鄂尔多斯地块地壳内S波衰减特征的研究
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摘要
采用分布于鄂尔多斯地块及其周缘的32个地震台站记录到的19次地震事件共487条数字化波形记录,利用遗传算法反演得到了整个鄂尔多斯地块地壳内S波的三段几何扩散参数、S波非弹性衰减Q值随频率变化的关系式、32个台站的场地响应以及19次地震的震源参数.计算结果表明,鄂尔多斯地块地壳内S波非弹性衰减在1Hz处的Q值比地质构造活跃地区的结果要大得多.32个地震台站的场地响应在高频部分除个别台站外基本没有表现出明显的放大效应,但在低频区间部分台站之间有一定的差异.19次地震事件的地震矩对数值与震级ML有很好的线性关系.
We present attenuation characteristics of S waves in the crust of Ordos Massif. Using 487 pieces of digital oscillograms of 19 seismic events recorded at 32 seismologic stations located on Ordos massif and its surroundings, we calculate the parameters of three segments attenuation and the relation of inelastic attenuation Q value with frequency in the crust of Ordos Massif, the site responses of 32 stations and the source parameters of 19 events by the genetic algorithm. The result shows that: Q value at 1 Hz of S waves in the crust of Ordos Massif is much larger than the result in the geologically active tectonic region. The site responses of 32 stations in the high-frequency section do not show clear amplifying effect except one or two stations, while in the low-frequency section, there is difference among the stations. The logarithmic value of seismic moment and the magnitude M_L of 19 seismic events has a very good linear relationship.
We present attenuation characteristics of S waves in the crust of Ordos Massif. Using 487 pieces of digital oscillograms of 19 seismic events recorded at 32 seismologic stations located on Ordos massif and its surroundings, we calculate the parameters of three segments attenuation and the relation of inelastic attenuation Q value with frequency in the crust of Ordos Massif, the site responses of 32 stations and the source parameters of 19 events by the genetic algorithm. The result shows that: Q value at 1 Hz of S waves in the crust of Ordos Massif is much larger than the result in the geologically active tectonic region. The site responses of 32 stations in the high-frequency section do not show clear amplifying effect except one or two stations, while in the low-frequency section, there is difference among the stations. The logarithmic value of seismic moment and the magnitude M_L of 19 seismic events has a very good linear relationship.
引文
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ChinByau-Heng,AkiK.1991.Simultaneousdeterminationofsource,path,andrecordingsiteeffectsonstronggroundmotionduringtheLomaPrietaearthquake—apreliminaryresultonpervasivenon-linearsiteeffect[J].BullSeismSocAmer,81(5):1859~1884
ChaelEP.1987.SpectralscalingofearthquakesintheMiramichiregionofNewBrunswick[J].BullSeismSocAmer,77(2):347~365
HartzellS,LeedsA,FrankelA,etal.1996.SiteresponseforurbanLosAngelesusingaftershockoftheNoerthridgeearthquake[J].BullSeismSocAmer,86(Supp.1):PartB:S168~S192
MalagniniL,HerrmannRB,BonaMD.2000a.Ground-motionscalingintheApennines(Italy)[J].BullSeismSocAmer,90(4):1062~1081
MalagniniL,HerrmannRB,KochK.2000b.Regionalground-motionscalingincentralEurope[J].BullSeismSocAmer,90(4):1052~1061
MoyaCA,AguirreJ,IrikuraK.2000.Inversionofsourceparametersandsiteeffectsfromstronggroundmotionrecordsusinggeneticalgorithms[J].BullSeismSocAmer,90(4):977~992
SinghSK,OrdazM,DattarayamRS,etal.1999.Aspectralanalysisof21May1997,Jabalpur,India,Earthquake(MW=5.8)andestimationofgroundmotionfromfutureearthquakesintheIndianshieldregion[J].BullSeismSocAmer,89(6):1620~1630
范福田.1988.大地构造轮廓和新构造运动[A].见:国家地震局《鄂尔多斯周缘活动断裂系》课题组编.鄂尔多斯周缘活动断裂系[C].北京:地震出版社,5~19
黄玉龙,郑斯华,刘杰,等.2003.华南地区地震波衰减和场地响应的研究[J].地球物理学报,46(1):54~61
刘杰,郑斯华,黄玉龙.2003.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,25(2):211~218
刘红桂,缪发军,吴晶.2004.场地响应、震源参数与介质衰减的同时反演[J].地震,24(4):27~36
AndrewsDJ.1986.Objectivedeterminationofsourceparametersandsimilarityofearthquakesofdifferentsize[J].Geo-physicalMonographs,37(6):259~267
AtkinsonGM,MereuRF.1992.TheshapeofgroundmotionattenuationcurvesinsoutheasternCanada[J].BullSeismSocAmer,82(5):2014~2031
AtkinsonGM,BooreD.1995.NewgroundmotionrelationforeasternNorthAmerica[J].BullSeismSocAmer,85(1):17~30
BruneJN.1970.Tectonicstressandthespectraofseismicshearwavesfromearthquake[J].JGeophysRes,75:4997~5009
BurgerR,SomervilleP,BarkerJ,etal.1987.Theeffectofcrustalstructureonstronggroundmotionattenuationrela-tionsineasternNorthAmerica[J].BullSeismSocAmer,77:420~439
CastroRR,MunguiaL.1993.AttenuationofPandSwavesinOaxaca,Mexicosubductionzone[J].PhysEarthPlanetInter,76(2):179~187
ChinByau-Heng,AkiK.1991.Simultaneousdeterminationofsource,path,andrecordingsiteeffectsonstronggroundmotionduringtheLomaPrietaearthquake—apreliminaryresultonpervasivenon-linearsiteeffect[J].BullSeismSocAmer,81(5):1859~1884
ChaelEP.1987.SpectralscalingofearthquakesintheMiramichiregionofNewBrunswick[J].BullSeismSocAmer,77(2):347~365
HartzellS,LeedsA,FrankelA,etal.1996.SiteresponseforurbanLosAngelesusingaftershockoftheNoerthridgeearthquake[J].BullSeismSocAmer,86(Supp.1):PartB:S168~S192
MalagniniL,HerrmannRB,BonaMD.2000a.Ground-motionscalingintheApennines(Italy)[J].BullSeismSocAmer,90(4):1062~1081
MalagniniL,HerrmannRB,KochK.2000b.Regionalground-motionscalingincentralEurope[J].BullSeismSocAmer,90(4):1052~1061
MoyaCA,AguirreJ,IrikuraK.2000.Inversionofsourceparametersandsiteeffectsfromstronggroundmotionrecordsusinggeneticalgorithms[J].BullSeismSocAmer,90(4):977~992
SinghSK,OrdazM,DattarayamRS,etal.1999.Aspectralanalysisof21May1997,Jabalpur,India,Earthquake(MW=5.8)andestimationofgroundmotionfromfutureearthquakesintheIndianshieldregion[J].BullSeismSocAmer,89(6):1620~1630
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