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Title:: Study on the Ground-motion Attenuation Relation in the Loess Region of China

作者:: 李平¹; 2; 鞠雅倩¹; 2; 徐建元¹; 2; 欧阳刚垒¹; (1.防灾科技学院,河北三河 065201; 2.河北省地震灾害防御与风险评价重点实验室,河北三河 065201)

Author(s):: LI Ping¹; 2; JU Yaqian¹; 2; XU Jianyuan¹; 2; OUYANG Ganglei¹; (1.Institute of Disaster Prevention,Sanhe 065201,Hebei,China)(2.Key Laboratory of Earthquake Disaster Prevention and Risk Assessment of Hebei Province,Sanhe 065201,Hebei,China)

Keywords:: the Loess region; ground motion; PGA; the Two-step Regression method; attenuation relations

摘要:: 收集、筛选并整理了2001—2019年我国黄土地区发生的141次M_S2.4～6.7地震的1 092条台站记录,选取台站中两水平向峰值加速度偏高的值作为拟合值,采用两步回归法拟合得到了我国黄土地区水平向土层地震动衰减关系,分析了地震动残差随震级和距离的分布趋势,并将衰减关系和已有研究成果进行了对比。结果表明:绝大多数实测值均在拟合峰值加速度衰减曲线±1倍标准差范围以内,模型能较好地反映中国黄土地区峰值加速度随距离衰减的趋势。

Abstract:: In this paper,1 092 pieces of records of 141 seismic events occurring in the Loess region of China from 2001 to 2019 were sorted out.The higher values of the two horizontal peak accelerations are selected as the fitting values,and the Two-step Regression method is used to obtain the horizontal ground-motion attenuation relation in the Loess region of China.The distribution of residuals related with magnitude and distance is analyzed,and the attenuation relation proposed in this paper is compared with the ones proposed by other researchers.The results show that most of the observed values are within the range of ±1 standard deviation of the acceleration attenuation curve,and the model proposed in this paper can better reflect the peak acceleration's attenuation trend with distance in the Loess region of China.