数字加速度记录基线校正相关问题的初步研究
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摘要
指出零线调整中使用整个事前部分计算均值存在的问题,提出了使用地震动到达之前的地脉动记录来计算均值,通过对比说明后者更合适并解释了原因。把漂移现象总体分成线段式和曲线式,分析了两种类型的特点和相应的分析方法,对于既有曲线式漂移的校正所使用的二次曲线拟合法提出了修正和应用,并指出了大崎顺彦校正方法的优缺点和使用限制。讨论了难以确定漂移起始时刻的事例,提出了可能的原因和处理方案。
The shortcoming of zeroth-order correction using the whole pre-event to calculate the mean is pointed out,and the earth pulsation before the earthquake arriving is proposed to replace it.Comparison shows that the later is preferable since it avoids possible uneven records.The drifting is classified into line segment type and curve type,and their corresponding characteristics and correction methods are discussed.The existing quadratic fitting method is modified and applied.Merit and demerit of Ohsaki Yorihiko correction methods are analyzed.Difficulties in deciding starting time of drifting are discussed,and possible reasons and solutions are presented.
The shortcoming of zeroth-order correction using the whole pre-event to calculate the mean is pointed out,and the earth pulsation before the earthquake arriving is proposed to replace it.Comparison shows that the later is preferable since it avoids possible uneven records.The drifting is classified into line segment type and curve type,and their corresponding characteristics and correction methods are discussed.The existing quadratic fitting method is modified and applied.Merit and demerit of Ohsaki Yorihiko correction methods are analyzed.Difficulties in deciding starting time of drifting are discussed,and possible reasons and solutions are presented.
引文
[1]Trifunac MD,Udwadia F E,Brady A G.Analysis of errors in digital strong-motion accelerograms[J].Bulletin of Seismology Society of Ameri-ca,1973,63(1):157-187.
[2]Trifunac MD.A note on correction of strong-motion accelerograms for instrument reponse[J].Bulletin of Seismology Society of America,1972,62(2):401-409.
[3]Douglas J.What is a poor quality strong-motion record[J].Bulletin of Earthquake Engineering,2003,1(1):141-156.
[4]Iwan W D,Moser MA,Chia-Yen Peng.Some observations on strong-motion earthquake measurement using a digital accelerograph[J].Bulletinof Seismology Society of America,1985,75(5):1225-1245.
[5]Boore D M.Effect of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi,Taiwan,earthquake[J].Bulletin of Seismology Society of America,2001,91(5):1199-1211.
[6]Boore D M,Stephens C D,Joyner W B.Comments on baseline correction of digital strong-motion data:Examples form the 1999 Hector Mine,California,earthquake[J].Bulletin of Seismology Society of America,2002,92(4):1543-1560.
[7]Boore D M,Bommer J J.Processing of strong-motion accelerograms:needs,options and sonsequences[J].Soil Dynamics and Earthquake Engi-neering,2005,25(2):93-115.
[8]Graizer V M.Effect of tilt on strong motion data processing[J].Soil Dynamics and Earthquake Engineering,2005,25(3):197-204.
[9]Graizer V M.Tilts in strong ground motion[J].Bulletin of Seismology Society of America,2006,96(6):2090-2102.
[10]大崎顺彦.地震动的谱分析入门[M],田琪译(第二版).北京:地震出版社,2008.
[11]Chen Shen-Ming,Loh Chin-Hsiung.Estimating permanent ground displacement form near-fault strong-motion accelerograms[J].Bulletin of Seis-mology Society of America,2007,97(1b):63-75.
[12]王国权,周锡元.921台湾集集地震近断层强震记录的基线校正[J].地震地质,2004,26(1):1-14.
[13]于海英,江汶香.近场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.
[2]Trifunac MD.A note on correction of strong-motion accelerograms for instrument reponse[J].Bulletin of Seismology Society of America,1972,62(2):401-409.
[3]Douglas J.What is a poor quality strong-motion record[J].Bulletin of Earthquake Engineering,2003,1(1):141-156.
[4]Iwan W D,Moser MA,Chia-Yen Peng.Some observations on strong-motion earthquake measurement using a digital accelerograph[J].Bulletinof Seismology Society of America,1985,75(5):1225-1245.
[5]Boore D M.Effect of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi,Taiwan,earthquake[J].Bulletin of Seismology Society of America,2001,91(5):1199-1211.
[6]Boore D M,Stephens C D,Joyner W B.Comments on baseline correction of digital strong-motion data:Examples form the 1999 Hector Mine,California,earthquake[J].Bulletin of Seismology Society of America,2002,92(4):1543-1560.
[7]Boore D M,Bommer J J.Processing of strong-motion accelerograms:needs,options and sonsequences[J].Soil Dynamics and Earthquake Engi-neering,2005,25(2):93-115.
[8]Graizer V M.Effect of tilt on strong motion data processing[J].Soil Dynamics and Earthquake Engineering,2005,25(3):197-204.
[9]Graizer V M.Tilts in strong ground motion[J].Bulletin of Seismology Society of America,2006,96(6):2090-2102.
[10]大崎顺彦.地震动的谱分析入门[M],田琪译(第二版).北京:地震出版社,2008.
[11]Chen Shen-Ming,Loh Chin-Hsiung.Estimating permanent ground displacement form near-fault strong-motion accelerograms[J].Bulletin of Seis-mology Society of America,2007,97(1b):63-75.
[12]王国权,周锡元.921台湾集集地震近断层强震记录的基线校正[J].地震地质,2004,26(1):1-14.
[13]于海英,江汶香.近场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.
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