| 汶川地震强余震场地非线性反应 |
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| 引用本文： | 姚鑫鑫,任叶飞,温瑞智. 汶川地震强余震场地非线性反应[J]. 地震地磁观测与研究, 2017, 38(2): 104-111. DOI: 10.3969/j.issn.1003-3246.2017.02.019 |
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| 作者姓名： | 姚鑫鑫 任叶飞 温瑞智 |
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| 作者单位： | 1. 中国哈尔滨 150080 中国地震局工程力学研究所;2. 中国哈尔滨 150080 中国地震局地震工程与工程振动重点实验室 |
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| 基金项目： | 中国地震局工程力学研究所基本科研业务费专项（项目编号：2016A04）；地震行业科研专项经费项目（项目编号：201508005）；国家自然科学基金（项目编号：U1534202）；中国地震局创新团队发展计划 |
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| 摘 要： | 采用汶川地震强余震26个强震动台站记录,基于H/V谱比法,计算台站场地的强、弱震作用下场地卓越频率之比R_(fp)和体现强、弱震作用下场地H/V谱比曲线差异程度的DNL,进而识别并分析场地非线性反应特征。结果显示,R_(fp)、DNL与PGA之间存在显著相关性;其中10个台站出现明显的场地非线性反应特征;大部分台站发生场地非线性反应的PGA阈值为100 cm/s~2,部分为50 cm/s~2;实例证明,因某些台站不易通过H/V谱比法识别场地卓越频率,因此采用R_(fp)识别场地非线性反应具有一定局限性。
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| 关 键 词： | 场地非线性反应 PGA阈值 H/V谱比法 汶川地震 强震动台站 |
Identification of the nonlinear site response during the Wenchuan aftershocks |
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| Yao Xinxin,Ren Yefei,Wen Ruizhi. Identification of the nonlinear site response during the Wenchuan aftershocks[J]. Seismological and Geomagnetic Observation and Research, 2017, 38(2): 104-111. DOI: 10.3969/j.issn.1003-3246.2017.02.019 |
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| Authors: | Yao Xinxin Ren Yefei Wen Ruizhi |
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| Affiliation: | 1. Institute of Engineering Mechanics China Earthquake Administration, Harbin 150080, China;2. Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, China |
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| Abstract: | There are so far not any studies systematically focusing on the nonlinear site response for the strong aftershocks of Wenchuan earthquake. The site responses of the 26 strong-motion stations were estimated using their 1539 recordings collected in the Wenchuan earthquake sequence based on the horizontal-to-vertical spectral ratio (HVSR) method. The nonlinear site response was identified by the two indicators, Rfp (the ratio of the predominant frequency of the site response between the strong and weak ground motion), and DNL (the difference degree of HVSR curves which are calculated with strong and weak ground motion data). The both indicators have significant correlations to the peak ground acceleration (PGA). Obvious evidences were found for 10 strong-motion station to show nonlinear site response. It shows that PGA>100 cm/s2 may be a threshold for ground motions generating a shift of the site response from linearity to nonlinearity. The indicator, Rfp, has some limitations to indentify the nonlinear site response in some cases that the site predominant frequency is difficult to be clearly identified. |
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| Keywords: | nonlinear site response PGA threshold horizontal-to-vertical spectral ratio method Wenchuan earthquake strong motion station |
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