渤海湾盆地北西盆山边界地区泊松比分布
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摘要
泊松比做为了解地球内部介质一个非常重要的参数,在地震学上可以通过P波和S波速度的比值来确定.利用远震P波波形记录中包含的壳-幔速度间断面的Ps转换波及其多次反射转换波信息,采用在地壳厚度-波速比平面上对接收函数转换波能量的叠加搜索方法,可以测定台站下方区域内地壳的平均厚度和泊松比.我们对渤海湾盆地北西盆山边界地区68个宽频带台站近两年的远震记录资料进行了处理研究,得到了该区域的地壳厚度以及泊松比分布.结果表明,渤海湾盆地北西盆山边界的泊松比值分布横向变化复杂,山区侧与盆地侧存在明显差异;山区侧泊松比值分布相对均匀,盆地侧变化剧烈,但存在小区域范围内(100～200km)的一致性,与地表出露岩石的对比表明:形成渤海湾盆地的新生代伸展作用在下地壳深度有明显的响应,从地震学上获得的泊松比分布对于了解该地区地壳物质组成可起到很好的约束作用.
The Poisson's ratio, an important parameter to understand the interior of the earth, can be dertermined from the ratio of P_ to S_ seismic wave velocity. Teleseismic P waveform contains much information about the Ps converted wave and its multiples from discontinuities in the crust and the mantle, which can be used to acquire the average thickness and the Poisson's ratio of the crust by the H_k stacking method. Data from 68 broadband seismic stations located in the northwestern basin_mountain boundary of the Bohai Bay Basin are processed, and the distributions of the average crustal thickness and Poisson's ratios are determined. We find that there is a distinct differentiation of Poisson's ratios in the study area. The distribution of Poisson's ratios on the flank of the mountain is rather uniform, while on the flank of the basin much variable. The comparison between Poisson's ratios and the surface geology manifests that there is an apparent response in the lower crust to the intense extension of the Bohai Bay Basin during Cenozoic. The Poisson's ratios deduced from seismology can be used to constrain the compostion of the crust in the study area.
The Poisson's ratio, an important parameter to understand the interior of the earth, can be dertermined from the ratio of P_ to S_ seismic wave velocity. Teleseismic P waveform contains much information about the Ps converted wave and its multiples from discontinuities in the crust and the mantle, which can be used to acquire the average thickness and the Poisson's ratio of the crust by the H_k stacking method. Data from 68 broadband seismic stations located in the northwestern basin_mountain boundary of the Bohai Bay Basin are processed, and the distributions of the average crustal thickness and Poisson's ratios are determined. We find that there is a distinct differentiation of Poisson's ratios in the study area. The distribution of Poisson's ratios on the flank of the mountain is rather uniform, while on the flank of the basin much variable. The comparison between Poisson's ratios and the surface geology manifests that there is an apparent response in the lower crust to the intense extension of the Bohai Bay Basin during Cenozoic. The Poisson's ratios deduced from seismology can be used to constrain the compostion of the crust in the study area.
引文
[1]ChristensenNI.Poisson’sratioandcrustalseismology.JGeophys Res,1996,101(B2):3139～3156
[2]ZandtG,AmmonCJ.Continentalcrustcompostionconstrainedby measurementsofcrustalPoisson’sratio.Nature,1995,374:152～154
[3]OwensTJ,ZandtG.Implicationsofcrustalpropertyvariationsfor modelsofTibetanplateauevolution.Nature,1997,387:37～43
[4]ChevrotS,RobertD,HilstV.Thepoisson’sratiooftheAustralian crust:geologicalandgeophysicalimplications.EarthPlanet.Sci.Lett.,2000,183:121～132
[5]ZhuLP,KanamoriH.MohodepthvariationinsouthernCalifornia fromteleseismicreceiverfunctions.JGeophysRes,2000,105(B2):2969～2980
[6]刘启元,KindR,李顺成.接收函数复频谱比的最大或然性估计及非线性反演.地球物理学报,1996,39(4):502～513LiuQY,KindR,LiSC.Maximallikelihoodestimationand nonlinearinversionofthecomplexreceiverfunctionspectrumratio.ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1996,39(4):502～513
[7]刘启元,李顺成,沈杨等.延怀盆地及其邻区地壳上地幔速度结构的宽频带地震台阵研究.地球物理学报,1997,40(6):763～771LiuQY,LiSC,ShenY,etal.Broadbandseismicarraystudyof thecrustanduppermantlevelocitystructurebeneathYanhuaibasinanditsneighbouringregion(inChinese).ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1997,40(6):763～771
[8]吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构.地球物理学报,1998,41(5):669～679WuQJ,ZengRS.ThecrustalstructureofQinghai_Xizangplateau inferredfrombroadbandteleseismicwaveform.ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1998,41(5):669～679
[9]徐锡伟,吴卫民,张先康等.首都圈地区地壳最新构造变动与地震.北京:科学出版社,2002XuXW,WuWM,ZhangXK,etal.TheNewestTectonicsand EarthquakeinCapitalArea.Beijing:SciencePress,2002
[10]樊祺诚,刘若新,李惠民等.汉诺坝捕虏体麻粒岩锆石年代学与稀土元素地球化学.科学通报.1998,43(2):133～137FanQC,LiuRX,LiHM,etal.ZirconchronologyandREE geochemistryofgranulitexenolithatHannuoba.ChineseScience Bulletin(inChinses),1998,43(2):133～137
[11]罗镇宽,苗来成,关康等.冀东都山花岗岩基及相关花岗斑岩脉SHRIMP锆石U-Pb法定年及其意义.地球化学,2003,32(2):173～180LuoZK,MiaoLC,GuanK,etal.SHRIMPU_Pbzircondatingof theDushangraniticbatholithandrelatedgranite_porphyrydyke,easternHebeiProvince,China,andtheirgeologicalsignificance.Geochemistry(inChinese),2003,32(2):173～180
[12]高山,MihaiNDucea,金振民等.下地壳拆沉作用及大陆地壳演化.高校地质学报,1998,4(3):241～249GaoS,MihaiNDucea,JinZM,etal.Lowercrustaldelaminationand evolutionofcontinentalcrust.GeologicalJournalofChina Universities(inChinese),1998,4(3):241～249
[13]雷世和,胡胜军,赵占元等.河北阜平、赞皇变质核杂岩构造及成因模式.河北地质学院学报,1994,17(1):54～64LeiSH,HuSJ,ZhaoZY,etal.ModelsforFuping_Zanhuang metamorphicbicorecomplexesstructure,Hebei,China.Journalof HebeiCollegeofGeology(inChinese),1994,17(1):54～64
[14]DavisGA,郑亚东.变质核杂岩的定义、类型及构造背景.地质通报,2002,21(4-5):185～192DavisGA,ZhengYD.Metamorphiccorecomplexes:Definition,typesandtectonicsetting.GeologicalBulletinofChina(inChinese),2002,21(4-5):185～192
[2]ZandtG,AmmonCJ.Continentalcrustcompostionconstrainedby measurementsofcrustalPoisson’sratio.Nature,1995,374:152～154
[3]OwensTJ,ZandtG.Implicationsofcrustalpropertyvariationsfor modelsofTibetanplateauevolution.Nature,1997,387:37～43
[4]ChevrotS,RobertD,HilstV.Thepoisson’sratiooftheAustralian crust:geologicalandgeophysicalimplications.EarthPlanet.Sci.Lett.,2000,183:121～132
[5]ZhuLP,KanamoriH.MohodepthvariationinsouthernCalifornia fromteleseismicreceiverfunctions.JGeophysRes,2000,105(B2):2969～2980
[6]刘启元,KindR,李顺成.接收函数复频谱比的最大或然性估计及非线性反演.地球物理学报,1996,39(4):502～513LiuQY,KindR,LiSC.Maximallikelihoodestimationand nonlinearinversionofthecomplexreceiverfunctionspectrumratio.ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1996,39(4):502～513
[7]刘启元,李顺成,沈杨等.延怀盆地及其邻区地壳上地幔速度结构的宽频带地震台阵研究.地球物理学报,1997,40(6):763～771LiuQY,LiSC,ShenY,etal.Broadbandseismicarraystudyof thecrustanduppermantlevelocitystructurebeneathYanhuaibasinanditsneighbouringregion(inChinese).ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1997,40(6):763～771
[8]吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构.地球物理学报,1998,41(5):669～679WuQJ,ZengRS.ThecrustalstructureofQinghai_Xizangplateau inferredfrombroadbandteleseismicwaveform.ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1998,41(5):669～679
[9]徐锡伟,吴卫民,张先康等.首都圈地区地壳最新构造变动与地震.北京:科学出版社,2002XuXW,WuWM,ZhangXK,etal.TheNewestTectonicsand EarthquakeinCapitalArea.Beijing:SciencePress,2002
[10]樊祺诚,刘若新,李惠民等.汉诺坝捕虏体麻粒岩锆石年代学与稀土元素地球化学.科学通报.1998,43(2):133～137FanQC,LiuRX,LiHM,etal.ZirconchronologyandREE geochemistryofgranulitexenolithatHannuoba.ChineseScience Bulletin(inChinses),1998,43(2):133～137
[11]罗镇宽,苗来成,关康等.冀东都山花岗岩基及相关花岗斑岩脉SHRIMP锆石U-Pb法定年及其意义.地球化学,2003,32(2):173～180LuoZK,MiaoLC,GuanK,etal.SHRIMPU_Pbzircondatingof theDushangraniticbatholithandrelatedgranite_porphyrydyke,easternHebeiProvince,China,andtheirgeologicalsignificance.Geochemistry(inChinese),2003,32(2):173～180
[12]高山,MihaiNDucea,金振民等.下地壳拆沉作用及大陆地壳演化.高校地质学报,1998,4(3):241～249GaoS,MihaiNDucea,JinZM,etal.Lowercrustaldelaminationand evolutionofcontinentalcrust.GeologicalJournalofChina Universities(inChinese),1998,4(3):241～249
[13]雷世和,胡胜军,赵占元等.河北阜平、赞皇变质核杂岩构造及成因模式.河北地质学院学报,1994,17(1):54～64LeiSH,HuSJ,ZhaoZY,etal.ModelsforFuping_Zanhuang metamorphicbicorecomplexesstructure,Hebei,China.Journalof HebeiCollegeofGeology(inChinese),1994,17(1):54～64
[14]DavisGA,郑亚东.变质核杂岩的定义、类型及构造背景.地质通报,2002,21(4-5):185～192DavisGA,ZhengYD.Metamorphiccorecomplexes:Definition,typesandtectonicsetting.GeologicalBulletinofChina(inChinese),2002,21(4-5):185～192
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