Lg尾波Q_0值与中国大陆及邻区的地质构造关系
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摘要
利用中国大陆45个宽频带数字地震台站的432条垂直向地震记录,采用叠加频谱比值法计算单台Lg尾波Q0(1Hz的Q值)及η值.利用层析成像方法反演得到中国大陆及邻区(70°~135°E,20°~50°N)Lg尾波Q0及η值的横向变化图象.结果表明,中国大陆及邻区Q0值主要在150~600之间.其中川滇及缅甸西北部地区的Q0值最低(<240).该地区地壳有复杂的断裂破碎构造及强烈的水热活动.最高Q0值(Q0>510)区主要位于蒙古高原南部、阿拉善、鄂尔多斯块体交界.其频率依赖η值在0.45~0.75之间变化.
We have collected 432 vertical component records from 45 stations of new CENC (China Earthquake Network Center) in Chinese mainland and adjacent regions. These records were used to calculate Q_0(Q at 1 Hz) and η values of Lg coda from each station by the stack spectral ratio method. Then the tomography method was applied to obtaining lateral variation of Q_0 and η values in Chinese mainland and adjacent regions. The result indicates that Q_0 value varies between 150 and 600 in the studied areas. Yunnan, southwest Sichuan, and northwest Myanmar show the lowest Q_0 value(Q_0<240) and the crust of these regions is characterized by complicated crack and strong hydrothermal activity. The highest Q_0 value (Q_0>510) exists in the border of southern Mongolia, Alxa and Ordos block. The η value varies between 0.45 and 0.75 in Chinese mainland and its adjacent regions.
We have collected 432 vertical component records from 45 stations of new CENC (China Earthquake Network Center) in Chinese mainland and adjacent regions. These records were used to calculate Q_0(Q at 1 Hz) and η values of Lg coda from each station by the stack spectral ratio method. Then the tomography method was applied to obtaining lateral variation of Q_0 and η values in Chinese mainland and adjacent regions. The result indicates that Q_0 value varies between 150 and 600 in the studied areas. Yunnan, southwest Sichuan, and northwest Myanmar show the lowest Q_0 value(Q_0<240) and the crust of these regions is characterized by complicated crack and strong hydrothermal activity. The highest Q_0 value (Q_0>510) exists in the border of southern Mongolia, Alxa and Ordos block. The η value varies between 0.45 and 0.75 in Chinese mainland and its adjacent regions.
引文
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SatoH.1977.Energypropagationincludingscatteringeffects;singleisotropicscatteringapproximation[J].JPhysEarth,25:27~41
SouzaJ,MitchellBJ.1998.LgcodaQvariationacrossSouthAmericaandtheirrelationtocrustalstructureandevolu-tion[J].PureApplGeophys,153:587~612
XieJ,NuttliOW.1988.Interpretationofhigh-frequencycodaatlargedistances:stochasticmodelingandmethodofin-version[J].GeophysJ,95:579~595
XieJ,MitchellBJ.1990.Aback-projectionmethodforimaginglarge-scalelateralvariationsofLgcodaQwithapplica-tiontocontinentalAfrica[J].GeophysJInt,100:161~181
胡家富,丛连理,苏有锦,等.2003.云南及周边地区Lg尾波Q值的分布特征[J].地球物理学报,46(5):800~813
胡圣标,何丽娟,汪集.2001.中国大陆地区大地热流数据汇编(第三版)[J].地球物理学报,44(5):611~626
皇甫岗,姜朝松.2000.腾冲火山研究[M].昆明:云南科技出版社,334~380
刘建华,刘福田,王凤霞,等.1999.单台Lg尾波QcLg的测量研究[J].地球物理学报,42(3):371~382
刘建华,刘福田,何建坤,等.2000.攀西古裂谷的地震成像研究壳幔构造特征及其演化推断[J].中国科学,D辑,30(增刊):9~15
任纪舜,姜春发,张正坤,等.1981.中国大地构造演化[A].见:黄汲清,李春昱主编.中国及邻区大地构造论文集[C].北京:地质出版社,138~147
苏伟,彭艳菊,郑月军,等.2002.青藏高原及其邻区地壳上地幔S波速度结构[J].地球学报,23(3):193~200
曾健,陈天长,韩渭宾,等.1997.成都遥测台网区域尾波衰减特性及Qc值研究[J].地震学报,19(3):246~253
AkiK.1969.Analysisoftheseismiccodaoflocalearthquakesasscatteredwaves[J].JGeophysRes,74:615~631
AkiK,ChouetB.1975.Originofcodawaves:source,attenuation,andscatteringeffects[J].JGeophysRes,80:3322~3342
BaqerSA,MitchellBJ.1998.RegionalvariationofLgcodaQinthecontinentalUnitedStatesanditrelationtocrustalstructureandevolution[J].PureApplGeophys,153:613~638
CongL,MitchellBJ.1998.LgcodaQanditsrelationtothegeologyandtectonicsoftheMiddleEast[J].PureApplGeophys,153:563~585
MitchellBJ,BagerS,AkinciA,etal.1998.LgcodaQinaustraliaanditsrelationtocrustalstructureandevolution[J].PureApplGeophys,153:639~657
MitchellBJ,PanY,XieJ,etal.1997.LgcodaQvariationacrossEurasiaanditsrelationtoevolution[J].JGeophysRes,102:22767~22779
SatoH.1977.Energypropagationincludingscatteringeffects;singleisotropicscatteringapproximation[J].JPhysEarth,25:27~41
SouzaJ,MitchellBJ.1998.LgcodaQvariationacrossSouthAmericaandtheirrelationtocrustalstructureandevolu-tion[J].PureApplGeophys,153:587~612
XieJ,NuttliOW.1988.Interpretationofhigh-frequencycodaatlargedistances:stochasticmodelingandmethodofin-version[J].GeophysJ,95:579~595
XieJ,MitchellBJ.1990.Aback-projectionmethodforimaginglarge-scalelateralvariationsofLgcodaQwithapplica-tiontocontinentalAfrica[J].GeophysJInt,100:161~181
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