用远震接收函数反演福建地区宽频带台站下方莫霍界面深度
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摘要
收集福建省"九五"数字地震遥测台网中8个宽频带台站的远震波形资料,应用接收函数的研究方法计算各个台站下方的接收函数,采用非线性的反演方法获得这些台站下方的S波速度结构,确定这些台站下方莫霍界面深度的分布情况。分析得到的反演结果,福建地区莫霍面的起伏不大,平均的地壳厚度约为32 km。在0～2 km之间均存在一层低速层,这与地表覆盖着一层松散的沉积层是相对应的。内陆地区台站附近莫霍界面深度较沿海地区略高,沿海台站的莫霍界面深度北部略高于南部。
Based on some teleseismic data collected from seismostations of Fujian digital network("Ninth Five Year Plan" network),we obtained the receiver functions of these stations by the receiver function method,and inversed the crustal S-wave velocity structure under these stations by non-linear inversion method to calculate the depths of Moho.In view of the inversion results of 8 stations,the depth of Moho varies a little,and the average crustal thickness is about 32km.There exists a low velocity layer between 0-2km underground,which might be caused by the loose sediment covered on the surface.The Moho depth of inland areas is a little deeper than coastal areas,and becomes deeper from south to north in coastal areas.
Based on some teleseismic data collected from seismostations of Fujian digital network("Ninth Five Year Plan" network),we obtained the receiver functions of these stations by the receiver function method,and inversed the crustal S-wave velocity structure under these stations by non-linear inversion method to calculate the depths of Moho.In view of the inversion results of 8 stations,the depth of Moho varies a little,and the average crustal thickness is about 32km.There exists a low velocity layer between 0-2km underground,which might be caused by the loose sediment covered on the surface.The Moho depth of inland areas is a little deeper than coastal areas,and becomes deeper from south to north in coastal areas.
引文
①李祖宁.赴美交流访问工作汇报,2007.
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[14]Juan Pablo Ligorría,Ammon C J.Iterative Deconvolution and Receiver-Function Estimation.Bulletin of the Seismological Society of America.1999,89,5:1395-1400.
[15]廖其林,王振明,王屏路,等.福州—泉州—汕头地区地壳结构的爆炸地震研究[J].地球物理学报.1988,31(3):270-280.
[1]Ammon,C.J,Randall,G.E.and Zandt,G.On the non-uniqueness of receiver function inversions[J].J.Geophys.Res.1990,95(B10):15303-15318.
[2]刘启元,Kind,R,李顺成.接收函数的复频谱比的最大或然性估计及其非线性反演[J].地球物理学报.1996,39(4):502-513.
[3]Shamway,R.H.and Der,Z.A.Deconvolution of multiple time series[J].Technometrices,1985,27(4):385-393.
[4]Tarantota,A.Inversion Problem Theory,method for data fitting and model parameter estimation,Elsevier Science Publ.Co.,1987.
[5]Sandvol,Seber,Calvert etc.Gird search modeling of receiver functions:Implications for crustal structure in the Middle East and North Africa[J].J.Geophys.Res.,1998,103(B11):26899-26917.
[6]Sambridge M.Exploring multidimentionl landscapes without a map[J].Inverse Problems.,1998,14:427-440.
[7]吴庆举,田小波,张乃玲,等.接收函数的克希霍夫偏移成像[J].中国地球物理学会年刊,2002,18:465.
[8]Lupei Zhu,Hiroo Kanamori.Moho depth variation in southern California from teleseismic receiver functions[J].J.Geophys.Res.,2000,105(B2):2969-2980.
[9]Katsuhiko Shiomi,Haruo Sato,Kazushige Obara etc.Configuration of subducting Philippine Sea plate beneath southwest Japan revealed from receiver function analysis based on the multivariate autoregressive model[J].J.Geophys.Res.,2004,109,B04308,doi:10.1029/2003JB002774.
[10]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[J].地球物理学报,1998,41(5):669-679.
[11]张先康,张成科,赵金仁,等.长白山天池火山区岩浆系统深部结构的深地震研究[J].地震学报,2002,2(24):135-143.
[12]胡家富,朱雄关,夏静瑜.利用面波和接收函数联合反演滇西地区壳幔速度结构[J].地球物理学报.2005,45(5):1069-1076.
[13]Masayuki Kikuchi,Hiroo Kanamori.Inversion of complex body waves.Bulletin of the Seismological Society of America.1982,72(72):491-506.
[14]Juan Pablo Ligorría,Ammon C J.Iterative Deconvolution and Receiver-Function Estimation.Bulletin of the Seismological Society of America.1999,89,5:1395-1400.
[15]廖其林,王振明,王屏路,等.福州—泉州—汕头地区地壳结构的爆炸地震研究[J].地球物理学报.1988,31(3):270-280.
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