岷县漳县6.6级地震极震区峰值加速度估算
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摘要
简述了2013年7月22日岷县漳县6.6级地震极震区破坏特;针对调查中发现的砖柱铁门地震破坏现象,应用力学分析原理估算了极震区地震水平峰值加速度。估算结果表明,极震区禾驮乡拉路村地震水平峰值加速度在5.1～5.4m/s2,即0.52～0.55g左右,大于《中国地震烈度表》Ⅷ度区参考的水平向地震峰值加速度,这可能与研究区黄土及山坡的双重放大效应有关。因此在灾后恢复重建及该区未来的抗震设防中应考虑这两方面的作用影响。
The horizontal peak ground acceleration(PGA)distribution in an earthquake is a very important parameter and can be used as a reference for the determination of seismic intensity.In Minxian-Zhangxian MS6.6 earthquake disaster region,there is only Minxian seismostation in intensityⅦregion got the seismic records and in intensity Ⅷ region there is no seismic record.During site investigation,a kind of brick doorpost was noticed in Lalu village in Hetuo town,meizoseismal area.The doorpost with iron door broke in the earthquake and the doorpost without iron door kept in good condition,which can be used to estimate the PGA in this area.Based on the field investigation,the destruction features in meizoseismal area of the Minxian-Zhangxian MS6.6 Earthquake are sketched and the damage to the brick doorpost with iron door in earthquake are described and analysed.The seismic intensityⅧregion is about 706km2 and the most serious damage area include Yongguang,Yongxing and Lalu villages,most of them located in the high half slope covered by thick loess.According to the characteristics of the doorpost and its break,the earthquake horizontal PGA was estimated by mechanics analysis theory using a simplified strut-node model,which can be used as a reference for seismic intensity division and post-disaster reconstruction design.The results show that the earthquake horizontal PGA of Lalu village in Hetuo town,meizoseismal area,is up to 5.1～5.4m/s2,namely 0.52～0.55g,which is much greater than the reference value of eight-degree region in the Chinese Earthquake Intensity Scale.Judging by the related study about the influence of local topography on ground motion in mountain region of southern Gansu province and the seismic records observed on Shangcheng platform in Wenxian during Wenchuan MS8.0earthquake,the high PGA may be caused by the amplification effects of both high mountain slope and thick loess in study area.Compared with the PGA value of seismic record by seismostation in Minxian-Zhangxian MS6.6 earthquake and Lushan MS7.0earthquake,the PGA value is usually much higher than the reference value in the Chinese Earthquake Intensity Scale of the same intensity region.Therefore,these two effects should be considered for the post-disaster reconstruction and seismic fortification in the future and the fortification criterion should be increased for villages in high half slope area.
The horizontal peak ground acceleration(PGA)distribution in an earthquake is a very important parameter and can be used as a reference for the determination of seismic intensity.In Minxian-Zhangxian MS6.6 earthquake disaster region,there is only Minxian seismostation in intensityⅦregion got the seismic records and in intensity Ⅷ region there is no seismic record.During site investigation,a kind of brick doorpost was noticed in Lalu village in Hetuo town,meizoseismal area.The doorpost with iron door broke in the earthquake and the doorpost without iron door kept in good condition,which can be used to estimate the PGA in this area.Based on the field investigation,the destruction features in meizoseismal area of the Minxian-Zhangxian MS6.6 Earthquake are sketched and the damage to the brick doorpost with iron door in earthquake are described and analysed.The seismic intensityⅧregion is about 706km2 and the most serious damage area include Yongguang,Yongxing and Lalu villages,most of them located in the high half slope covered by thick loess.According to the characteristics of the doorpost and its break,the earthquake horizontal PGA was estimated by mechanics analysis theory using a simplified strut-node model,which can be used as a reference for seismic intensity division and post-disaster reconstruction design.The results show that the earthquake horizontal PGA of Lalu village in Hetuo town,meizoseismal area,is up to 5.1～5.4m/s2,namely 0.52～0.55g,which is much greater than the reference value of eight-degree region in the Chinese Earthquake Intensity Scale.Judging by the related study about the influence of local topography on ground motion in mountain region of southern Gansu province and the seismic records observed on Shangcheng platform in Wenxian during Wenchuan MS8.0earthquake,the high PGA may be caused by the amplification effects of both high mountain slope and thick loess in study area.Compared with the PGA value of seismic record by seismostation in Minxian-Zhangxian MS6.6 earthquake and Lushan MS7.0earthquake,the PGA value is usually much higher than the reference value in the Chinese Earthquake Intensity Scale of the same intensity region.Therefore,these two effects should be considered for the post-disaster reconstruction and seismic fortification in the future and the fortification criterion should be increased for villages in high half slope area.
引文
[1]中国地震局.甘肃岷县漳县6.6级地震烈度图[OB/OL].2013,http://www.csi.ac.cn/manage/html/4028861611c5c2ba0111c5c558b00001/_content/13_07/25/1374717758449.html.Chinese earthquake administration.Seismic intensity map of Minxian-Zhangxian 6.6earthquake in Gansu[OB/OL].2013(http://www.csi.ac.cn/manage/html/4028861611c5c2ba0111c5c558b00001/_content/13_07/25/1374717758449.html).(in Chinese)
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[9]乔震元,刘本玉,张远富.汶川8.0级地震峰值地震动特性研究[J].西北地震学报,2011,33(1):91-95.QIAO Zhen-yuan,LIU Ben-yu,ZHANG Yuan-fu.Research on the Peak Ground Motion Characteristics of Wenchuan MS8.0 Earthquake[J].Northwestern Seismological Journal,2011,33(1):91-95.(in Chinese)
[2]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.中华人民共和国国家标准《中国地震烈度表》(GB/T 17742-2008)[S].北京:中国标准出版社,2008.State Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,China National Standardization Management Committee.The State Standard of the People's Republic of China-China Seismic Intensity Scale(GB/T 17742-2008)[S].Beijing:China Standard Press,2008.(in Chinese)
[3]国家质量技术监督局.中华人民共和国国家标准《烧结普通砖》(GB/T 5101-1998)[S].北京:中国标准出版社,1998.State Bureau of Quality and Technical Supervision.The State Standard of the People's Republic of China-Fired common Bricks(GB/T 5101-1998)[S].Beijing:China Standard Press,1998.(in Chinese)
[4]高桂兰,赵子赢,沈成忠.浅谈砂浆强度与砌体强度[J].煤炭技术,2004,23(8):77-78.GAOo Gui-lan,ZHAO Zi-ying,SHEN Cheng-zhong.Talking about the Strength of Mortar and Masonry[J].Coal Technology,2004,23(8):77-78.(in Chinese)
[5]杨柳德,周志荣.浅谈砂浆强度和砌体强度的影响因素[J].山西建筑,2009,35(23):69-70.YANG Liu-de,ZHOU Zhi-rong.Discussing the Influence Factors of Mortar and Masonry Strength[J].Shanxi Architecture,2009,35(23):69-70.(in Chinese)
[6]盛志强,卢育霞,石玉成,等.河谷地形的地震反应分析[J].地震工程学报,2013,35(1):126-132.SHENG Zhi-qiang,LU Yu-xia,SHI Yu-cheng,et al.Seismic Response Analysis of Vally Topography[J].China Earthquake Engineering Journal,2013,35(1):126-132.(in Chinese)
[7]孙崇绍,闵祥仪,周民都.陇南山区局部地形对地震动强度的影响[J].西北地震学报,2011,33(4):331-335.SUN Chong-shao,MIN Xiang-yi,ZHOU Min-du.Influence of Local Topography on Ground Motion in Mountain Region of Southern Gansu Province[J].Northwestern SeismologicalJournal,2011,33(4):331-335.(in Chinese)
[8]卢育霞,刘琨,石玉成,等.甘肃文县上城台地的地震记录分析[J].西北地震学报,2011,33(增):393-397.LU Yu-xia,LIU Kun,SHI Yu-cheng,et al.Analysis on Seismic Records Observed on Shangcheng Platform in Wenxian,Gansu Province[J].Northwestern Seismological Journal,2011,33(Supp1):393-397.(in Chinese)
[9]乔震元,刘本玉,张远富.汶川8.0级地震峰值地震动特性研究[J].西北地震学报,2011,33(1):91-95.QIAO Zhen-yuan,LIU Ben-yu,ZHANG Yuan-fu.Research on the Peak Ground Motion Characteristics of Wenchuan MS8.0 Earthquake[J].Northwestern Seismological Journal,2011,33(1):91-95.(in Chinese)
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