南海东北部三分量海底地震仪记录中横波的识别和分析
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摘要
纵横波联合应用可以得到更多的有关各岩石圈层的岩性、物性等深部结构信息,将有效降低地壳结构研究中地质解释的多解性.然而,由于海上探测的特殊性,转换横波的记录较少,再加上转换横波的复杂性,使得横波研究一直是南海深部地壳结构研究中的弱项.南海东北部OBS-2001测线,布设11个三分量海底地震仪(OBS)记录地震数据,经过极化处理、带通滤波等方法处理后,目前在9个OBS径向分量记录中识别出转换横波震相.基于OBS7数据详细阐述了横波识别这一重要基础环节,并运用简单理论模型试算和射线追踪,确定了OBS7记录剖面中来自地壳与Moho面的PwSc,PgSs,PnSc,PmS等几组转换横波震相,该研究结果不仅为横波速度结构及Poisson比物性剖面提供数据保证,而且为今后横波信息的有效利用提供经验与借鉴,对南海岩石圈结构的精细研究具有重要意义.
引文
1丘学林,施小斌,阎贫,等.南海北部地壳结构的深地震探测和研究新进展.自然科学进展,2003,13(3):231—236
2姚伯初,曾维军,Hayes DE,等.中美合作调研南海地质专报.北京:中国地质大学出版社,1994,1—203
3Nissen SS,Hayes DE,Buhl P,et al.Deep penetrating seismic sounding across the northern margin of the South China Sea.J Geophys Res,1995,100(B11):22407—22433
4Qiu XL,Ye SY,Wu SM,et al.Crustal structure across the Xisha Trough,northwestern South China Sea.Tectonophysics,2001,341:179—193
5Xia KY,Zhou D,Su DQ,et al.The velocity structure of the Yinggehai basin andits hydrocarboni mplication.Chinese Science Bulletin,1998,43(24):2047—2055
6阮爱国,李家彪,冯占英,等.海底地震仪及其国内外发展现状.东海海洋,2004,22(2):19—27
7陆基孟,著.地震勘探原理.山东:石油大学出版社,1993
8Kodaira S,Bellenberg M,Ieasaki T,et al.Vp/Vs ratio struc-ture of the Lofoten continental margin,northern Norway,andits geological i mplications.Geophys J Int,1996,124:724—740
9Mjelde R,Raum T,Digranes P,et al.Vp/Vs ratio along the Voring margin,NE Atlantic,derived from OBS data:I mplica-tions on lithology and stress field.Tectonophysics,2003,369:175—197
10Tinivella U,Accaino F.Compressional velocity structure and Poisson’s ratio in marine sedi ments with gas hydrate and free gas by inversion of reflected and refracted seismic data(South Shetland Islands,Antarctica).Marine Geology,2000,164,13—27
11Wilkens R,Si mmons G,Caruso L.The ratio Vp/Vs as a dis-cri minant of composition for siliceous li mestones.Geophysics,1984,49:1850—1860
12Johnston JE,Christensen NI.Shear wave reflectivity,anisotro-pies,Poisson’s ratios,and densities of a southern Appalachian Paleozoic sedi mentary sequence.Tectonophysics,1992,210:1—20
13Christensen NI,Mooney WD.Seismic velocity structure and composition of the continental crust:A global view.J Geophys Res,1995,100(B7):9761—9788
14Christenson NI.Poisson’s ratio and crustal seismology.J Geo-phys Res,1996,101(B2):3139—3156
15Yan P,Zhou D,Liu ZS.A crustal structure profile across the northern continental margin of the South China Sea.Tectono-physics,2001,338(1):1—21
16Chen AT,Nakamura Y.Velocity structure beneath eastern off-shore of southern Tai wan based on OBS data andits tectonic sig-nificance.TAO,1998,9(3):409—424
17Nakamura Y,McIntosh K,Chen AT.Preli minary results of a large offset seismic survey west of Hengchun Peninsula,south-ern Tai wan.TAO,1998,9(3):395—408
18Wang TK,Chen MK,Lee CS,et al.Seismic i maging of the transitional crust across the northeastern margin of the South China Sea.Tectonophysics,2006,412:237—254
19周龙泉,刘福田,刘劲松,等.利用τ-P波场反演法确定东沙群岛的地壳速度模型.地球物理学进展,2005,20(2):503—506
20阎贫.海底地震仪记录中的横波.海洋地质与第四纪地质,1998,18(1):115—118
21夏戡原,黄慈流,黄志明.南海东北部东沙-澎湖-北港高磁异常隆起带及南侧磁静区的深部地壳结构特征.见:中国大陆地球深部结构与动力学研究,庆贺滕吉文院士从事地球物理研究50周年论文集,北京:科学出版社,2004,454—465
22丘学林,赵明辉,叶春明,等.南海东北部海陆联测与海底地震仪探测.大地构造与成矿学,2003,27(4):295—302
23赵明辉,丘学林,叶春明,等.南海东北部海陆联测及滨海断裂带深部结构研究.地球物理学报,2004,47(5):845—852
24赵明辉,丘学林,夏戡原,等.南海东北部海陆联测地震数据处理及初步结果.热带海洋学报,2004,23(1):58—63
25Au D,Clowes RM.Shear wave velocity structure of the oceanic lithosphere fromocean bottomseismometer studies.Geophys JR Astr Soc,1983,1—38
26刘志,张先康,王夫运,等.用地震走时反演计算长白山天池火山区二维地壳泊松比.地震学报,2005,27(3):324—331
27闻则刚,杨马陵,叶秀薇,等.广东省东部地区的S波速度结构.西北地震学报,2005,27(2):154—157
28Digranes P,Mjelde R,Kodaira S,et al.Aregional shear wave velocity model in the central Voring Basin,N Norway,using three-component Ocean Bottom Seismometer.Tectonophysics,1998,293:157—174
29Sato T,Sato T,Shinohara M,et al.P-wave velocity structure of the margin of the southeastern Tsushi ma basin in the Japan Sea using ocean bottom seismometers and airguns.Tectonophysics,2006,412:159—171
30Miura S,Suyehiro K,Shinohara M,et al.Seismological struc-ture andi mplication of collision between the Ontong Java Plateau and Solomon Island Arc from ocean bottom seismometer-airgun data.Tectonophysics,2004,389:191—220
31Operto S,Charvis P.Deep structure of the southern Kerguelen Plateau(southern Indian Ocean)fromocean bottomseismometer wide-angle seismic data.Journal of Geophysical Research-Solid Earth,1996,101(B11):25077—25103
2姚伯初,曾维军,Hayes DE,等.中美合作调研南海地质专报.北京:中国地质大学出版社,1994,1—203
3Nissen SS,Hayes DE,Buhl P,et al.Deep penetrating seismic sounding across the northern margin of the South China Sea.J Geophys Res,1995,100(B11):22407—22433
4Qiu XL,Ye SY,Wu SM,et al.Crustal structure across the Xisha Trough,northwestern South China Sea.Tectonophysics,2001,341:179—193
5Xia KY,Zhou D,Su DQ,et al.The velocity structure of the Yinggehai basin andits hydrocarboni mplication.Chinese Science Bulletin,1998,43(24):2047—2055
6阮爱国,李家彪,冯占英,等.海底地震仪及其国内外发展现状.东海海洋,2004,22(2):19—27
7陆基孟,著.地震勘探原理.山东:石油大学出版社,1993
8Kodaira S,Bellenberg M,Ieasaki T,et al.Vp/Vs ratio struc-ture of the Lofoten continental margin,northern Norway,andits geological i mplications.Geophys J Int,1996,124:724—740
9Mjelde R,Raum T,Digranes P,et al.Vp/Vs ratio along the Voring margin,NE Atlantic,derived from OBS data:I mplica-tions on lithology and stress field.Tectonophysics,2003,369:175—197
10Tinivella U,Accaino F.Compressional velocity structure and Poisson’s ratio in marine sedi ments with gas hydrate and free gas by inversion of reflected and refracted seismic data(South Shetland Islands,Antarctica).Marine Geology,2000,164,13—27
11Wilkens R,Si mmons G,Caruso L.The ratio Vp/Vs as a dis-cri minant of composition for siliceous li mestones.Geophysics,1984,49:1850—1860
12Johnston JE,Christensen NI.Shear wave reflectivity,anisotro-pies,Poisson’s ratios,and densities of a southern Appalachian Paleozoic sedi mentary sequence.Tectonophysics,1992,210:1—20
13Christensen NI,Mooney WD.Seismic velocity structure and composition of the continental crust:A global view.J Geophys Res,1995,100(B7):9761—9788
14Christenson NI.Poisson’s ratio and crustal seismology.J Geo-phys Res,1996,101(B2):3139—3156
15Yan P,Zhou D,Liu ZS.A crustal structure profile across the northern continental margin of the South China Sea.Tectono-physics,2001,338(1):1—21
16Chen AT,Nakamura Y.Velocity structure beneath eastern off-shore of southern Tai wan based on OBS data andits tectonic sig-nificance.TAO,1998,9(3):409—424
17Nakamura Y,McIntosh K,Chen AT.Preli minary results of a large offset seismic survey west of Hengchun Peninsula,south-ern Tai wan.TAO,1998,9(3):395—408
18Wang TK,Chen MK,Lee CS,et al.Seismic i maging of the transitional crust across the northeastern margin of the South China Sea.Tectonophysics,2006,412:237—254
19周龙泉,刘福田,刘劲松,等.利用τ-P波场反演法确定东沙群岛的地壳速度模型.地球物理学进展,2005,20(2):503—506
20阎贫.海底地震仪记录中的横波.海洋地质与第四纪地质,1998,18(1):115—118
21夏戡原,黄慈流,黄志明.南海东北部东沙-澎湖-北港高磁异常隆起带及南侧磁静区的深部地壳结构特征.见:中国大陆地球深部结构与动力学研究,庆贺滕吉文院士从事地球物理研究50周年论文集,北京:科学出版社,2004,454—465
22丘学林,赵明辉,叶春明,等.南海东北部海陆联测与海底地震仪探测.大地构造与成矿学,2003,27(4):295—302
23赵明辉,丘学林,叶春明,等.南海东北部海陆联测及滨海断裂带深部结构研究.地球物理学报,2004,47(5):845—852
24赵明辉,丘学林,夏戡原,等.南海东北部海陆联测地震数据处理及初步结果.热带海洋学报,2004,23(1):58—63
25Au D,Clowes RM.Shear wave velocity structure of the oceanic lithosphere fromocean bottomseismometer studies.Geophys JR Astr Soc,1983,1—38
26刘志,张先康,王夫运,等.用地震走时反演计算长白山天池火山区二维地壳泊松比.地震学报,2005,27(3):324—331
27闻则刚,杨马陵,叶秀薇,等.广东省东部地区的S波速度结构.西北地震学报,2005,27(2):154—157
28Digranes P,Mjelde R,Kodaira S,et al.Aregional shear wave velocity model in the central Voring Basin,N Norway,using three-component Ocean Bottom Seismometer.Tectonophysics,1998,293:157—174
29Sato T,Sato T,Shinohara M,et al.P-wave velocity structure of the margin of the southeastern Tsushi ma basin in the Japan Sea using ocean bottom seismometers and airguns.Tectonophysics,2006,412:159—171
30Miura S,Suyehiro K,Shinohara M,et al.Seismological struc-ture andi mplication of collision between the Ontong Java Plateau and Solomon Island Arc from ocean bottom seismometer-airgun data.Tectonophysics,2004,389:191—220
31Operto S,Charvis P.Deep structure of the southern Kerguelen Plateau(southern Indian Ocean)fromocean bottomseismometer wide-angle seismic data.Journal of Geophysical Research-Solid Earth,1996,101(B11):25077—25103
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