张斌^1,2,,
俞言祥^2,,,
李小军¹,
王玉石¹,
荣棉水¹
1. 北京工业大学城市建设学部, 北京 100124
2. 中国地震局地球物理研究所, 北京 100081

基金项目: 国家重点研发计划课题（2019YFC1511004）和国家重点研发计划政府间合作项目（2018YFE0109800）联合资助


详细信息

作者简介: 张斌, 男, 1989年生, 助理研究员, 主要从事地震动衰减关系等方面研究.E-mail: vincent_zhang0322@163.com

通讯作者: 俞言祥, 男, 1964年生, 研究员, 主要从事地震动衰减关系和地震动模拟等方面研究.E-mail: yuyx@cea-igp.ac.cn

中图分类号: P315

收稿日期:2020-11-17
修回日期:2021-05-26
上线日期:2021-08-10

Ground motion attenuation relationship of horizontal component of PGV and PGD in southwest China

ZHANG Bin^1,2,,
YU YanXiang^2,,,
LI XiaoJun¹,
WANG YuShi¹,
RONG MianShui¹
1. Faculty of Urban Construction, Beijing University of Technology, Beijing 100124, China
2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China


More Information

Corresponding author: YU YanXiang,E-mail:yuyx@cea-igp.ac.cn

MSC: P315

--> Received Date: 17 November 2020
Revised Date: 26 May 2021
Available Online: 10 August 2021


摘要
摘要:本文收集西南地区79个4.0 < M_S≤8.0主震、0 < R_rup < 300 km的自由场地加速度记录，采用合理可靠的数据处理方法获得峰值速度（PGV）和峰值位移（PGD）的水平分量几何均值各1600个.建立包含西南地区强震动数据及相应的震源、距离、场地参数等各项元数据的数据集.统计回归得到西南地区包含震级饱和效应、震级相关几何衰减、线性和非线性场地响应、非弹性衰减的水平向PGV、PGD衰减关系.进行了事件间和事件内残差评估、模型评估.将本文衰减曲线与西南地区大震和强震的实际观测值、川藏区水平向PGV衰减关系以及NGA-West1的水平向PGD衰减关系进行对比.结果表明，本文衰减关系用于估计西南地区震级M_S4.0-8.0、距离10~300 km的地震动PGV、PGD是有效的.绝大多数汶川、芦山、鲁甸和九寨沟地震的PGV、PGD观测值分布在本文PGV、PGD衰减曲线±1倍标准差以内.本文的PGV、PGD衰减曲线显示了震级相关的PGV、PGD衰减和土层非线性的平均效应.与国内常用衰减关系和NGA-West1衰减关系相比，本文衰减关系能更好地体现震源特性、传播介质、场地非线性对西南地区水平向PGV、PGD衰减特征的影响.
关键词: 西南地区/
峰值速度/
峰值位移/
衰减关系/
非线性场地响应

Abstract:We collect accelerograms recorded on free-field of 79 mainshocks with 4.0 < M_S≤8.0 and 0 < R_rup < 300 km that occurred in southwest China and use reasonable and reliable data processing method to obtain 1600 geometric mean horizontal component of PGV and PGD. We then establish a dataset containing strong motion data and various metadata such as corresponding earthquake sources, distances, and site parameters in southwest China. Based on this dataset, the attenuation relationship of horizontal PGV and PGD, including the effects of magnitude saturation, magnitude-dependent geometric attenuation, linear and nonlinear site response, and inelastic attenuation in southwest China, are obtained by statistical regression. The evaluation of inter-event residual, intra-event residual, and model is carried out. This attenuation relationship of horizontal PGV and PGD is compared with the actual observations, attenuation relationship of horizontal PGV in the Sichuan-Tibet area, and the attenuation relationship of horizontal PGD of NGA-West1. The results show that our model effective in estimating horizontal PGV and PGD for events with 4.0 < M_S≤8.0 and 10 < R < 300 km in southwest China. Most observed PGVs and PGDs of the Wenchuan, Lushan, Ludian, and Jiuzhaigou earthquakes are distributed within ±1 standard deviation of the PGV and PGD attenuation curves of our model. Our model's PGV and PGD attenuation curves clearly show the magnitude-dependent attenuation and the average effect of soil nonlinearity. Compared with the common domestic attenuation relationship and NGA-West1 ground motion model, our model can better reflect the influence of earthquake source characteristics, propagation media, and site nonlinearity on the horizontal PGV and PGD attenuation characteristics in southwest China.
Key words:southwest China/
PGV/
PGD/
Attenuation relationship/
Nonlinear site response



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