2009年姚安6.0级地震强震动应急观测的数据处理及其震害启示
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摘要
对2009年7月9日云南姚安6.0级地震应急流动观测获取的强余震记录进行了处理和分析,包括记录的滤波及零漂处理,5.2级、4.7级、4.6级三次强余震的PGA、PGV、PGD及PSV、PSD以及对应的谱烈度(SI)与相对持时(Td)等的计算及其分析。结果表明:这些强余震近场记录的滤波处理对高频成份影响较大,对低频部分影响很小;加速度峰值主频集中在3～17 Hz;速度峰值对应频率大都为1～8 Hz;谱烈度值为1.5～36.6。4.7级地震水平向峰值加速度为825.3 gal,对应的地震烈度为Ⅹ度,采用IMM标准,对应的地震烈度为Ⅷ度;而其90%、70%的相对能量持时和1/5峰值分数持时的长度分别为1.62 s、0.64 s和0.92 s;最大加速度峰值与对应的谱烈度值之比值,亦仅列众强余震的第6位。对此次强震动记录与地震灾害的相关问题进行了讨论。
The data gained by emergency mobile strong-motion observation of the aftershock of Yao'an M6.0 earthquake on July 9,2009 are processed and analyzed,including filtering,baseline correction of their acceleration trace,calculation of the PGA,PGV,PGD,PSV,PSD,spectrum intensity(SI) and Td of M5.2,M4.7 and M4.6 aftershocks.The results indicate that filter processing of the near field records of aftershocks evidently affects the high frequency component,but its effect on the low frequency component is little;The main frequency of acceleration concentrates in 3～18 Hz;The main frequency of speed is between 1～8 Hz;Spectrum intensity values are between 1.5～36.6.The horizontal acceleration peak value of M4.7 aftershock is 825.3 gal and the corresponding seismic intensity is Ⅹ;but its IMM is intensity Ⅷ.The 90% and 70% of relative duration of ground motion and 1/5 of peak value dispersion duration respectively are 1.62 s,0.64 s and 0.92 s;The ratio of the maximum acceleration peak value to the corresponding spectrum intensity value is only arranged 6th in the strong aftershocks.The records of strong motion and earthquake damage are discussed.
The data gained by emergency mobile strong-motion observation of the aftershock of Yao'an M6.0 earthquake on July 9,2009 are processed and analyzed,including filtering,baseline correction of their acceleration trace,calculation of the PGA,PGV,PGD,PSV,PSD,spectrum intensity(SI) and Td of M5.2,M4.7 and M4.6 aftershocks.The results indicate that filter processing of the near field records of aftershocks evidently affects the high frequency component,but its effect on the low frequency component is little;The main frequency of acceleration concentrates in 3～18 Hz;The main frequency of speed is between 1～8 Hz;Spectrum intensity values are between 1.5～36.6.The horizontal acceleration peak value of M4.7 aftershock is 825.3 gal and the corresponding seismic intensity is Ⅹ;but its IMM is intensity Ⅷ.The 90% and 70% of relative duration of ground motion and 1/5 of peak value dispersion duration respectively are 1.62 s,0.64 s and 0.92 s;The ratio of the maximum acceleration peak value to the corresponding spectrum intensity value is only arranged 6th in the strong aftershocks.The records of strong motion and earthquake damage are discussed.
引文
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[23]李山有,金星,陈先,等.地震动强度与地震烈度速报研究[J].地震工程与工程振动,2002,22(6):2-8.
[24]李山有,金星,马强,等.地震预警系统与智能应急控制系统研究[J].世界地震工程,2004,20(4):21-26.
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[28]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB50011-2001建筑抗震设计规范[S].北京:中国建筑出版社,2008.
[2]李世成,崔建文,张潜,等.姚安6.0级强震动流动观测[J].地震研究,2011,35(3):322-330.
[3]李小军,周正华,于海英,等.汶川8.0级地震强震动观测及记录初步分析[C]//汶川地震建筑震害调查与灾后重建分析报告.北京:中国建筑工业出版社,2008.
[4]谢礼立,于双久.强震观测与分析原理[M].北京:地震出版社,1982.
[5]Boore D M,Stephens C D,Joyner W B.Comments on baselinecorrection of digital strong motion data:Examples from the 1999Hector Mine,California,earthquake[J].BSSA,2002,92(4):1543-1560.
[6]Boore D M,Bommer J J.Processing of strong-motion accelero-gram:needs,options and consequences[J].Soil Dynamics andEarthquake Engineering,2005,25(2):93-115.
[7]温瑞智,周正华,李小军,等.汶川M8.0地震的强余震流动观测[J].地震学报,2009,31(4):220-224.
[8]张晓志,谢礼立.强震记录仪器响应失真校正的权函数方法──时域离散序列数值分析方法与应用研究之二[J].世界地震工程,2001(1):1-8.
[9]崔建文,李世成,高东,等.云南分区地震动衰减关系[J].地震研究,2006,29(4):386-391.
[10]李世成,张潜,崔建文,等.2008年攀枝花M6.1地震余震的强震动观测[J].地震研究,2009,32(S0):449-455.
[11]GB/T17742-2008中国地震烈度表[S].北京:中国标准出版社,2008.
[12]Wald D J,Quitoriano V,Heaton T H,etal.Relationships be-tween peak ground acceleration,peak ground velocity,and modi-fied Mercalli intensity in California[J].Earthquake Spectra,1999,15:537-556.
[13]Trifunac M D,Bradey A G.On the correlation of peak accelera-tion of strong motion with earthquake magnitude epicentral dis-tance and site condition Proc[C]//US Nat Conf Earthquake En-gineering.1975:43-52.
[14]Japan Meteorological Agency Seismic Intensity Scale[EB/OL].[2010-09-28].http://en.wikipedia.org/wiki/JMASIS.
[15]Housner G W.Characteristics of strong motion of earthquakes[J].BSSA,1947,37(1):19-31.
[16]张潜,李世成,崔建文,等.盈江5.9级地震强震动谱烈度研究[J].地震研究,2009,33(S0):460-463.
[17]胡聿贤.地震工程学[M].北京:地震出版社,2006:44-201.
[18]金星,张红才,韦永祥.基于地震台网资料快速发布的震动烈度标准及其应用研究[J].国际地震动态,2008(10):20-27.
[19]Boatwright J,Bundock H,Luetgert J,et al.The dependence ofPGAand PGV on distance and magnitude inferred form NorthernCalifornia shakemap data[J].BSSA,2003,93(5):2043-2055.
[20]徐杨,罗词建,李小军,等.汶川8.0级地震陕西省数字强震动记录分析[J].震灾防御技术,2009,4(4):363-272.
[21]李小军.对近年大震震害现象与工程地震问题研究的思考[J].国际地震动态,2001(8):26-31.
[22]李世成,崔建文,韩新民.云南地区地震烈度衰减特征研究[J].中国地震,2003,19(3):287-294.
[23]李山有,金星,陈先,等.地震动强度与地震烈度速报研究[J].地震工程与工程振动,2002,22(6):2-8.
[24]李山有,金星,马强,等.地震预警系统与智能应急控制系统研究[J].世界地震工程,2004,20(4):21-26.
[25]赵纪东,张志强.地震预警系统的发展、应用及启示[J].地质通报,2009,28(4):456-462.
[26]中国国家标准化管理委员会.GB/T18306-2001中国地震动参数区划图[S].北京:中国标准出版社,2001.
[27]中华人民共和国国家质量监督检验检疫局,中国国家标准化管理委员会.GB/T17741-2005工程场地地震安全性评价[S].北京:中国标准出版社,2005.
[28]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB50011-2001建筑抗震设计规范[S].北京:中国建筑出版社,2008.
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