中国东南大陆及陆缘地带的瑞利波频散与剪切波三维速度结构
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摘要
利用我国地震台站记录的瑞利波观测资料 ,通过适配滤波频时分析技术进行数据处理 ,获得了穿越我国东南及陆缘地区的瑞利波频散 .使用随机反演理论取得了东南大陆及陆缘地带 4°× 4°网格的纯路径频散数据 .在网格反演的基础上使用Harkrider的面波反演程序求得了该区剪切波的三维速度结构 .结果表明 :1 .华南大陆Moho界面埋深为 3 0— 40km ,并由西向东逐渐减薄 ,在陆缘与浅海地域为 2 5— 2 8km ,具有明显的分区特征 .2 .上地幔低速层埋深为 6 0— 1 5 0km ,变化幅度较大 ,这与深部断裂分布及深层过程有关 ,但NS向剖面上各界面的起伏变化均比EW向剖面平缓 .3 .东南陆缘是东亚大陆的海陆过渡带 ,在深部表现为Moho界面埋深和地壳平均速度降低的地带 ,地幔深部界面的起伏形态充分表明 ,深浅介质结构和物质耦合的不均匀性 .
HTWTIn this study,the dispersion of Rayleigh waves crossing Southeast China and its continental margin is determined by applying the (Matched-filter frequency-time analysis) technique to CDSN mid-long period data. The technique improves the resolution of dispersion measurement over a broader period range with reduced systematic errors. An improved grid dispersion inversion is proposed to extract pure-path dispersion curves in 4°×4° grid from the mixed path dispersion data. On the basis of the grid dispersion inversion,we use Harkrider surfer Wave inversion program to study the three dimension shear wave velocity structure to depth of 200km. A detailed description on the lateral heterogeneity in the crust and upper mantle of Southeast China is provided. The results show that:1. The depth of Moho is generally 30_40km in continent region of Southeast China and 25_28km in its continental margin. The crustal thickness is thin from west,and the features of regional division are quite clear. 2. The depth of the low velocity layer in the upper mantle is 60_150km in continent of southeast China. Distribution of deep faults and deep internal processes has something to do with the great variational amplitude for the lower velocity layer in the upper mantle. 3. The Southeast margin of China is a transition belt between continent and Sea. Its characteristics are shown that there is a low velocity zone and the depth of the Moho is shallow. The undulate shape of deep interface of the mantle makes clear,moreover,its cupping between deep and shallow and structure is inhomogeneity. WTHZHTH
HTWTIn this study,the dispersion of Rayleigh waves crossing Southeast China and its continental margin is determined by applying the (Matched-filter frequency-time analysis) technique to CDSN mid-long period data. The technique improves the resolution of dispersion measurement over a broader period range with reduced systematic errors. An improved grid dispersion inversion is proposed to extract pure-path dispersion curves in 4°×4° grid from the mixed path dispersion data. On the basis of the grid dispersion inversion,we use Harkrider surfer Wave inversion program to study the three dimension shear wave velocity structure to depth of 200km. A detailed description on the lateral heterogeneity in the crust and upper mantle of Southeast China is provided. The results show that:1. The depth of Moho is generally 30_40km in continent region of Southeast China and 25_28km in its continental margin. The crustal thickness is thin from west,and the features of regional division are quite clear. 2. The depth of the low velocity layer in the upper mantle is 60_150km in continent of southeast China. Distribution of deep faults and deep internal processes has something to do with the great variational amplitude for the lower velocity layer in the upper mantle. 3. The Southeast margin of China is a transition belt between continent and Sea. Its characteristics are shown that there is a low velocity zone and the depth of the Moho is shallow. The undulate shape of deep interface of the mantle makes clear,moreover,its cupping between deep and shallow and structure is inhomogeneity. WTHZHTH
引文
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[17] 胡家富,滕吉文,庄 真.频时分析与网格频散反演技术.见:云南地球物理文集.昆明:云南大学出版社,1992.125—131.HUJiaFu,TENGJiWen,ZHUANGZhen.Thetechniquesofmatched filterfrequency timeanalysisandgriddispersioninver sion.In:YunnanGeophysicalCollectionWorks,(inChinese).Kunming:YunnanUniversityPublishingHouse,1992.125—131.
[18] DziewonskiAM ,MillsJ,BlockS .ResidualdispersionmeasurementAnewmethodofsurfacewaveanalysis,Bull.Seism.Soc.Am.,1972,62:129—139.
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[20] FengCC ,TengTL .Anerroranalysisoffrequency timeanalysis.Bull.Seism.Soc.Am.1983.73:143—155.
[21] DziewonskiA ,BlockS,andLandismanM ,Atechniquefortheanalysisoftransientseismicsignals.BullSeism.Soc.Am.,1969,59:427—444.
[22] 滕吉文,吴 华,王爱武,等.中国东南陆缘地带岩石圈结构和动力学.中国科学,1994,24(8):866—875.TENGJiWen,WUHua,WANGAiWu,etal.ThelithospherestructureandgeodynamicincontinentalmarginofsoutheastChina.ScienceinChina(inChinese),1994,24(8):866—875.
[23] 刘建华,吴 华,刘福田.华南及其海域三维速度分布特征与岩石层结构.地球物理学报,1996,39(4):483—492.LIUJianHua,WUHua,LIUFuTian.Featuresof3DvelocitydistributionandLithospherestructureinSouthChinaanditscontiguousSeaarea.ChineseJGeophys.,1996,39(4):483—492.
[24] 尹周勋,刘宏宾,熊绍柏等.华南连县-博罗-港口地带地壳结构及速度分布爆炸地震探测结果.地球物理学报,1999,42(3):383—392.YINZhouXun,LIUHongBin,XIONGShaoBaietal.CrustalstructureandvelocitydistributionfromdeepseismicsoundingalongtheprofileofLianxianBoluoGangkouinSouthChina.ChineseJGeophys.,1999,42(3):383—392.
[25] 刘光鼎.中国海地球物理场和地球动力学特征.地质学报,1992,66(4):303—312.LIUGuangDing,FeaturesofgeophysicalfieldsandgeodynamicsoftheseaareasofChina.ActaGeologicaSinca(inChi nese),1992,66(4):303—312.
[26] BurkthardNR ,JacksonDD .Densityandsurfacewaveinversion.Geophys.Res.Lett.,1976,3.636—638.
[2] 黄汲清,任纪舜,姜春发等.中国大地构造及其演化.北京:科学出版社,1980.HUANGJiQing,RENJiShun,JIANGChunFa,etal.TheTectonicsandEvolutionofChina(inChinese).Beijing:SciencePress,1980.
[3] 程裕淇主编.中国区域地质概论.北京:地质出版社,1998.CHENGYuQi.IntroductionofRegionalGeologyinChina(inChinese).Beijing:GeologicalPublishingHouse,1998.
[4] 陈国达.中国大地构造概要.北京:科学出版社,1977.CHENGuoDa.OutlineofTectonicinChina(inChinese).Beijing:SciencePress,1977.
[5] 马杏垣主编.中国岩石圈动力学纲要———1∶400万中国及邻近海域岩石圈动力学说明书.北京:地质出版社,1987.MAXingYuan.TheOutlineofLithosphericDynamicsofChina———ExplanationoflithosphericdynamicsinChinaanditscloseseaarea(1∶4,000,000)(inChinese).Beijing:GeologicalPublishingHouse,1987.
[6] 丁国瑜主编.中国岩石圈动力学概论.北京:地震出版社,1991.DINGGuoYu.IntroductionofLithosphericDynamicsinChina(inChinese).Beijing:SeismologicalPress,1991.
[7] 郭令智,施央申,马瑞士.华南大陆构造格架与地壳演化.见:第26届国际地质大会国际交流学术论文集(一),109—116.北京:地质出版社,1980.GUOLingZhi,SHIYangShen,MARuiShi.ThecontinentaltectonicpatternandcrustalevolutioninsoutheastChina.In:Proceedingsofthe26thIGCC(1)(inChinese),109—116.Beijing:GeologicalPublishingHouse,1980.
[8] 任纪舜,陈延愚,牛宝贵等.中国东部及邻区大陆岩石圈的构造演化与成矿.北京:科学出版社,1990.RENJiShun,CHENYanNian,NIUBaoGui,etal.TectonicofLithosphereoftheContinentalEasternChinaandAdjacentAreas(inChinese).Beijing:SciencePress,1990.
[9] 水 涛,徐步台,梁如华,等.绍兴—江山古陆对接带.科学通报,1986,31(6):444—448.SHUITao,XUBuTai,LIANGRuHua,etal.ShaoxingJiangshanPalaeocontinentalCyclopeanBelt.ChineseScienceBulletin(inChinese),1986,31(6):444—448.
[10] 李继亮主编.东南大陆岩石圈结构与地质演化.北京:冶金工业出版社,1993.LIJiLiang.TheStructureofLithosphereandGeologicalEvolutioninContinentofSoutheastChina(inChinese).Beijing:MetallurgicalIndustryPublishing,1993.
[11] 涂光炽.华南古元古宙基底演化和成矿作用.北京:科学出版社,1993.TuGuangZhi.PalaeoproterozoicFoundationEvolutionandMineralizationofSouthernChina.Beijing:SciencePress,1993.
[12] 徐克勤,朱金初,刘昌实等.华南花岗岩的成因系列和物质来源.南京大学学报(地球科学),1989,28(3):1—18.XUKeQin,ZHUJinChu,LIUChangShi,etal.GenesisseriesforgraniteofsouthernChinaanditsmaterialorigin.JournalofNanjingUniversity(EarthScience)(inChinese).1989,28(3):1—18.
[13] 魏斯禹,滕吉文,王谦身等.中国东部大陆边缘地带的岩石圈结构与动力学.北京:科学出版社,1990.WEISiYu,TENGJiWen,WANGQianShen,etal.LithosphereStructureandGeodynamicsinContinentalMarginofEasternChina(inChinese).Beijing:SciencePress,1990.
[14] 熊绍柏,赖明惠,刘宏兵等.屯溪—温州地带岩石圈结构与速度分布.见:李继亮主编,东南大陆岩石圈结构与地质演化.北京:冶金工业出版社,1993.250—256.XIONGShaoBai,LAIMingHui,LIUHongBing,etal.LithospherestructureandvelocitydistributionofTunxiWenzhoure gion,In:LIJiLianged.ThestructureoflithosphereandgeologicalevolutionincontinentofsoutheastChina(inChinese),Beijing:MetallurgicalIndustryPublishingHouse,1993.250—256.
[15] 闻昆娣,朱振宇,章林云等.中国东南陆缘地区上地幔顶部速度结构特征.见:陈运泰主编,中国固体地球物理学进展.北京:海洋出版社,1994.81—90.WENKunDi,ZHUZhenYu,ZHANGLinYun,etal.ThevelocitystructurefeaturesonthetopofuppermantleinsoutheastcontinentalmarginofChina.In:CHENYunTai,AdvancesinsolidearthgeophysicsinChina(inChinese).Beijing:OceanPublishingHouse,1994.81—90.
[16] DouglasC ,Nyman.Thedisplay equalizedfilterforfrequency timeanalysis.Bull.Seism.Soc.Am.1977,67:393—404.
[17] 胡家富,滕吉文,庄 真.频时分析与网格频散反演技术.见:云南地球物理文集.昆明:云南大学出版社,1992.125—131.HUJiaFu,TENGJiWen,ZHUANGZhen.Thetechniquesofmatched filterfrequency timeanalysisandgriddispersioninver sion.In:YunnanGeophysicalCollectionWorks,(inChinese).Kunming:YunnanUniversityPublishingHouse,1992.125—131.
[18] DziewonskiAM ,MillsJ,BlockS .ResidualdispersionmeasurementAnewmethodofsurfacewaveanalysis,Bull.Seism.Soc.Am.,1972,62:129—139.
[19] AkiK ,RichardPG .Quantitativeseismology,Theoryandmethod.SanFrancisco,W .H .FreemanandCompany,1980.675—771.
[20] FengCC ,TengTL .Anerroranalysisoffrequency timeanalysis.Bull.Seism.Soc.Am.1983.73:143—155.
[21] DziewonskiA ,BlockS,andLandismanM ,Atechniquefortheanalysisoftransientseismicsignals.BullSeism.Soc.Am.,1969,59:427—444.
[22] 滕吉文,吴 华,王爱武,等.中国东南陆缘地带岩石圈结构和动力学.中国科学,1994,24(8):866—875.TENGJiWen,WUHua,WANGAiWu,etal.ThelithospherestructureandgeodynamicincontinentalmarginofsoutheastChina.ScienceinChina(inChinese),1994,24(8):866—875.
[23] 刘建华,吴 华,刘福田.华南及其海域三维速度分布特征与岩石层结构.地球物理学报,1996,39(4):483—492.LIUJianHua,WUHua,LIUFuTian.Featuresof3DvelocitydistributionandLithospherestructureinSouthChinaanditscontiguousSeaarea.ChineseJGeophys.,1996,39(4):483—492.
[24] 尹周勋,刘宏宾,熊绍柏等.华南连县-博罗-港口地带地壳结构及速度分布爆炸地震探测结果.地球物理学报,1999,42(3):383—392.YINZhouXun,LIUHongBin,XIONGShaoBaietal.CrustalstructureandvelocitydistributionfromdeepseismicsoundingalongtheprofileofLianxianBoluoGangkouinSouthChina.ChineseJGeophys.,1999,42(3):383—392.
[25] 刘光鼎.中国海地球物理场和地球动力学特征.地质学报,1992,66(4):303—312.LIUGuangDing,FeaturesofgeophysicalfieldsandgeodynamicsoftheseaareasofChina.ActaGeologicaSinca(inChi nese),1992,66(4):303—312.
[26] BurkthardNR ,JacksonDD .Densityandsurfacewaveinversion.Geophys.Res.Lett.,1976,3.636—638.
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