGA 以及竖向与水平 PGA 之比
( V/ H) 的衰减规律。
关键词:近断层;地面运动;加速度峰值;衰减规律
中图分类号:P315、915 文献标识码:A
Research on attenuation of near fault peak strong ground motion acceleration
Shao Guangbiao , Feng Qimin
( Engineering College , Ocean University of China , Qingdao 266071 , China)
Abstract :A new near fault attenuation model is proposed. A worldwide database consisting of 636 strong motion records
from earthquakes with Mw = 6. 0~7. 6 and depth ≤20km is formed. After mean statistics of these records , we think that
the characteristics of near fault ground motion are notable when the distance to fault is less than 25km. Using these 440
records (fault distance not larger than 25km) from 22 earthquakes , near fault attenuation characteristics of horizontal and
vertical peak ground acceleration are studied. Horizontal data are grouped into stiff soil and soft soil site and vertical data
are only regarded to soil sit