[1]金 刚a,王运生b*,史丙新,等.宜宾长宁MS6.0级地震斜坡动力响应特征[J].山地学报,2019,(6):943-954.[doi:10.16089/j.cnki.1008-2786.000484]
　JIN Ganga,WANG Yunshengb*,SHI Bingxin,et al.Characteristics of Seismic Response of the 6.0-Magnitude Earthquake,Changing county of Yibin in Southwest China's Sichuan province[J].Mountain Research,2019,(6):943-954.[doi:10.16089/j.cnki.1008-2786.000484]
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宜宾长宁MS6.0级地震斜坡动力响应特征()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2019年第6期
页码:
943-954
栏目:
研究简报
出版日期:
2019-11-30

文章信息/Info

Title:
Characteristics of Seismic Response of the 6.0-Magnitude Earthquake,Changing county of Yibin in Southwest China's Sichuan province
文章编号:
1008-2786-(2019)6-943-12
作者:
金 刚1a; 王运生1b*; 史丙新2; 罗 越1b; 明伟庭1a
1.成都理工大学 a.环境与土木工程学院; b.地质灾害防治与地质环境保护国家重点实验室,成都 610059; 2. 四川省地震局,成都 610059
Author(s):
JIN Gang1a; WANG Yunsheng1b*; SHI Bingxin2; LUO Yue1b; MING Weiting1a
1. a. College of Environment and Civil Engineering; b. State Key Laboratory of Geo-Hazard Preventionand Geo-Environment Protection,Chengdu University of Technology Chengdu 610000,China; 2. Seismological Bureau of Sichuan Province,Chengdu 610000,China
关键词:
长宁地震;  同震地质灾害;  山体地震动响应
Keywords:
Changning Earthquake;  Co-earthquake Geological Disasters;  Amplification Effect
分类号:
P642~A
DOI:
10.16089/j.cnki.1008-2786.000484
摘要:
地震作用下,山体发生同震地质灾害,在山体特定部位相对集中,破坏程度较大。目前学术界多采取物理模型实验和数值模拟研究这一现象,较少地采取天然地震下记录到的山体地震动响应数据进行分析。长宁MS6.0级主震以及MS5.4级余震触发了布置在石棉南垭河两岸的3台强震监测仪,通过分析记录到的地震数据,结果表明:(1)震级的绝对大小决定了同一监测点峰值加速度和阿里亚斯强度(Arias Intensity)的大小,即呈正相关;(2)覆盖层场地在水平向对地震波能量表现为较为明显的低频放大效应和高频衰减效应,而在垂直向则不明显;(3)覆盖层场地水平方向特征周期远大于基岩场地;(4)山脊部位对地震具有明显的放大效应,表现为山脊处的水平向峰值加速度与阿里亚斯强度的放大;(5)覆盖层场地在三分量上均对峰值加速度和阿里亚斯强度均有放大,尤其是对阿里亚斯强度的放大最为显著。但是放大效应在水平向上要远强于垂直向;(6)地震动响应规律具有极强的方向性,水平向放大效应远强于垂直向。本研究为川西北高烈度山区地震危险性评价提供依据和参考。
Abstract:
Following main and aftershocks of strong earthquakes, mountainous regions are susceptible to geohazards i.e., landslides. Despite persistent efforts to be made in understanding mechanisms of such geohazards through physical and numerical modeling, further efforts still need to investigate the site amplification effects of hillslopes through seismic monitoring. For example, the 2019 Changning earthquake occurred in Changning county of Yibin, Sichuan province, China, with a magnitude of MS 6.0 and followed by many aftershocks of ≤MS 5.4. These events were well recorded in three earthquake monitoring stations located on both bank sides of the Nanya river. To understand the mechanism and response of hillslopes to the main and aftershocks, in this study, detailed analyses of the recorded seismic data had been conducted and confirmed following observations:(1)The earthquake magnitude was positively correlated with magnitude of peak ground acceleration and Arias intensity at the same site;(2)Along the horizontal directions, while confronting seismic wave energy, the soil layer had a more obvious low-frequency amplification and high-frequency attenuation effect compared to direction;(3)The horizontal predominant period of soil site was much longer than that of rock site;(4)The ridge had an apparent amplification effect during the earthquake, which reflected as the amplification of the horizontal peak ground acceleration and Arias intensity;(5)The soil site had an amplification effect on both the peak ground acceleration and Arias intensity of three components, especially on the latter(Arias intensity), with amplification effect much stronger in horizontal directions;(6)The seismic response to mountain hillslopes had a strong directivity, and the amplification effect in the horizontal directions was much stronger than that of the vertical directions. It is believed that the findings of this study would serve as a reference to draw seismic risk assessment in high mountainous areas in northwest Sichuan province.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-07-15; 修回日期(Accepted date):2019-12-15
基金项目(Foundation item):国家自然科学基金(41877235); 地质灾害防治与地质环境保护国家重点实验室自主课题项目(SKLGP2015Z001)。[National Natural Science Foundation of China(41877235); The Independent Fund of State Key Laboratory of Geo-hazard And Geo-Environment Protection( SKLGP2015Z001)]
作者简介(Biography):金刚(1996-),男,河南郑州人,硕士研究生,主要从事地质工程与区域稳定性研究工作。[JIN Gang(1996-),male, Zhengzhou, Henan province, M.sc candidate, majored in geological engineering]E-mail: 825200169@qq.com
更新日期/Last Update: 2019-11-30