中国大陆及海域Love波层析成像
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摘要
收集了研究区域 ( 68°— 1 5 0°E ,5°— 5 5°N)内 33个数字地震台站记录的面波资料 ,利用多重滤波技术提取了 40 0 0余条路径上的Love波群速度频散曲线 .将研究区域划分成1°× 1°网格 ,采取Occam反演方法得到了 7.3— 1 84s共 43个周期的Love波群速度分布图 ;然后对网格结点进行S波速度结构反演 ,得出研究区域内 42 0km深度内的地壳上地幔三维速度结构 .并采用Checkerboard方法对分辨率进行检验 ,得到横向的分辨率约为 3°— 5° .研究结果表明 :中国大陆地壳上地幔结构的横向不均匀性非常明显 ,内部结构与地表特征的相关性可以达到 1 0 0— 1 5 0km深度 .大陆地区东西分带、南北分块 ,块体的边界反映比较清晰 .
We assembled the surface wave data recorded by 33 digital seismic stations in China and vicinal areas, and extracted group velocity dispersion curves of fundamental-mode Love wave along approximately 4000 paths by means of multiple-filter techniques. The study area was divided into a grid of 1°×1°, and 43 group velocity distribution maps were obtained between 7.3sec and 184sec by means of Occam inversion, afterwards the shear wave velocity structures were inverted for each node. The lateral resolution is about 3°-5° which is tested with checkerboard method. The results show that: the difference of the crust and upper mantle structure in the study area is very significant, the correlation of the interior structure and surface character is down to 100-150km. China continent can be divided into several different blocks, and the block boundary is comparatively clear.
We assembled the surface wave data recorded by 33 digital seismic stations in China and vicinal areas, and extracted group velocity dispersion curves of fundamental-mode Love wave along approximately 4000 paths by means of multiple-filter techniques. The study area was divided into a grid of 1°×1°, and 43 group velocity distribution maps were obtained between 7.3sec and 184sec by means of Occam inversion, afterwards the shear wave velocity structures were inverted for each node. The lateral resolution is about 3°-5° which is tested with checkerboard method. The results show that: the difference of the crust and upper mantle structure in the study area is very significant, the correlation of the interior structure and surface character is down to 100-150km. China continent can be divided into several different blocks, and the block boundary is comparatively clear.
引文
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[8] 徐果明,李光品,王善恩等.用瑞利面波资料反演中国大陆东部地壳上地幔横波速度的三维构造.地球物理学报,2000,43(3):366—376. XUGuoMing,LIGuangPin,WANGShanEnetal.InversionofRayleighwavedatafor3 dimensionalS waveofcrustanduppermantleineasternChina.ChineseJ.Geophys.,2000,43(3):366—376.
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[10] 曹小林,朱介寿,赵连峰等.南海及邻区地壳上地幔三维S波速度结构的面波波形反演.地震学报,2001,23(2):113—124. CAOXiaoLin,ZHUJieShou,ZHAOLianFengetal.ThreedimensionalshearwavevelocitystructureofcrustanduppermantleinSouthChinaSeaanditsadjacentregionsbysurfacewaveforminversion.ActaSeismologicaSinica,2001,23(2):113—124.
[11] 郑月军,黄忠贤,刘福田等.中国东部海域地壳—上地幔瑞利波速度结构研究.地球物理学报,2000,43(3):480—487. ZHENGYueJun,HUANGZhongXian,LIUFuTianetal.RayleighwavevelocityandstructureofthecrustanduppermantlebeneaththeseasineasternChina.ChineseJ.Geophys.,2000,43(3):480—487.
[12] 朱良保,许庆,陈晓非.保角变换在区域面波群速度反演中的应用.地球物理学报,2001.44(1):64—71. ZHULiangBao,XUQing,CHENXiaoFei.Applicationofconformalmappinginregionalsurfacewavegroupvelocityinversion.ChineseJ .Geophys.,2001.,44(1):64—71.
[13] 刘红谊,刘福田,孙若昧等.中国大陆东部及海域地壳上地幔结构研究,地震学报,2001,23(5):471—479. LIHongYi,LIUFuTian,SUNRuoMeietal.AstudyonthecrustanduppermantlestructureineastChinaandseaareas.ActaSeismologicaSinica,2001,23(5):471—479.
[14] 苏伟,彭艳菊,郑月军等.青藏高原及其邻区地壳上地幔S波速度结构.地球学报,2002,23(3):193—200. SUWei,PENGYanJu,ZHENGYueJunetal.CrustanduppermantleshearwavevelocitystructurebeneaththeTibetanPlateauandadjacentareas.ActaGeoscientiaSinica,2002,23(3):193—200.
[15] WuF .T .LevshinA .L .andKozhevnikovV .M .RayleighwavegroupvelocitytomographyofSiberia,Chinaandthevicinity.PureAppl.Geophys.1997,149:447—473.
[16] TrampertJ,andWoodhouseJH .GlobalphasevelocitymapsofLoveandRayleighwavesbetween40and150seconds.Geophys.J.Int.1998:122,675—690.
[17] RitzwollerM .H .,LevshinAL .Eurasiansurfacewavetomography:GroupVelocities.J.Geophys.Res.,1998,103(B3):4839—4878.
[18] RitzwollerM .H .,LevshinAL .,RatnikovaL .I.etal.Intermediate periodgroup velocitymapsacrossCentralAsia,west
[2] 宋仲和,谭承业.用瑞雷和乐夫面波群速度确定我国地壳厚度.地球物理学报,1965,14(1):33—44. SONGZhongHe,TANChengYe.CrustalthicknessinChinabyRayleighandLovewavegroupvelocitydata.ChineseJ .Geophys.(ActaGeophysicaSinica),1965,14(1):33—44.
[3] 冯锐,朱介寿,丁韫玉.利用地震面波研究中国地壳结构.地震学报,1981,3(3):158—167. FENGRui,ZHUJieShou,DINGWenYu.AstudyonthecrustalstructureofChinawithsurfacewaves.ActaSeismologicaSinica,1981,3(3):158—167.
[4] 宋仲和,陈国英,安昌强等.中国大陆及邻区海域瑞利波群速度分布特征.地震学报,1993,15(1):32—38. SONGZhongHe,CHENGuoYing,ANChangQiangetal.RayleighwavegroupvelocitydistributioninChinaandadjacentseaareas.ActaSeismologicaSinica,1993,15(1):32—38.
[5] 宋仲和,陈国英,安昌强等.中国大陆及邻区海域地壳-上地幔三维速度结构,中国科学(B辑),1993,23(2):180—188. SONGZhongHe,CHENGuoYing,ANChangQiangetal.Three dimensionalstructureofcrustanduppermantleinChinaanditsadjacentseas.ScienceinChina(SeriesB),1993,23(2):180—188.
[6] 陈国英,曾融生等.青藏高原瑞利波相速度与深部结构的横向变化.地震学报,1992,14(增刊):565—572. CHENGuoYing,ZENGRongShengetal.ThephasevelocitiesofRayleighwaveandthelateralvariationoflithosphericstructureintheTibetanPlateau.ActaSeismologicaSinica,1992,14(Suppl):565—572.
[7] 朱介寿,曹家敏,李显贵等.中国及邻区地球三维及结构初始模型的建立.地球物理学报,1997,40(5):627—648. ZHUJieShou,CAOJiaMin,LIXianGuietal.Thereconstructionofpreliminarythree dimensionalearth’smodelanditsimplicationsinChinaandadjacentregions.ChineseJ.Geophys.(ActaGeophysicaSinica),1997,40(5):627—648.
[8] 徐果明,李光品,王善恩等.用瑞利面波资料反演中国大陆东部地壳上地幔横波速度的三维构造.地球物理学报,2000,43(3):366—376. XUGuoMing,LIGuangPin,WANGShanEnetal.InversionofRayleighwavedatafor3 dimensionalS waveofcrustanduppermantleineasternChina.ChineseJ.Geophys.,2000,43(3):366—376.
[9] 曹小林,张雪梅,朱介寿.中国及邻区的地震面波频散反演.成都理工学院学报,1999,26(5):295—298. CAOXiaoLin,ZHANGXueMei,ZHUJieShou.SurfacewavedispersioninversioninChinaandAdjacentregions.J .ChengduUniversityofTechnology,1999,26(5):295—298.
[10] 曹小林,朱介寿,赵连峰等.南海及邻区地壳上地幔三维S波速度结构的面波波形反演.地震学报,2001,23(2):113—124. CAOXiaoLin,ZHUJieShou,ZHAOLianFengetal.ThreedimensionalshearwavevelocitystructureofcrustanduppermantleinSouthChinaSeaanditsadjacentregionsbysurfacewaveforminversion.ActaSeismologicaSinica,2001,23(2):113—124.
[11] 郑月军,黄忠贤,刘福田等.中国东部海域地壳—上地幔瑞利波速度结构研究.地球物理学报,2000,43(3):480—487. ZHENGYueJun,HUANGZhongXian,LIUFuTianetal.RayleighwavevelocityandstructureofthecrustanduppermantlebeneaththeseasineasternChina.ChineseJ.Geophys.,2000,43(3):480—487.
[12] 朱良保,许庆,陈晓非.保角变换在区域面波群速度反演中的应用.地球物理学报,2001.44(1):64—71. ZHULiangBao,XUQing,CHENXiaoFei.Applicationofconformalmappinginregionalsurfacewavegroupvelocityinversion.ChineseJ .Geophys.,2001.,44(1):64—71.
[13] 刘红谊,刘福田,孙若昧等.中国大陆东部及海域地壳上地幔结构研究,地震学报,2001,23(5):471—479. LIHongYi,LIUFuTian,SUNRuoMeietal.AstudyonthecrustanduppermantlestructureineastChinaandseaareas.ActaSeismologicaSinica,2001,23(5):471—479.
[14] 苏伟,彭艳菊,郑月军等.青藏高原及其邻区地壳上地幔S波速度结构.地球学报,2002,23(3):193—200. SUWei,PENGYanJu,ZHENGYueJunetal.CrustanduppermantleshearwavevelocitystructurebeneaththeTibetanPlateauandadjacentareas.ActaGeoscientiaSinica,2002,23(3):193—200.
[15] WuF .T .LevshinA .L .andKozhevnikovV .M .RayleighwavegroupvelocitytomographyofSiberia,Chinaandthevicinity.PureAppl.Geophys.1997,149:447—473.
[16] TrampertJ,andWoodhouseJH .GlobalphasevelocitymapsofLoveandRayleighwavesbetween40and150seconds.Geophys.J.Int.1998:122,675—690.
[17] RitzwollerM .H .,LevshinAL .Eurasiansurfacewavetomography:GroupVelocities.J.Geophys.Res.,1998,103(B3):4839—4878.
[18] RitzwollerM .H .,LevshinAL .,RatnikovaL .I.etal.Intermediate periodgroup velocitymapsacrossCentralAsia,west
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