利用接收函数研究程海断裂带莫霍面深度和地壳内S波速度结构特征
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摘要
利用程海断裂带附近27个数字地震台站远震波形资料,提取每一个台站的接收函数,计算出各台站莫霍面深度同时利用时间域线性反演方法,获得了各个台站下方的横波速度。结果显示:程海断裂带莫霍面深度从南部42km增至北部的54km,南部和北部莫霍面深度有明显的不同。从程海断裂带下方不同深度S波速度剖面可以看出,宾川及其北东部地区中下地壳存在明显的低速层,此低速层可能与还没有固结的热物质有关。而永胜南部地区,地壳中S波速度垂直变化剧烈,低速异常高速异常交替丛生,这可能是此区地震频发的主要原因。同时,本文对宽频带地震仪和短周期地震仪得到的接收函数进行了初步的对比分析。
We used teleseismic records from the temporary and fixed stations near the Chenghai fault zone.The total of the stations is 27.We get the P-wave receiver functions of every station using the teleseismic waveform.We get the crust thickness and shear velocity using the time domain linear inversion method.The results show the depth of Chenghai fault belt change from 42 km in the south to 54 km in the north.The depth of Moho in the south is more different from the north.The Binchuan and its north eastern area show obvious low-velocity layer from the depth profile.The lower layer is related to the thermal material.Then in the south area of Yongsheng,the vertical change of S wave velocity is more drastical.Low speed and high speed layer exist alternately,which could be the reason why this area has many earthquakes.At the same time,we give the preliminary contrast analysis about the receive functions which were calculated using broad band and short-period seismographs.
We used teleseismic records from the temporary and fixed stations near the Chenghai fault zone.The total of the stations is 27.We get the P-wave receiver functions of every station using the teleseismic waveform.We get the crust thickness and shear velocity using the time domain linear inversion method.The results show the depth of Chenghai fault belt change from 42 km in the south to 54 km in the north.The depth of Moho in the south is more different from the north.The Binchuan and its north eastern area show obvious low-velocity layer from the depth profile.The lower layer is related to the thermal material.Then in the south area of Yongsheng,the vertical change of S wave velocity is more drastical.Low speed and high speed layer exist alternately,which could be the reason why this area has many earthquakes.At the same time,we give the preliminary contrast analysis about the receive functions which were calculated using broad band and short-period seismographs.
引文
[1]国家地震局地质研究所,云南省地震局.滇西北地区活动断裂[M].北京:地震出版社,1990.
[2] Xu Y,Wiens D A.Upper mantle structure of the southwest Pacific from regional waveform inversion[J].J Geophys Res,1997,102:27 439-27 451.
[3] JuliàJ,Ammon C J,Hernmann R B,et al.Joint inversion of receiver function and surface wave dispersion observations[J].Geophys J Int,2000,143:99-112.
[4]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.
[5]胡家富,苏有锦,朱雄关,等.云南的地壳S波速度与泊松比结构及其意义[J].中国科学(D辑),2003,33(8):714-722.
[6]李永华,吴庆举,田小波,等.用接收函数方法研究云南地区及其邻区地壳上地幔结构[J].地球物理学报,2009,52(1):67-80.
[7]查小惠,雷建设.云南地区地壳厚度和泊松比研究[J].中国科学:地球科学,2013,43(3):446-456.
[8]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,1986,29:133-144.
[9]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(3):427-440.
[10]阚荣举,张四昌,晏凤桐,等.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-110.
[11]阚荣举,林中洋.云南地壳上地幔构造的初步研究[J].中国地震,1986,2(4):50-61.
[12]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.
[13]胥颐,杨晓涛,刘建华.云南地区地壳速度结构的层析成像研究[J].地球物理学报,2013,56(6):1 904-1 914.
[14]郑定昌,盖增喜,杨润海.云南地区背景噪声层析成像[J].地震学报,2014,36(4):602-614.
[15]张晓曼,胡家富,胡毅力,等.云南壳幔S波速度结构与强震的构造背景[J].地球物理学报,2011,54(5):1 222-1 232.
[16]张智,陈赟,李飞.利用地震面波频散重建川滇地区壳幔S波速度[J].地球物理学报,2008,51(4):1 114-1 122.
[17] Langston C A.Structure under Mount Rainer,Washington,inferred from teleseismic body waves[J].J Geophys Res,1979,84(B9):4 749-4 762.
[18] Owens T J,Taylor S R,Zandt G.Crustal structure at regional seismic test network stations determined from inversion of broadband teleseismic P waveforms[J].Bull Seism Soc Amer,1987,77:631-632.
[19] Randall G E.Efficient calculation of differential seismograms for lithospheric receiver functions[J].J Geophys Int,1989,99:469-481.
[20] Ammon C J,Randall G E,Zandt G.On the non-uniqueness of receiver function inversions[J].J Geophys Res,1990,95(B10):15 303-15 318.
[21] Randall G E.Efficient calculation of complete differential seismograms for laterally homogeneous Earth models[J].Geophys J Int,1994,118:245-254.
[22] Shaw P R,Orcutt J A.Waveform inversion of seismic refraction data and applications to young Pacific crust[J].Geopys J R Astron Soc,1985,82:375-414.
[23]张中杰,白志明,王椿镛,等.三江地区地壳结构及动力学意义:云南遮放—宾川地震反射/折射剖面的启示[J].中国科学(D辑),2005,35(4):314-319.
[24] Ammon C J,Randall G E,Zandt G.On the non-uniqueness of receiver function inversions[J].J Geophys Res,1995,95(H10):15 303-15 318.
[25]毛玉平,等.云南地区强震(M≥6)研究[M].云南:云南科技出版社,2013.
[26]熊绍柏,郑晔,尹周勋,等.丽江—攀枝花—者海地带二维地壳结构及其构造意义[J].地球物理学报,1993,36(4):434-444.
[2] Xu Y,Wiens D A.Upper mantle structure of the southwest Pacific from regional waveform inversion[J].J Geophys Res,1997,102:27 439-27 451.
[3] JuliàJ,Ammon C J,Hernmann R B,et al.Joint inversion of receiver function and surface wave dispersion observations[J].Geophys J Int,2000,143:99-112.
[4]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.
[5]胡家富,苏有锦,朱雄关,等.云南的地壳S波速度与泊松比结构及其意义[J].中国科学(D辑),2003,33(8):714-722.
[6]李永华,吴庆举,田小波,等.用接收函数方法研究云南地区及其邻区地壳上地幔结构[J].地球物理学报,2009,52(1):67-80.
[7]查小惠,雷建设.云南地区地壳厚度和泊松比研究[J].中国科学:地球科学,2013,43(3):446-456.
[8]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,1986,29:133-144.
[9]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(3):427-440.
[10]阚荣举,张四昌,晏凤桐,等.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-110.
[11]阚荣举,林中洋.云南地壳上地幔构造的初步研究[J].中国地震,1986,2(4):50-61.
[12]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.
[13]胥颐,杨晓涛,刘建华.云南地区地壳速度结构的层析成像研究[J].地球物理学报,2013,56(6):1 904-1 914.
[14]郑定昌,盖增喜,杨润海.云南地区背景噪声层析成像[J].地震学报,2014,36(4):602-614.
[15]张晓曼,胡家富,胡毅力,等.云南壳幔S波速度结构与强震的构造背景[J].地球物理学报,2011,54(5):1 222-1 232.
[16]张智,陈赟,李飞.利用地震面波频散重建川滇地区壳幔S波速度[J].地球物理学报,2008,51(4):1 114-1 122.
[17] Langston C A.Structure under Mount Rainer,Washington,inferred from teleseismic body waves[J].J Geophys Res,1979,84(B9):4 749-4 762.
[18] Owens T J,Taylor S R,Zandt G.Crustal structure at regional seismic test network stations determined from inversion of broadband teleseismic P waveforms[J].Bull Seism Soc Amer,1987,77:631-632.
[19] Randall G E.Efficient calculation of differential seismograms for lithospheric receiver functions[J].J Geophys Int,1989,99:469-481.
[20] Ammon C J,Randall G E,Zandt G.On the non-uniqueness of receiver function inversions[J].J Geophys Res,1990,95(B10):15 303-15 318.
[21] Randall G E.Efficient calculation of complete differential seismograms for laterally homogeneous Earth models[J].Geophys J Int,1994,118:245-254.
[22] Shaw P R,Orcutt J A.Waveform inversion of seismic refraction data and applications to young Pacific crust[J].Geopys J R Astron Soc,1985,82:375-414.
[23]张中杰,白志明,王椿镛,等.三江地区地壳结构及动力学意义:云南遮放—宾川地震反射/折射剖面的启示[J].中国科学(D辑),2005,35(4):314-319.
[24] Ammon C J,Randall G E,Zandt G.On the non-uniqueness of receiver function inversions[J].J Geophys Res,1995,95(H10):15 303-15 318.
[25]毛玉平,等.云南地区强震(M≥6)研究[M].云南:云南科技出版社,2013.
[26]熊绍柏,郑晔,尹周勋,等.丽江—攀枝花—者海地带二维地壳结构及其构造意义[J].地球物理学报,1993,36(4):434-444.
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