利用接收函数方法研究大盈江断裂两侧S波速度结构
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摘要
利用研究区(24.2°~25.2°N,97.5°~98.5°E)内大盈江断裂两侧5个流动数字地震台站记录到的宽频带远震P波波形数据进行接收函数反演,得到台站下方0~100 km深度范围内地壳、上地幔S波速度细结构.结果表明:研究区内,以大盈江断裂为界,其西北侧Moho面深度约为38 km;东南侧Moho面深度为40~42 km.断裂两侧地壳、上地幔S波速度结构存在显著差异,东南侧台站下方地壳和上地幔均存在大范围低速区;西北侧台站下方地壳内存在低速层,而上地幔中无明显低速层.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 24.2°—25.2°N,97.5°—98.5°E.The studied five digital seismic stations distributed in the both sides of the Dayingjiang fault in the studied area.The S-wave velocity structures within the depth of 0—100 km beneath five stations are inversed from the broadband teleseismic P waveforms by receiver function.The results show:In the northwest side of the Dayingjiang fault,the depth of Moho is about 38 km,and in the southeast side,the depth of Moho is 40—42 km.The S-wave velocity structures of the crust and upper mantle differ obviously in the both sides of the fault.In the southeast side,there are lower velocity zones in both crust and upper mantle beneath the stations;but in the northwest side,there are lower velocity zones only in the crust beneath the stations.In the studied area,the S-wave velocity structures shows strong horizontal heterogeneity.
The studied area is 24.2°—25.2°N,97.5°—98.5°E.The studied five digital seismic stations distributed in the both sides of the Dayingjiang fault in the studied area.The S-wave velocity structures within the depth of 0—100 km beneath five stations are inversed from the broadband teleseismic P waveforms by receiver function.The results show:In the northwest side of the Dayingjiang fault,the depth of Moho is about 38 km,and in the southeast side,the depth of Moho is 40—42 km.The S-wave velocity structures of the crust and upper mantle differ obviously in the both sides of the fault.In the southeast side,there are lower velocity zones in both crust and upper mantle beneath the stations;but in the northwest side,there are lower velocity zones only in the crust beneath the stations.In the studied area,the S-wave velocity structures shows strong horizontal heterogeneity.
引文
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[18]刘建华,胥颐,赵凤文,等.滇西地区特提斯造山带数字地震流动观测研究[C]//陈运泰,等.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.北京:地震出版社,2004,212-219.
[19]胥颐,刘建华,傅竹武,等.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,2003,22(2):83-88.
[20]LANGSTON C A.Structure under Mount Rainier,Washington,inferred from teleseismic body waves[J].J Geophys Res,1979,84(B9):4 749-4 762.
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[22]吴庆举,田小波,张乃铃,等.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,2003,25(4):382-389.
[23]AMMON C J.The isolation of receiver effects fromteleseismic P waveforms[J].Bull Seismol Soc Am,1991,81(6):2 504-2 510.
[24]KENNETT B L N.Seismic wave propagation in strati-fied media[J].New York:Cambridge UniversityPress,1983.
[25]RANDALL G E.Efficient calculation of differentialseismograms for lithospheric receiver functions[J].Geophys J Int,1989,99(3):469-481.
[26]CONSTABLE S C,PARKER R L,CONSTABLE CG.Occam’s inversion:a practical algorithm for gener-ating smooth models from electromagnetic soundingdata[J].Geophysics,1987,52(3):289-300.
[27]AMMON C J,RANDALL G E,ZANDT G.On thenonuniqueness of receiver function inversions[J].JGeophys Res,1990,95(B10):15 303-15 318.
[2]向宏发,虢顺民,徐锡伟,等.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,2000,22(3):253-264.
[3]钟大赉,吴根耀,赵永贵,等.滇川西部古特提斯造山带[M].北京:科学出版社,1998.
[4]胡鸿翔,陆涵行,王椿镛,等.滇西地区地壳结构的爆破地震研究[J].地球物理学报,1986,29(2):133-144.
[5]林中洋,胡鸿翔,张文彬,等.滇西地区地壳上地幔速度结构特征的研究[J].地震学报,1993,15(4):427-440.
[6]白志明,王椿镛.云南地区上部地壳结构和地震构造环境的层析成像研究[J].地震学报,2003,25(2):117-127.
[7]吴建平,明跃红,王椿镛.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,2001,44(2):228-237.
[8]贺传松,王椿镛,吴建平.用远震接收函数研究滇西地区的深部结构[J].地震学报,2004,26(3):238-246.
[9]刘福田,刘建华,何建坤,等.滇西特提斯造山带下扬子地块的俯冲板片[J].科学通报,2000,45(1):79-84.
[10]钟大赉,丁林,刘福田,等.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),2000,30(增刊):1-8.
[11]王椿镛,楼海,吴建平,等.腾冲火山地热区地壳结构的地震学研究[J].地震学报,2002,24(3):231-242.
[12]楼海,王椿镛,皇甫岗,等.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,2002,24(3):243-251.
[13]贺传松,王椿镛,吴建平.腾冲火山区S波速度结构接收函数反演[J].地震学报,2004,26(1):11-18.
[14]秦嘉政,皇甫岗,李强,等.腾冲火山及邻区速度结构的三维层析成像[J].地震研究,2000,23(2):157-164.
[15]姜朝松,周真恒,赵兹平.腾冲火山区地壳及上地幔结构特征[J].地震研究,2004,27(增刊):1-6.
[16]傅竹武,王苏,刘建华,等.利用接收函数方法研究瑞丽-龙陵断裂两侧S波速度结构[J].地震研究,2007,30(3):223-228.
[17]赵宏,杨海燕.接收函数线性及非线性反演方法对比[J].云南大学学报:自然科学版,2007,29(S1):513-520.
[18]刘建华,胥颐,赵凤文,等.滇西地区特提斯造山带数字地震流动观测研究[C]//陈运泰,等.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.北京:地震出版社,2004,212-219.
[19]胥颐,刘建华,傅竹武,等.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,2003,22(2):83-88.
[20]LANGSTON C A.Structure under Mount Rainier,Washington,inferred from teleseismic body waves[J].J Geophys Res,1979,84(B9):4 749-4 762.
[21]OWENS T J,ZANDT G,TAYLOR S R.Seismic evi-dence for an ancient rift beneath the CumberlandPlateau,Tennessee:A detailed analysis of broadbandteleseismic P waveforms[J].J Geophys Res,1984,89(B9):7 783-7 795.
[22]吴庆举,田小波,张乃铃,等.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,2003,25(4):382-389.
[23]AMMON C J.The isolation of receiver effects fromteleseismic P waveforms[J].Bull Seismol Soc Am,1991,81(6):2 504-2 510.
[24]KENNETT B L N.Seismic wave propagation in strati-fied media[J].New York:Cambridge UniversityPress,1983.
[25]RANDALL G E.Efficient calculation of differentialseismograms for lithospheric receiver functions[J].Geophys J Int,1989,99(3):469-481.
[26]CONSTABLE S C,PARKER R L,CONSTABLE CG.Occam’s inversion:a practical algorithm for gener-ating smooth models from electromagnetic soundingdata[J].Geophysics,1987,52(3):289-300.
[27]AMMON C J,RANDALL G E,ZANDT G.On thenonuniqueness of receiver function inversions[J].JGeophys Res,1990,95(B10):15 303-15 318.
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