青海门源5.1级地震强震动记录及初步分析
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摘要
对西北强震动台网中心收集的2013年9月20甘肃肃南与青海门源交界5.1级地震的44组三分向加速度记录进行了处理和初步分析,给出了126条零基线校正后的三分向峰值加速度值。距震中37km的63MEY台加速度峰值约为50gal,可得出该次地震震中烈度约为Ⅴ度,与震后的实际调查结果基本一致;选取了近场典型台站的加速度记录进行分析,绘制出了校正后的加速度时程曲线以及加速度反应谱,反应谱幅度及卓越周期的差别体现了震中距对地震传播和地震在不同场地环境中的影响。
The Northwestern Strong Motion Network Center is the strong-motion network data collection center for five provinces(Shaanxi,Gansu,Ningxia,Qinghai,Xinjiang)of northwestern China,and is responsible for the release of regional destructive-earthquake ground-motion information.An MS5.1earthquake occurred at the junction of Sunan county,Zhangye city,Gansu province and Menyuan county,Qinghai province on September 20,2013,and the mainshock records of this earthquake obtained from 43strong-motion stations of the Northwestern Strong Motion Network are presented in the paper.The 43 strong motion stations are installed in Gansu,Qinghai province,and include two types of strong-motion seismographs:the MR2002 and ETNA.126 peak ground accelerations recorded by strong motion stations had been calculated after the zero baseline was corrected.The 63 MEY strong-motion station was closest to the epicenter,at a distance of 37.1km,with a peak ground acceleration of 40.9gal(EW),29.1gal(NS),and 17.5gal(UD).The farthest station from the epicenter was 63 TGM,at a distance of 220 km,with a peak ground acceleration of 1.5gal(EW),1.5gal(NS),and 0.9gal(UD).The effects of anisotropic media and site conditions may have resulted in unequal peak ground acceleration values for different locations with the same epicentral distance.The result is similar to the actual survey results after the earthquake,and therefore,the rapid reporting of intensity is very useful for earthquake emergency rescues.The acceleration records of these 43 stations substantially enhance the digital recording of the near-field strong-motion observations in the loess areas,and also provide fundamental data on seismic fortification,site effects,and intensity attenuation.
The Northwestern Strong Motion Network Center is the strong-motion network data collection center for five provinces(Shaanxi,Gansu,Ningxia,Qinghai,Xinjiang)of northwestern China,and is responsible for the release of regional destructive-earthquake ground-motion information.An MS5.1earthquake occurred at the junction of Sunan county,Zhangye city,Gansu province and Menyuan county,Qinghai province on September 20,2013,and the mainshock records of this earthquake obtained from 43strong-motion stations of the Northwestern Strong Motion Network are presented in the paper.The 43 strong motion stations are installed in Gansu,Qinghai province,and include two types of strong-motion seismographs:the MR2002 and ETNA.126 peak ground accelerations recorded by strong motion stations had been calculated after the zero baseline was corrected.The 63 MEY strong-motion station was closest to the epicenter,at a distance of 37.1km,with a peak ground acceleration of 40.9gal(EW),29.1gal(NS),and 17.5gal(UD).The farthest station from the epicenter was 63 TGM,at a distance of 220 km,with a peak ground acceleration of 1.5gal(EW),1.5gal(NS),and 0.9gal(UD).The effects of anisotropic media and site conditions may have resulted in unequal peak ground acceleration values for different locations with the same epicentral distance.The result is similar to the actual survey results after the earthquake,and therefore,the rapid reporting of intensity is very useful for earthquake emergency rescues.The acceleration records of these 43 stations substantially enhance the digital recording of the near-field strong-motion observations in the loess areas,and also provide fundamental data on seismic fortification,site effects,and intensity attenuation.
引文
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[10]李青梅,李惠智.宁夏数字强震动台网记录的汶川8.0级地震加速度资料分析[J].高原地震,2011,23(2):237-241.LI Qing-mei,LI Hui-zhi.Analysis On Acceleration of WenChuan 8.0Earthquake Recorded By Ningxia Digital Strong Motion Network[J].Plateau Earthquake Research,2011,23(2):237-241.(in Chinese)
[11]田秀丰,李佐唐,徐钦.甘肃岷县漳县6.6级地震强震动观测记录与初步分析[J].地震工程学报,2013,35(3):497-502.TIAN Xiu-feng,LI Zuo-tang,XU Qin.The Strong Motion Records and Preliminary Analysis for Minxian-Zhangxian MS6.6Earthquake in Gansu Province[J].China Earthquake Engineering Journal,2013,35(3):497-502.(in Chinese)
[12]于海英,王栋,杨永强,等.汶川8.0级地震强震动加速度记录的初步分析[J].地震工程与工程振动,2009,29(6):2-13.YU Hai-ying,WANG Dong,YANG Yong-qiang,et al.The Preliminary Analysis of Strong Ground Motion Records form the MS8.0 Wenchuan Earthquake[J].Earthquake Engineering and Engineering Vibration,2009,29(6):2-13.(in Chinese)
[13]何少林,陈文凯,李佐唐,等.2003年10月25日民乐山丹MS6.1、5.8地震加速度记录特征分析[J].地震研究,2006,29(2):157-161.HE Shao-lin,CHEN Wen-kai,LI Zuo-tang,et al.Analysis on Characteristics of Acceleration Records of the Minle-Shandan MS6.1,5.8 Earthquakes on Oct.25,2003[J].Seismological Research,2006,29(2):157-161.(in Chinese)
[2]陈鹏,刘文锋,付兴潘.关于场地卓越周期和特征周期的若干讨论[J].青岛理工大学学报,2009,30(6):30-36.CHEN Peng,LIU Wen-feng,FU Xin-pan.Discussions on Site Predominant Period and Characteristic Period.[J].Qingdao Technological University,2009,30(6):30-36.(in Chinese)
[3]黄旭涛,温瑞智,任叶飞.2013年7月22日岷县漳县6.6级地震强震记录及特征分析[J].地震工程学报,2013,35(3):489-496.HUANG Xu-tao,WEN Rui-zhi,REN Ye-fei.Strong Motion Records and Its Characteristics in Minxian-Zhangxian MS6.6Earthquake on July 22,2013[J].China Earthquake Engineering Journal,2013,35(3):489-496.(in Chinese)
[4]周荣军,赖敏,李大虎.2011年4月10日四川炉霍MS5.3地震强震记录与震害特点[J].成都理工大学学报,2013,40(2):217-223.ZHOU Rong-jun,LAI Min,LI Da-hu.Strong Motion Records and Characteristics of Earthquake Damages of MS5.3Earthquake Occuerred in Luhuo,Sichuan,China,on April 10,2011[J].Journal of Chendu Uinversity of Technology,2013,40(2):217-223.(in Chinese)
[5]姚凯,王兰民,张志坚.黄土覆盖山地对岷县、漳县MS6.6地震余震动力响应的影响[J].地震工程学报,2013,35(4):768-773.YAO Kai,WANG Lan-min,ZHANG Zhi-jian.Influence of Aftershocks of the Minxian-Zhangxian MS6.6Earthquake in a Loess-rich,Hilly Region,2013[J].China Earthquake Engineering Journal,2013,35(3):489-496.(in Chinese)
[6]张振斌,魏斌.新疆新源和静交界MS6.6地震强震动观测记录初步分析[J].内陆地震2012,26(4):354-362.ZHANG Zhen-bin,WEI Bin.A Preliminary Analysis of Strong Motion Observation in Xinyun,Hejing Earthquake with MS6.6[J].Inland Earthquake,2012,26(4):354-362.(in Chinese)
[7]周正华,周雍年,赵刚.强震近场加速度峰值比和反应谱统计分析[J].地震工程与工振动,2002,22(3):16-18.ZHOU Zheng-hua,ZHOU Yong-nian,ZHAO Gang.Statistical Analysis of Peak Ratios and Response Spectra of Near Field Accelerograms[J].Earthquake Engineering and Engineering Vibration,2002,22(3):16-18.(in Chinese)
[8]何少林,闵祥义.2002年12月17日玉门ML4.5地震的强震仪多条记录资料分析[J].西北地震学报,2004,26(3):275-279.HE Shao-lin,Min Xiang-yi.Analysis of Records of Strong Motion Accelerograph In Yumen ML4.5Earthquake on Dec.17,2002[J].Northwestern Seismological Journal,2004,26(3):275-279.(in Chinese)
[9]金星,康兰池,欧益萍.福建地区中小地震加速度反应谱衰减规律[J].地震工程与工程振动,2009,29(5):52-58.JIN Xing,KANG Lan-chi,OU Yi-ping.Acceleration Spectrum Attenuation Relation for Small and Moderate Earthquakes in Fujian Region[J].Earthquake Engineering and Engineering Vibration,2009,29(5):52-58.(in Chinese)
[10]李青梅,李惠智.宁夏数字强震动台网记录的汶川8.0级地震加速度资料分析[J].高原地震,2011,23(2):237-241.LI Qing-mei,LI Hui-zhi.Analysis On Acceleration of WenChuan 8.0Earthquake Recorded By Ningxia Digital Strong Motion Network[J].Plateau Earthquake Research,2011,23(2):237-241.(in Chinese)
[11]田秀丰,李佐唐,徐钦.甘肃岷县漳县6.6级地震强震动观测记录与初步分析[J].地震工程学报,2013,35(3):497-502.TIAN Xiu-feng,LI Zuo-tang,XU Qin.The Strong Motion Records and Preliminary Analysis for Minxian-Zhangxian MS6.6Earthquake in Gansu Province[J].China Earthquake Engineering Journal,2013,35(3):497-502.(in Chinese)
[12]于海英,王栋,杨永强,等.汶川8.0级地震强震动加速度记录的初步分析[J].地震工程与工程振动,2009,29(6):2-13.YU Hai-ying,WANG Dong,YANG Yong-qiang,et al.The Preliminary Analysis of Strong Ground Motion Records form the MS8.0 Wenchuan Earthquake[J].Earthquake Engineering and Engineering Vibration,2009,29(6):2-13.(in Chinese)
[13]何少林,陈文凯,李佐唐,等.2003年10月25日民乐山丹MS6.1、5.8地震加速度记录特征分析[J].地震研究,2006,29(2):157-161.HE Shao-lin,CHEN Wen-kai,LI Zuo-tang,et al.Analysis on Characteristics of Acceleration Records of the Minle-Shandan MS6.1,5.8 Earthquakes on Oct.25,2003[J].Seismological Research,2006,29(2):157-161.(in Chinese)
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