利用接收函数方法研究瑞丽—龙陵断裂两侧S波速度结构
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摘要
利用研究区(23.9°～25.1°N,97.8°～99.0°E)内瑞丽—龙陵断裂两侧4个流动数字地震台记录到的宽频带远震P波波形数据进行接收函数反演,得到了台站下方0～100km深度范围内地壳、上地幔的S波速度细结构。结果如下:(1)在研究区内,以瑞丽—龙陵断裂为界,其西北侧Moho面深度为38～40km,东南侧Moho面深度约为38km。(2)断裂两侧地壳、上地幔S波速度结构存在显著差异,西北侧台站下方地壳和上地幔均存在大范围低速区;东南侧台站下方上地幔中无明显低速层,地壳内存在低速层,但范围和速度差都较小。(3)断裂两侧台站下方地壳和上地幔S波速度结构的较大差异,证明它们分属不同的构造单元。(4)研究区内的S波速度结构存在明显的横向非均匀性。
The studied area is 23.9°-25.1°N,97.8°-99°E.The studied four digital seismic stations distributed in the both sides of the Ruili-Longling fault in the studied area.The S-wave velocity structures within the depth of 0-100 km beneath four stations are inversed from the broadband teleseismic P waveforms by receiver function.The results show:(1)In the northwest side of the Ruili-Longling fault,the depth of Moho is 38-40 km,and in the southeast side,the depth of Moho is about 38 km.(2)The S-wave velocity structures of the crust and upper mantle differ obviously in the both sides of the fault.In the northwest side,there are lower velocity zones in both crust and upper mantle beneath the stations;but in the southeast side,there are lower velocity zones only in the crust beneath the stations,and their range and velocity difference are small.(3)It is proved by the obvious difference of S-wave velocity structures between the both sides that the both sides of the Ruili-Longling fault belong to different structural units.(4)In the study area,the S wave velocity structure shows strong horizontal heterogeneity.
The studied area is 23.9°-25.1°N,97.8°-99°E.The studied four digital seismic stations distributed in the both sides of the Ruili-Longling fault in the studied area.The S-wave velocity structures within the depth of 0-100 km beneath four stations are inversed from the broadband teleseismic P waveforms by receiver function.The results show:(1)In the northwest side of the Ruili-Longling fault,the depth of Moho is 38-40 km,and in the southeast side,the depth of Moho is about 38 km.(2)The S-wave velocity structures of the crust and upper mantle differ obviously in the both sides of the fault.In the northwest side,there are lower velocity zones in both crust and upper mantle beneath the stations;but in the southeast side,there are lower velocity zones only in the crust beneath the stations,and their range and velocity difference are small.(3)It is proved by the obvious difference of S-wave velocity structures between the both sides that the both sides of the Ruili-Longling fault belong to different structural units.(4)In the study area,the S wave velocity structure shows strong horizontal heterogeneity.
引文
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贺传松,王椿镛,吴建平.2004a.用远震接收函数研究滇西地区的深部结构[J].地震学报,26(3):238-246.
贺传松,王椿镛,吴建平.2004b.腾冲火山区S波速度结构接收函数反演[J].地震学报,26(1):11-18.
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刘建华,胥颐,赵凤文,等.2004.滇西地区特提斯造山带数字地震流动观测研究[J].见:陈运泰等主编.中国大陆地震学与地球内部物理学进展——庆祝曾融生院士八十寿辰[M].北京:地震出版社,212-219.
刘启元,Kind R,李顺成.1997.中国数字地震台网的接收函数及其非线性反演[J].地球物理学报,40(3):356-368.
楼海,王椿镛,皇甫岗,等.2002.云南腾冲火山区上部地壳三维地震速度层析成像[J].地震学报,24(3):243-251.
秦嘉政,皇甫岗,李强,等.2000.腾冲火山及邻区速度结构的三维层析成像[J].地震研究,23(2):157-164.
王椿镛,楼海,吴建平,等.2002.腾冲火山地热区地壳结构的地震学研究[J].地震学报,24(3):231-242.
吴建平,明跃红,王椿镛.2001.云南数字地震台站下方的S波速度结构研究[J].地球物理学报,44(2):228-237.
吴庆举,田小波,张乃铃,等.2003.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,25(4):382-389.
向宏发,虢顺民,徐锡伟,等.2000.川滇南部地区活动地块划分与现今运动特征初析[J].地震地质,22(3):253-264.
胥颐,刘建华,傅竹武,等.2003.西沙群岛和哀牢山—红河地区的宽频带地震观测[J].热带海洋学报,22(2):83-88.
曾融生,孙为国.1992.青藏高原及其东部邻区的地震活动性和震源机制以及高原物质东流的讨论[J].地震学报,14(增刊):534-564.
钟大赉,丁林,刘福田,等.2000.造山带岩石层多向层架构造及其对新生代岩浆活动制约——以三江及邻区为例[J].中国科学(D),30(增刊):1-8.
Ammon C J,Randall G E,Zandt G.1990.On the nonuniqueness of re-ceiver function inversions[J].JGR,95(B10):15303-15318.
Ammon C J.1991.The isolation of receiver effects from teleseismic Pwaveforms[J].BSSA,81(6):2504-2510.
Constable S C,Parker R L,Constable C G.1987.Occam′s inversion:apractical algorithmfor generating smooth models fromelectromagnet-ic sounding data[J].Geophysics,52(3):289-300.
Kennett B L N.1983.Seismic wave propagation in stratified media[M].New York:Cambridge University Press.
Langston C A.1979.Structure under Mount Rainier,Washington,in-ferred from teleseismic body waves[J].JGR,84(B9):4749-4762.
Liu Q,Kind R.1986.Lateral variation of the structure of the crust-man-tle boundary from conversions of teleseismic P waves[J].J.Geo-phys.,60:149-156.
Owens TJ,Zandt G,Taylor S R.1984.Seismic evidence for an ancientrift beneath the Cumberland Plateau,Tennessee:A detailed analy-sis of broadband teleseismic P waveforms[J].JGR,89(B9):7783-7795.
Randall G E.1989.Efficient calculation of differential seismograms forlithospheric receiver functions[J].Geophys.J.Int.,99(3):469-481.
贺传松,王椿镛,吴建平.2004a.用远震接收函数研究滇西地区的深部结构[J].地震学报,26(3):238-246.
贺传松,王椿镛,吴建平.2004b.腾冲火山区S波速度结构接收函数反演[J].地震学报,26(1):11-18.
胡鸿翔,陆涵行,王椿镛,等.1986.滇西地区地壳结构的爆破地震研究[J].地球物理学报,29(2):133-144.
姜朝松,周真恒,赵慈平.2004.腾冲火山区地壳及上地幔结构特征[J].地震研究,27(增刊):1-6.
林中洋,胡鸿翔,张文彬,等.1993.滇西地区地壳上地幔速度结构特征的研究[J].地震学报,15(4):427-440.
刘福田,刘建华,何建坤,等.2000.滇西特提斯造山带下扬子地块的俯冲板片[J].科学通报,45(1):79-84.
刘建华,胥颐,赵凤文,等.2004.滇西地区特提斯造山带数字地震流动观测研究[J].见:陈运泰等主编.中国大陆地震学与地球内部物理学进展——庆祝曾融生院士八十寿辰[M].北京:地震出版社,212-219.
刘启元,Kind R,李顺成.1997.中国数字地震台网的接收函数及其非线性反演[J].地球物理学报,40(3):356-368.
楼海,王椿镛,皇甫岗,等.2002.云南腾冲火山区上部地壳三维地震速度层析成像[J].地震学报,24(3):243-251.
秦嘉政,皇甫岗,李强,等.2000.腾冲火山及邻区速度结构的三维层析成像[J].地震研究,23(2):157-164.
王椿镛,楼海,吴建平,等.2002.腾冲火山地热区地壳结构的地震学研究[J].地震学报,24(3):231-242.
吴建平,明跃红,王椿镛.2001.云南数字地震台站下方的S波速度结构研究[J].地球物理学报,44(2):228-237.
吴庆举,田小波,张乃铃,等.2003.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,25(4):382-389.
向宏发,虢顺民,徐锡伟,等.2000.川滇南部地区活动地块划分与现今运动特征初析[J].地震地质,22(3):253-264.
胥颐,刘建华,傅竹武,等.2003.西沙群岛和哀牢山—红河地区的宽频带地震观测[J].热带海洋学报,22(2):83-88.
曾融生,孙为国.1992.青藏高原及其东部邻区的地震活动性和震源机制以及高原物质东流的讨论[J].地震学报,14(增刊):534-564.
钟大赉,丁林,刘福田,等.2000.造山带岩石层多向层架构造及其对新生代岩浆活动制约——以三江及邻区为例[J].中国科学(D),30(增刊):1-8.
Ammon C J,Randall G E,Zandt G.1990.On the nonuniqueness of re-ceiver function inversions[J].JGR,95(B10):15303-15318.
Ammon C J.1991.The isolation of receiver effects from teleseismic Pwaveforms[J].BSSA,81(6):2504-2510.
Constable S C,Parker R L,Constable C G.1987.Occam′s inversion:apractical algorithmfor generating smooth models fromelectromagnet-ic sounding data[J].Geophysics,52(3):289-300.
Kennett B L N.1983.Seismic wave propagation in stratified media[M].New York:Cambridge University Press.
Langston C A.1979.Structure under Mount Rainier,Washington,in-ferred from teleseismic body waves[J].JGR,84(B9):4749-4762.
Liu Q,Kind R.1986.Lateral variation of the structure of the crust-man-tle boundary from conversions of teleseismic P waves[J].J.Geo-phys.,60:149-156.
Owens TJ,Zandt G,Taylor S R.1984.Seismic evidence for an ancientrift beneath the Cumberland Plateau,Tennessee:A detailed analy-sis of broadband teleseismic P waveforms[J].JGR,89(B9):7783-7795.
Randall G E.1989.Efficient calculation of differential seismograms forlithospheric receiver functions[J].Geophys.J.Int.,99(3):469-481.
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