一种识别永久位移的新方法
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摘要
分析造成强震加速度记录基线漂移的可能原因,以东日本Mw9.0强震加速度记录为例,由于基线漂移的不确定性以及现有方法在处理日本Mw9.0强震数据的不适用性,提出基于Hermit插值,并以平整度为判别依据确定强震台站永久位移的基线校正方法,参考同震位移的相关数据对比各种方法的基线校正结果,同时选取汶川Ms8.0强震加速度记录进行验证。研究表明:①造成强震加速度记录基线漂移的可能原因比较复杂;②现有基线校正方法通用性不强;③基于Hermit插值的基线校正方法比较合理,拟合精度较高,适用于强震中永久位移的识别。
The possible causes of baseline drift in strong motion acceleration records are analyzed.Taking Mw 9.0 Tohoku earthquake acceleration records as an example,due to the uncertainty of the baseline drift and the imperfect existing methods in the applicability of processing Japanese records,a suitable way based on the Hermit interpolation is introduced.And the flatness can be used to determine the permanent displacement,at the same time,results are compared with the coseismic displacement resulted from the GPS station nearby,which is also tested by Ms 8.0 Wenchuan earthquake acceleration records.It shows that: ① the possible reasons for baseline drift of acceleration records are complicated;② the existing baseline correction methods are not applicable for all records;③ it is reasonable to apply the new baseline correction method based on the Hermit interpolation in the permanent displacement identification,and the fitting accuracy is higher than other ways.
The possible causes of baseline drift in strong motion acceleration records are analyzed.Taking Mw 9.0 Tohoku earthquake acceleration records as an example,due to the uncertainty of the baseline drift and the imperfect existing methods in the applicability of processing Japanese records,a suitable way based on the Hermit interpolation is introduced.And the flatness can be used to determine the permanent displacement,at the same time,results are compared with the coseismic displacement resulted from the GPS station nearby,which is also tested by Ms 8.0 Wenchuan earthquake acceleration records.It shows that: ① the possible reasons for baseline drift of acceleration records are complicated;② the existing baseline correction methods are not applicable for all records;③ it is reasonable to apply the new baseline correction method based on the Hermit interpolation in the permanent displacement identification,and the fitting accuracy is higher than other ways.
引文
[1]叶永田,吴健富.地震引起的永久变位之分布-理论与观测[C].两岸強地动观测暨地震测报研讨会论文集,2004:20-28
[2]Hudson D E,Brady A G,Trifunac M D.Strong-motionearthquake accelerograms,digitized and plotted data[R]//Vol.IA,Earthquake Engineering Research Laboratory,EERL 69-20.Pasadena:California Institute ofTechnology,1969
[3]Trifunac M D.Low frequency digitization errors and a newmethod for zero baseline correction of strong-motionaccelerograms[R].Pasadena,califorinia:CaltechEERL,1970
[4]Chiu H C.Stable baseline correction of digital strong-motion data[J].Bulletin of the Seismological Society ofAmerica,1997,87(4):932-944
[5]Graizer V.determination of the true ground displacementby using strong motion records[J].Earth Physics,1979,15(12):875-885
[6]Iwan W D,Moser M A,Peng C.Some observations onstrong-motion earthquake measurement using a digitalaccelerograph[J].Bulletin of the Seismological Society ofAmerica,1985,75(5):1225-1246
[7]Boore D M.Effect of baseline corrections on displacementsand response spectra for several recordings of the 1999 Chi-Chi,Taiwan,earthquake[J].Bulletin of the SeismologicalSociety of America,2001,91(5):1199-1211
[8]Boore D M,Bommer J J.Processing of strong-motionaccelerograms:needs,options and consequences[J].SoilDynamics and Earthquake Engineering,2005,25:93-115
[9]Wu Y M,Wu C F.Approximate recovery of coseismicdeformation from Taiwan strong-motion records[J].Journal of Seismology,2007,11(2):159-170
[10]Akkar S,Boore D M.On baseline corrections and uncertaintyin response spectra for baseline variations commonlyencountered in digital accelerograph records[J].Bulletin ofthe Seismological Society of America,2009,99(3):1671-1690
[11]王国权.921台湾集集地震近断层地面运动特征[D].北京:中国地震局地质研究所,2001(Wang Guoquan.The characteristics of near fault ground motion caused bythe 1999,Chi-Chi,Taiwan,earthquake[D].Beijing:Institute of Geology,China Earthquake Administration,2001(in Chinese))
[12]于海英,江汶乡,解全才,等.近断层数字强震仪记录误差分析与零线校正方法[J].地震工程与工程振动,2009,29(6):1-12(Yu Haiying,Jiang Wenxiang,XieQuancai,et al.Baseline correction of digital strong-motionrecords in near-field[J].Earthquake Engineering andEngineering Vibration,2009,29(6):1-12(in Chinese))
[13]Zhao J X,Beavan J An X W,et al.A procedure forinteractively processing digital acceleration records toextract permanent displacement and a comparison with GPSdata from the 2010 Darfield earthquake[C]//Proceedingsof the Ninth Pacific Conference on Earthquake EngineeringBuilding an Earthquake-Resilient Society.Auckland,NewZealand,2011:14-16
[14]温瑞智,周宝峰,史大成,等.日本Mw9.0强震动观测与记录初步分析[J].国际地震动态,2011(4):16-21(Wen Ruizhi,Zhou Baofeng,Shi Dacheng,et al.Thestrong group motion observation and data analysis for off thePacific coast of Tohoku earthquake Mw9.0[J].RecentDevelopments in World Seismology,2011(4):16-21(inChinese))
[15]周宝峰.强震观测中的关键技术研究[D].哈尔滨:中国地震局工程力学研究所,2012(Zhou Baofeng.Somekey issues on the strong motion observation[D].Harbin:Institute of Engineering Mechanics,China EarthquakeAdministration,2012(in Chinese))
[16]吴勃英,王德明,丁效华,等.数值分析原理[M].北京:科学出版社,2004
[17]Wu Y M,Wu C F.Approximate recovery of coseismicdeformation form Taiwan strong-motion records[J].Journalof Seismology,2007,11(2):159-170
[2]Hudson D E,Brady A G,Trifunac M D.Strong-motionearthquake accelerograms,digitized and plotted data[R]//Vol.IA,Earthquake Engineering Research Laboratory,EERL 69-20.Pasadena:California Institute ofTechnology,1969
[3]Trifunac M D.Low frequency digitization errors and a newmethod for zero baseline correction of strong-motionaccelerograms[R].Pasadena,califorinia:CaltechEERL,1970
[4]Chiu H C.Stable baseline correction of digital strong-motion data[J].Bulletin of the Seismological Society ofAmerica,1997,87(4):932-944
[5]Graizer V.determination of the true ground displacementby using strong motion records[J].Earth Physics,1979,15(12):875-885
[6]Iwan W D,Moser M A,Peng C.Some observations onstrong-motion earthquake measurement using a digitalaccelerograph[J].Bulletin of the Seismological Society ofAmerica,1985,75(5):1225-1246
[7]Boore D M.Effect of baseline corrections on displacementsand response spectra for several recordings of the 1999 Chi-Chi,Taiwan,earthquake[J].Bulletin of the SeismologicalSociety of America,2001,91(5):1199-1211
[8]Boore D M,Bommer J J.Processing of strong-motionaccelerograms:needs,options and consequences[J].SoilDynamics and Earthquake Engineering,2005,25:93-115
[9]Wu Y M,Wu C F.Approximate recovery of coseismicdeformation from Taiwan strong-motion records[J].Journal of Seismology,2007,11(2):159-170
[10]Akkar S,Boore D M.On baseline corrections and uncertaintyin response spectra for baseline variations commonlyencountered in digital accelerograph records[J].Bulletin ofthe Seismological Society of America,2009,99(3):1671-1690
[11]王国权.921台湾集集地震近断层地面运动特征[D].北京:中国地震局地质研究所,2001(Wang Guoquan.The characteristics of near fault ground motion caused bythe 1999,Chi-Chi,Taiwan,earthquake[D].Beijing:Institute of Geology,China Earthquake Administration,2001(in Chinese))
[12]于海英,江汶乡,解全才,等.近断层数字强震仪记录误差分析与零线校正方法[J].地震工程与工程振动,2009,29(6):1-12(Yu Haiying,Jiang Wenxiang,XieQuancai,et al.Baseline correction of digital strong-motionrecords in near-field[J].Earthquake Engineering andEngineering Vibration,2009,29(6):1-12(in Chinese))
[13]Zhao J X,Beavan J An X W,et al.A procedure forinteractively processing digital acceleration records toextract permanent displacement and a comparison with GPSdata from the 2010 Darfield earthquake[C]//Proceedingsof the Ninth Pacific Conference on Earthquake EngineeringBuilding an Earthquake-Resilient Society.Auckland,NewZealand,2011:14-16
[14]温瑞智,周宝峰,史大成,等.日本Mw9.0强震动观测与记录初步分析[J].国际地震动态,2011(4):16-21(Wen Ruizhi,Zhou Baofeng,Shi Dacheng,et al.Thestrong group motion observation and data analysis for off thePacific coast of Tohoku earthquake Mw9.0[J].RecentDevelopments in World Seismology,2011(4):16-21(inChinese))
[15]周宝峰.强震观测中的关键技术研究[D].哈尔滨:中国地震局工程力学研究所,2012(Zhou Baofeng.Somekey issues on the strong motion observation[D].Harbin:Institute of Engineering Mechanics,China EarthquakeAdministration,2012(in Chinese))
[16]吴勃英,王德明,丁效华,等.数值分析原理[M].北京:科学出版社,2004
[17]Wu Y M,Wu C F.Approximate recovery of coseismicdeformation form Taiwan strong-motion records[J].Journalof Seismology,2007,11(2):159-170
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