利用面波波形模拟探测中国大陆地壳和上地幔波速结构的分区特征
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摘要
对穿过中国大陆东部、中部、北部和西部4个不同地区的8条地震射线路径的波形进行拟合分析,反演得到了各路径下方的一维平均波速结构.反演得到的地壳和上地幔波速结构表现出明显的分区特征,该特征与已知的大地构造单元和已有的研究成果吻合较好.表明面波波形拟合方法是一种可靠的探测地壳和上地幔波速结构的方法,且比单纯利用基阶面波频散对上地幔结构探测更具优势.
The present study firstly analyzed surface waveform fittings for 8 wave paths crossing through four different regions of the Chinese mainland(eastern,central,northern and western China),and then inverted for 1D path-averaged S-velocities for such paths.The inverted crustal and upper-mantle S-velocities showed obvious region-related features,which are well consistent with known geotectonic units and previous research results.Such analyses showed that surface waveform modeling is a reliable method to get crustal and upper-mantle velocity structure.Furthermore,this method has a prominent advantage in detecting upper-mantle structure compared with fundamental-mode surface-wave dispersion method.
The present study firstly analyzed surface waveform fittings for 8 wave paths crossing through four different regions of the Chinese mainland(eastern,central,northern and western China),and then inverted for 1D path-averaged S-velocities for such paths.The inverted crustal and upper-mantle S-velocities showed obvious region-related features,which are well consistent with known geotectonic units and previous research results.Such analyses showed that surface waveform modeling is a reliable method to get crustal and upper-mantle velocity structure.Furthermore,this method has a prominent advantage in detecting upper-mantle structure compared with fundamental-mode surface-wave dispersion method.
引文
曹小林,朱介寿,赵连锋,曹家敏,洪学海.2001.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[J].地震学报,23(2):113--124.
冯梅,安美建.2007.中国大陆中上地壳剪切波速结构[J].地震学报,29(4):337--347.
冯锐,朱介寿,丁韫玉,陈国英,何正勤,杨树彬,周海南,孙克忠.1981.利用地震面波研究中国地壳结构[J].地震学报,3(4):336--350.
何正勤,丁志峰,叶太兰,孙为国,张乃玲.2002.中国大陆及其邻域的瑞利波群速度分布图象与地壳上地幔速度结构[J].地震学报,24(3):252--259.
徐果明,李光品,王善恩,陈虹,周虎顺.2000.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结构[J].地球物理学报,43(3):366--376.
朱介寿,曹家敏,蔡学林,严忠琼,曹小林.2002.东亚及西太平洋边缘海地震高分辨率层析成像[J].地球物理学报,45(5):646--664.
Dziewonski A M,Friedman A,Giardini D,Woodhouse J H.1983.Global seismicity of1982:Centroid-moment tensorsolutions for308earthquakes[J].Phys Earth Planet Interi,33:76--90.
Engdahl E R,van der Hilst R D,Buland R.1998.Global teleseismic earthquake relocation with improved travel timesand procedures for detph determination[J].Bull Seism Soc Amer,88:722--743.
Feng M,van der Lee S,Assumpca～o M.2007.Upper mantle structure of South America fromjoint inversion of wave-forms and fundamental-mode group velocities of Rayleigh waves[J].J Geophys Res,112:B04312,doi:10.1029/2006JB004449.
Gee L S,Jordan T H.1992.Generalized seismological data functionals[J].Geophys J Int,111(2):363--390.
Huang Z,Su W,Peng Y,Zheng Y,Li H.2003.Rayleigh wave tomography of China and adjacent regions[J].J Geo-phys Res,108(B2):2073,doi:10.1029/2001JB001696.
Kennett B L N,Engdahl E R.1991.Traveltimes for global earthquake location and phase identification[J].Geophys JInt,105:429--465.
Lebedev S,Nolet G.1997.The upper mantle beneath the Philippine Sea region from waveforminversions[J].GeophysRes Lett,24(15):1051--1854.
Lebedev S,Nolet G.2003.Upper mantle beneath Southeast Asia from S velocity tomography[J].J Geophys Res,108(B1):2048.
Li S L,Mooney WD,Fan J C.2006.Crustal structure of mainland China fromdeep seismic sounding data[J].Tectono-physics,420:239--252.
Marone F,van der Meijde M,van der Lee S,Giardini D.2004.Three-dimensional upper-mantle S-velocity model for theEurasia-Africa plate boundary region[J].Geophys J Int,158:109--130.
Nolet G.1990.Partitioned waveforminversion andtwo-dimensional structure under the Network of Autonomous Record-ing Seismographs[J].J Geophys Res,95:8499--8512.
Ritzwoller M H,Levshin AL.1998.Eurasian surface wave tomography:Group velocities[J].J Geophys Res,103(B3):4839--4878.
van der Lee S,Nolet G.1997.Upper-mantle S velocity structure of North America[J].J Geophys Res,102:22815--22838.
Villasen～or A,Ritzwoller M H,Levshin AL,Barmin MP,Engdahl E R,Spakman W,Trampert J.2001.Shear velocitystructure of central Eurasia frominversion of surface wave velocities[J].Phys Earth Planet Ints,123:169--184.
冯梅,安美建.2007.中国大陆中上地壳剪切波速结构[J].地震学报,29(4):337--347.
冯锐,朱介寿,丁韫玉,陈国英,何正勤,杨树彬,周海南,孙克忠.1981.利用地震面波研究中国地壳结构[J].地震学报,3(4):336--350.
何正勤,丁志峰,叶太兰,孙为国,张乃玲.2002.中国大陆及其邻域的瑞利波群速度分布图象与地壳上地幔速度结构[J].地震学报,24(3):252--259.
徐果明,李光品,王善恩,陈虹,周虎顺.2000.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结构[J].地球物理学报,43(3):366--376.
朱介寿,曹家敏,蔡学林,严忠琼,曹小林.2002.东亚及西太平洋边缘海地震高分辨率层析成像[J].地球物理学报,45(5):646--664.
Dziewonski A M,Friedman A,Giardini D,Woodhouse J H.1983.Global seismicity of1982:Centroid-moment tensorsolutions for308earthquakes[J].Phys Earth Planet Interi,33:76--90.
Engdahl E R,van der Hilst R D,Buland R.1998.Global teleseismic earthquake relocation with improved travel timesand procedures for detph determination[J].Bull Seism Soc Amer,88:722--743.
Feng M,van der Lee S,Assumpca～o M.2007.Upper mantle structure of South America fromjoint inversion of wave-forms and fundamental-mode group velocities of Rayleigh waves[J].J Geophys Res,112:B04312,doi:10.1029/2006JB004449.
Gee L S,Jordan T H.1992.Generalized seismological data functionals[J].Geophys J Int,111(2):363--390.
Huang Z,Su W,Peng Y,Zheng Y,Li H.2003.Rayleigh wave tomography of China and adjacent regions[J].J Geo-phys Res,108(B2):2073,doi:10.1029/2001JB001696.
Kennett B L N,Engdahl E R.1991.Traveltimes for global earthquake location and phase identification[J].Geophys JInt,105:429--465.
Lebedev S,Nolet G.1997.The upper mantle beneath the Philippine Sea region from waveforminversions[J].GeophysRes Lett,24(15):1051--1854.
Lebedev S,Nolet G.2003.Upper mantle beneath Southeast Asia from S velocity tomography[J].J Geophys Res,108(B1):2048.
Li S L,Mooney WD,Fan J C.2006.Crustal structure of mainland China fromdeep seismic sounding data[J].Tectono-physics,420:239--252.
Marone F,van der Meijde M,van der Lee S,Giardini D.2004.Three-dimensional upper-mantle S-velocity model for theEurasia-Africa plate boundary region[J].Geophys J Int,158:109--130.
Nolet G.1990.Partitioned waveforminversion andtwo-dimensional structure under the Network of Autonomous Record-ing Seismographs[J].J Geophys Res,95:8499--8512.
Ritzwoller M H,Levshin AL.1998.Eurasian surface wave tomography:Group velocities[J].J Geophys Res,103(B3):4839--4878.
van der Lee S,Nolet G.1997.Upper-mantle S velocity structure of North America[J].J Geophys Res,102:22815--22838.
Villasen～or A,Ritzwoller M H,Levshin AL,Barmin MP,Engdahl E R,Spakman W,Trampert J.2001.Shear velocitystructure of central Eurasia frominversion of surface wave velocities[J].Phys Earth Planet Ints,123:169--184.
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