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Attenuation of peak ground accelerations from the great Wenchuan earthquake

ISSN号：1671-3664
期刊名称：《地震工程与工程振动：英文版》
时间：0
分类：P315.9[天文地球—地震学;天文地球—固体地球物理学;天文地球—地球物理学] S792.11[农业科学—林木遗传育种;农业科学—林学]
作者机构：[1]Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China, [2]School of Civil Engineering and Architecture, Harbin Institute of Technology, Harbin 150090, China
相关基金：Supported by： National Natural Science Foundation of China Under Grant No. 90715038, 50878199 and 50808166; National Basic Research Program of China Under Grant No. 2007CB714200 Acknowledgment We sincerely thank the people who installed and maintained the accelerographs. The authors express their gratitude to Prof. Yu Haiying for his kindness in providing the recordings used in this study. We are also very grateful to the experts in the Seismological Bureaus of Provinces of Sichuan, Gansu, Shanxi, etc., for supplying the site conditions, and we would like to thank all who contributed to the success in recording, collecting and processing data in the Wenchuan Earthquake. We also gratefully acknowledge the constructive comments and suggestions of Wang Haiyun, Hu Jinjun, and the two anonymous reviewers.

关键词：峰值加速度, 衰减关系, 地震, 汶川, 组成部分, 立地条件, 地面运动, 生理盐水, Wenchuan earthquake, peak ground acceleration （PGA）, attenuation, rupture distance, azimuth

中文摘要：

在 Wenchuan 地震期间由 272 个地面级的车站记录的超过 800 accelerograms 被用来在山峰地面加速(针网阵列) 上分析破裂距离，本地地点条件和方位角的影响。为了完成地面运动， EW 的空间分布， NS 和 UD 的特征的更好的理解，针网阵列的部件被获得。在 EW 和 NS 部件，差错正常和差错平行部件，和针网阵列的垂直、水平的部件之间的比较被执行，并且针网阵列的 vertical-to-horizontal 比率的回归公式被开发。山峰的变细关系水平加速(公众房产管理局) 与几种当代的变细关系相比。另外，剩余的分析被进行在公众房产管理局的观察价值上识别破裂距离，方位角和地点条件的潜在的效果。分析集中于媒介难的土壤地点条件，当他们提供了大多数在这研究使用的数据。

英文摘要：

Over 800 accelerograms recorded by 272 ground-level stations during the Wenchuan earthquake are used to analyze the influence of rupture distance, local site conditions and azimuth on peak ground accelerations （PGAs）. To achieve a better understanding of the characteristics of ground motions, the spatial distributions of the EW, NS and UD components of PGAs are obtained. Comparisons between the EW and NS components, the fault-normal and fault-parallel components, and the vertical and horizontal components of PGAs are performed, and the regression formula of the vertical-to-horizontal ratio of PGAs is developed. The attenuation relationship of peak horizontal accelerations （PHAs） is compared with several contemporary attenuation relationships. In addition, an analysis of residuals is conducted to identify the potential effects of rupture distance, azimuth and site conditions on the observed values of PHAs. The analysis focuses on medium-hard soil site conditions, as they provided most of the data used in this study.

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