| 川滇地区水平向强地震动衰减关系研究 |
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| 引用本文： | 王玉石, 李小军, 周正华. 2013: 川滇地区水平向强地震动衰减关系研究. 地震学报, 35(2): 238-248. DOI: 10.3969/j.issn.0253-3782.2013.02.010 |
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| 作者姓名： | 王玉石 李小军 周正华 |
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| 作者单位： | 1.中国北京 100081 中国地震局地球物理研究所;2.中国南京 210009 南京工业大学交通学院 |
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| 基金项目： | 中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项(DQJB11C25);国家自然科学基金(90715038);地震行业专项(201108003)资助 |
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| 摘 要： | 利用近几年在川滇地区破坏性地震及汶川地震强余震中获得的951条加速度记录， 通过选取合适的衰减关系形式和距离参数， 经统计获得了川滇地区水平向峰值加速度与35个周期点对应的加速度反应谱(阻尼比0.05)衰减关系. 统计结果显示， 震级越大， 地震动随距离的衰减越慢； 加速度反应谱的短周期部分随距离的衰减明显快于长周期部分； 中强地震在近场也会产生较大的峰值加速度和较高的短周期加速度反应谱. 由于统计资料的非完整性， 本文统计结果尚不宜直接应用于相关工程场地的设计地震动参数确定中. 但本文结果与目前由转换方法得到的我国西部地震动参数衰减规律的较大差异提示： 进一步深入研究我国地震动参数衰减规律应是紧迫而重要的任务.
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| 关 键 词： | 川滇地区 强地震动 衰减关系 峰值加速度 加速度反应谱 |
| 收稿时间： | 2012-01-30 |
| 修稿时间： | 2012-06-04 |
Research on attenuation relationships for horizontal strong ground motions in Sichuan--Yunnan region |
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| Wang Yushi, Li Xiaojun, Zhou Zhenghua. 2013: Research on attenuation relationships for horizontal strong ground motions in Sichuan--Yunnan region. Acta Seismologica Sinica, 35(2): 238-248. DOI: 10.3969/j.issn.0253-3782.2013.02.010 |
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| Authors: | Wang Yushi Li Xiaojun Zhou Zhenghua |
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| Affiliation: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2.College of Transportation, Nanjing University of Technology, Nanjing 210009, China |
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| Abstract: | By statistical analyses of 951 sets of acceleration records obtained in several destructive earthquakes and aftershocks of Wenchuan MS8.0 earthquake, the attenuation relationships for peak ground acceleration (PGA) and acceleration response spectra (damping ratio 0.05) in Sichuan--Yunnan region of China were determined with appropriate attenuation relationship formula and distance parameters. The result of this study indicates that the ground motion induced by larger earthquakes attenuated much slower with the increase of distance than that induced by smaller ones, and the acceleration response spectra for shorter periods (0—0.15 s) attenuated more quickly with the increase of distance than that for longer periods (0.2—10 s), which were the two reasons why considerably large PGA and short-period spectrum acceleration were commonly observed in near-field of moderate earthquakes. But these attenuation relationships could not be used in the determination of design ground motion for engineering sites because of the data incompleteness. The significant difference between the result of this study and the attenuation relationship law in western China obtained with conversion method indicates that further research on the attenuation relationship laws in China is an important and pressing task. |
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| Keywords: | Sichuan--Yunnan region strong ground motion attenuation relationship peak ground acceleration acceleration response |
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