Analysis of the wide angle seismic wave field character
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摘要: 地震宽角反射/折射方法主要是利用壳内与上地幔顶层的广角反射信息重建地壳上地幔结构,是研究地壳上地幔结构构造最有效的方法之一.同时,宽角地震接收到的超临界角的广角反射信息,相对于临界角之内的反射信息必定存在着随偏移距变化的时移现象.本文通过构建地壳模型采用交错网格有限差分方法合成广角地震记录,并从理论地震图上分别用传统射线方法和考虑时移影响的方法标定了震相走时,分析了广角反射的地震波场特征,揭示了地震资料中的广角效应,继而分析了广角信息存在对接收波场的响应影响.Abstract: The seismic wide-angle reflection/refraction method is the one of the most effective methods for probing the crustal and upper mantle structure. It mainly uses the wide-angle reflection information from the boundary in the crust and the top boundary of the upper mantle to reconstruct the crust and upper mantle structure. At the same time, we think relative to the pre-critical angle reflection information the post critical angle reflection information that received by wide-angle seismic data exits a time shift effect with the offset variation, and then it must cause the error for velocity analysis and structure image. we studied the features of the wide-angle seismic wave field through building the crust model to know the wide-angle influence on crust velocity image, through building crust model, we labeled the travel time for all the phases by ray tracing method and remove wide-angle effects method, it revealed the wide-angle effect exists in the seismic data.
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Key words:
- wide-angle seismic reflection /
- wide-angle effect /
- post critical angle /
- phase shift
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[1] 滕吉文.20世纪地球物理学的重要成就和21世纪的发展前沿[J].地学前缘, 2003, 10(1): 117-140.Teng J W.Great achievements in geophysics in the 20th century and developing frontiers for the 21st century[J].Earth Science Frontiers (in Chinese), 2003, 10(1): 117-140.
[2] Navin D A, Peirce C.The RAMESSES experiment-II.Evidence for accumulated melt beneath a slow spreading ridge from wide-angle refraction and multichannel reflection seismic profiles[J].Geophysical Journal International (in Chinese), 1998, 135(3): 746-772.
[3] Chen J F, John B M.Crustal evolution of southeastern China: Nd and Sr isotopic evidence[J].Tectonophysics, 1998, 284(1-2): 101-133.
[4] Fliedner M M, White R S.Using wide-angle seismic data for basalt and sub-basalt imaging[J].69th Annual International Meeting, SEG, Expanded Abstracts, 1999: 985-988.
[5] Bleibinhaus F, Bruckl E.ALP2002 Working Group, Wide-angle observations of ALP 2002 shots on the TRANSALP profile: Linking the two DSS projects[J].Tectonophysics, 2006, 414: 71-78.?
[6] Fruehn J, Fliedner M M, White R S.Integrated wide-angle and near-vertical subbasalt study using large-aperture seismic data from the Faeroe-Shetland region[J].Geophysics, 2001, 66(5): 1340-1348.
[7] Grad M, Jensen S L, Keller G R, et al.Crustal structure of the Trans-European suture zone region along POLONAISE 97 seismic profile P4[J].J.Geophys.Res., 2003, 108(B11): 2541, doi:10.1029/2003JB002426.
[8] Hobro J W, Singh D, Minshull S C.Three-dimensional tomographic inversion of combined reflection and refraction seismic data[J].Geophys.J.Int., 2003, 152(1): 79-93.
[9] 滕吉文.中国大陆地壳与上地幔精细结构探测十条第一剖面和其作用与科学意义[J].地球物理学进展, 2008, 23(5): 1341-1354.Teng J W.Ten profiles of artificial-seismic sounding to fine structure of crust and upper mantle in Chinese mainland: The first profiles and its scientific implications[J].Progress in Geophysics (in Chinese), 2008, 23(5): 1341-1354.
[10] 阮爱国, 牛雄伟, 丘学林,等.穿越南沙礼乐滩的海底地震仪广角地震试验[J].地球物理学报, 2011, 54(12): 3139-3149.Ruan A G, Niu X W, Qiu X L, et al.A wide angle ocean bottom seismometer profile across Liyue bank, the southern margin of South China Sea[J].Chinese J.Geophys.(in Chinese), 2011, 54(12): 3139-3149.
[11] 任枭, 徐志国, 杨辉,等.鄂尔多斯地块东南缘地带Moho深度变化特征研究[J].地球物理学报.2012, 55(12): 4089-4096.Ren X, Xu Z G, Yang H, et al.Moho depth distribution character beneath the Ordos block's southeastern margin areas[J].Chinese J.Geophys.(in Chinese), 2012, 55(12): 4089-4096.
[12] 王晨阳, 黄金莉.应用接收函数方法研究海南及其邻区地幔转换带结构[J].地球物理学报, 2012, 55(4): 1161-1167.Wang C Y, Huang J L.Mantle transition zone structure around Hainan by receiver function analysis[J].Chinese J.Geophys.(in Chinese), 2012, 55(4): 1161-1167.
[13] 滕吉文, 熊绍柏, 尹周勋,等.喜马拉雅山北部地区的地壳结构模型和速度分布特征[J].地球物理学报, 1983, 26(6): 525-540.Teng J W, Xiong S B, Yin Z X, et al.Structure of the crust and upper mantle pattern and velocity distributional characteristics at northern region of the Himalayan Mountains[J].Chinese J.Geophys.(in Chinese), 1983, 26(6): 525-540.
[14] 滕吉文, 尹周勋, 熊绍柏.西藏高原北部地区色林错-蓬错-那曲-索县地带地壳结构与速度分布[J].地球物理学报, 1985, 28(增刊I): 28-42.Teng J W, Yin Z X, Xiong S B.Crustal structure and velocity distribution beneath the Serlin Co-peng Co-naqu-suo county region in the northern Xizang (Tibet) plateau[J].Chinese J.Geophys.(in Chinese), 1985, 28(S1): 28-42.
[15] 熊绍柏, 滕吉文, 尹周勋.西藏高原地区的地壳厚度和莫氏面的起伏[J].地球物理学报, 1985, 28(增刊I): 16-27.Xiong S B, Teng J W, Yin Z X.Undulation of Moho interface and density anomaly of upper mantle under the himalayas and vicinity[J].Chinese J.Geophys.(in Chinese), 1985, 28(S1): 16-27.
[16] 熊绍柏, 滕吉文, 尹周勋,等.攀西构造带南部地壳与上地幔结构的爆炸地震研究[J].地球物理学报, 1986, 29(3): 235-245.Teng J W, Yin Z X, Xiong S B, et al.Explosion seismological study of the structure of the crust and upper mantle at southern part of the Panxi tectonic belt[J].Chinese J.Geophys.(in Chinese), 1986, 29(3): 235-245.
[17] 崔作舟, 卢德源, 陈纪平,等.攀西地区的深部地壳结构与构造[J].地球物理学报, 1987, 30(6): 566-580.Cui Z Z, Lu D Y, Chen J P, et al.The deep structural and tectonic features of the crust in Panxi area[J].Chinese J.Geophys.(in Chinese), 1987, 30(6): 566-580.
[18] 卢德源, 陈纪平.青藏高原北部沱沱河-格尔木一带地壳深部结构[J].地质评论, 1987, 33(2): 122-128.Lu D Y, Chen J P.Deep-crustal structures in the tuotuo river-golmud region in the northern part of the qinghai-xizang(tibet)plateau[J].Geological Review (in Chinese), 1987, 33(2): 122-128.
[19] 王椿镛, 郑金涵, 胡鸿翔,等.大别造山带的地壳结构研究[J].中国科学(D辑), 1997, 27(3): 221-226.Wang C Y, Zheng J H, Hu H X, et al.Study on crustal structure of Dabie organic[J].Science in China (Ser.D) (in Chinese), 1997, 27(3): 221-226.
[20] 孙建国.广角地震在碳酸盐岩地区勘探中的应用[C].//反射地震学论文集[M].上海: 同济大学出版社, 2000: 127-140.Sun J G.The application on wide-angle seismic in the bare carbonate rock area[C].//Essay Collection on Reflection Seismography (in Chinese)[M].Shanghai: Tongji University Press, 2000: 127-140.
[21] 王志, 贺振华, 黄德济,等.广角反射波场特征研究及正演模拟分析[J].地球物理学进展, 2003, 18(1): 116-121.Wang Z, He Z H, Huang D J, et al.The wave field features researching of wide angle reflection and the analyzing of forward modeling[J].Progress in Geophysics (in Chinese), 2003, 18(1): 116-121.
[22] 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.Bai Z M, Wang C Y.Tomographic investigation of the upper crustal structure and seismotectonic environments in Yunnan Province[J].Acta Seismologica Sinica (in Chinese), 2003, 25(2): 117-127.
[23] 张中杰, 秦义龙, 陈赟,等.由宽角反射地震资料重建壳幔反射结构的相似性剖面[J].地球物理学报, 2004, 47(3): 469-474.Zhang Z J, Qin Y L, Chen Y, et al.Reconstruction of the semblance section for the crust and mantle reflection structure by wide-angle reflection seismic data[J].Chinese J.Geophys.(in Chinese), 2004, 47(3): 469-474.
[24] 张中杰, 白志明, 王椿镛,等.冈瓦纳型和扬子型地块地壳结构: 以滇西孟连-马龙宽角反射剖面为例[J].中国科学D辑(地球科学), 2005, 34(5): 387-392.Zhang Z J, Bai Z M, Wang C Y, et al.Crustal structure of Gondwana and Yangtze blocks: An example by wide angle seismic reflection profiling between Menglian and Malong[J].Science in China (Serial D), 2005, 48(11): 1828-1836.
[25] 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(地球科学), 2005, 35(4): 314-319.Zhang Z J, Bai Z M, Wang C Y, et al.The crustal structure under Sanjiang and its dynamic implications: Revealed by seismic reflection/refraction profiling between Zhefang and Binchuan, Yunnan[J].Science in China (Series D), 2005, 48(9): 1329-1336.
[26] Zhang Z J, Klemperer S L.West-east variation in crustal thickness in northern Lhasa block, central Tibet, from deep seismic sounding data[J].J.Geophys.Res., 2005, 110(B9), doi:10.1029/2004JB003139.
[27] Zhang Z, Jose B, Li Y, et al.Crust-upper mantle seismic velocity structure across Southeastern China[J].Tectonophysics, 2005, 395(1-2): 137-157.
[28] 李可恩, 熊晓军, 杨俊.高速屏蔽层下地震数据的采集[J].天然气地球科学, 2006, 17(4): 527-531.Li K E, Xiong X J, Yang J.Seismic acquisition analysis in the area of high velocity shielding layers[J].Natural Gas Geoscience (in Chinese), 2006, 17(4): 527-531.
[29] 李智宏, 胡中平, 王辉明,等.含高速层地震物理模型的广角地震波场研究[J].勘探地球物理进展, 2005, 28(5): 345-348.Li Z H, Hu Z P, Wang H M, et al.Investigation of WARRP seismic wavefield on physical model with a high velocity layer[J].Progress in Exploration Geophysics (in Chinese), 2005, 28(5): 345-348.
[30] 张中杰, 何樵登, 滕吉文.二维横向各向同性介质中弹性波场差分法模拟稳定性研究[J].长春地质学院学报, 1993, 23(2): 205-211.Zhang Z J, He Q D, Teng J W.Stability study for elastic wavefield modelling with finite difference method in 2-d tim[J].Journal of Changchun University of Earth Science (in Chinese), 1993, 23(2): 205-211.
[31] 张中杰, 何樵登.含裂隙介质中地震波运动学问题的正演模拟[J].石油地球物理勘探, 1989, 24(3): 290-300.Zhang Z J, He Q D.Forward modeling of kinematic problems of seismic wave in fractured medium[J].Oil Geophysical Prospecting (in Chinese), 1989, 24(3): 290-300.
[32] 张中杰, 何樵登, 徐中信.二维横向各向同性介质中人为边界反射的吸收-差分法弹性波场模拟[J].地球物理学报, 1993, 36(4): 519-527.Zhang Z J, He Q D, Xu Z X.The absorbtion of artifical boundary reflection in 2-D transversely isotropic media with fdm-elastic wavefields modelling[J].Chinese J.Geophys.(in Chinese), 1993, 36(4): 519-527.
[33] 刘永霞, 徐涛, 赵兵,等.自相似型各向异性自组织介质中地震波场动力学响应[J].地球物理学报, 2007, 50(1): 221-232.Liu Y X, Xu T, Zhao B, et al.Seismic sounding of anisotropic self-similar self-organized medium[J].Chinese J.Geophys.(in Chinese), 2007, 50(1): 221-232.
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