文章摘要

文章信息/Info

Title:: Study on the Attenuation Relationship of Strong Ground Motion in Jiangsu and its Adjacent Area

Author(s):: ZHAN Xiaoyan; ZHU Shengchu; WANG Hengzhi; Earthquake Administration of Jiangsu Province,Nanjing 210014,Jiangsu,China

Keywords:: peak acceleration; ground motion attenuation relation; distribution of seismic intensity; Jiangsu and its adjacent area

摘要:: 基于2006—2015年江苏省强震动台网记录到的大量强震动数据,根据近场距离饱和的加速度经验衰减模型,利用多随机变量回归分析方法、最小二乘法拟合确定出经验衰减关系模型中的各个系数,获取了江苏及邻区中小地震的地震动参数衰减关系。以2012年7月20日江苏高邮M4.9地震为例,结合新求取的地震动衰减关系计算其震源区的地震动加速度场,结果显示:相比于直接采用内插值方法的分布结果,采用衰减关系校正后的结果所显示的地震动加速度场的连续性分布特征更为明显,加速度场长轴走向更接近于实际调查得到的地震烈度分布。

Abstract:: Based on a large number of strong motion data recorded by Jiangsu Province strong motion network since 2006 and the near field distance saturated empirical acceleration attenuation model,we use multiple random variables regression analysis method and least squares fitting to determine the empirical attenuation relation model of each coefficient,and thus the attenuation relationship of ground motion parameters of small and medium earthquakes in Jiangsu and its adjacent areas is obtained.Take the July 20,2012 Jiangsu Gaoyou M4.9 earthquake as an example,we calculated its ground acceleration field in the focal region combined with the new the attenuation relation.The results show that compared to use the results of direct interpolation method,the attenuation relationship between the corrected results the vibration acceleration field of continuous distribution features are more obvious,and more close to the actual investigation to the seismic intensity distribution.