利用远震接收函数研究黄海周边地区的地壳上地幔结构
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摘要
利用宽频带流动台站(YSBSN)记录的远震波形数据和远震接收函数方法,反演了黄海东、西两侧地壳上地幔的S波速度结构.结果表明,莫霍面深度在30～38 km之间变化,位于中方一侧的JNN台下方地壳厚度最大,可以归因于华北板块和扬子板块的碰撞;韩方一侧的地壳厚度自北向南逐渐变厚,但仍然难以厘定朝鲜半岛南部潜在碰撞带的位置,这些问题的解决需要更大范围的流动台站观测.由于部分台站位于巨厚的沉积层和多孔的火山岩之上,与浅部构造的相关性使得接收函数表现出较大振幅的混响,从而影响了来自深部结构的转换震相.
Teleseismic events are used to obtain shear-wave velocity models beneath the stations of the Yellow Sea Broadband Seismic Network (YSBSN).Some stations are located on top of either a thick sedimentary basin or highly porous volcanic rocks and receiver functions at these stations exhibit prominent high-amplitude and long-period reverberations which obscure the subtle phases associated with deeper structures.Due to the shallow subsurface effects in receiver functions,shear-wave velocity models beneath only 8 broadband seismic stations are successfully inverted.Depth to the crust-mantle transition (the Moho) varies from 30 to 38 km beneath YSBSN stations.The thickest crust is observed beneath the station JNN in China,which is attributed to the ancient collision boundary between the North China block and the South China block..Although general increase of the crustal thickness from north to south in Korea is observed with high confidence,it is not possible to delineate the location of potential collision boundary in the southern Korea peninsula,which would require wider coverage by broadband seismic instruments to resolve.
Teleseismic events are used to obtain shear-wave velocity models beneath the stations of the Yellow Sea Broadband Seismic Network (YSBSN).Some stations are located on top of either a thick sedimentary basin or highly porous volcanic rocks and receiver functions at these stations exhibit prominent high-amplitude and long-period reverberations which obscure the subtle phases associated with deeper structures.Due to the shallow subsurface effects in receiver functions,shear-wave velocity models beneath only 8 broadband seismic stations are successfully inverted.Depth to the crust-mantle transition (the Moho) varies from 30 to 38 km beneath YSBSN stations.The thickest crust is observed beneath the station JNN in China,which is attributed to the ancient collision boundary between the North China block and the South China block..Although general increase of the crustal thickness from north to south in Korea is observed with high confidence,it is not possible to delineate the location of potential collision boundary in the southern Korea peninsula,which would require wider coverage by broadband seismic instruments to resolve.
引文
[1] Yin A,Nie S.An Indentation Model for the North and South China Collision Tan-Lu and Honam Fault Systems,Eastern Asia.Tectonics,1993,12(4) :801～813
[2] Ree J H,Cho M,Kwon S T,et al.Possible eastward extension of Chinese collision belt in South Korea:The Imjingangbelt.Geology,1996,24(12) :1071～1074
[3] Chang E Z.Collisional orogene between north and south China and its eatern extension in the Korean Peninsula.Journal of Southeast Asian Earth Sciences,1996,13 (3-5) :267～277
[4] Ishiwatari A,Tsujimori T.Paleozoic ophiolites and blueschists in Japan and Russian Primorye in the tectonic framework of East Asia:A synthesis.The Island Arc,2003,12:190～206
[5] 郝天珧,徐亚,胥颐等.对黄海-东海研究区深部结构的一些新认识.地球物理学报,2006,49(2) :405～416 Hao T,Xu Y,Xu Y,et al.Some new understandings on the deep structure in Yellow Sea and east China Sea.Chinese J.Geophys.,2006,49(2) :405～416
[6] 胥颐,李志伟,Kim K H,等.黄海的地壳速度结构与中朝-扬子块体拼合边界.地球物理学报,2009,52(3) :646～652 Xu Y,Li Z,Kim K H,et al.Crustal velocity structure and collision boundary between the Sino-Korea and Yangtze blocks in the Yellow Sea.Chinese J.Geophys.(in Chinese),2009,52(3) :646～652
[7] Langston C A.Structure under mount Rainier,Washington,inferred from teleseismic body waves.Journal of Geophysical Research,1979,83(B9) :4749～4762
[8] Cassidy J F.Numerical experiments in broadband receiver function analysis.Bulletin-Seismological Society of America,1992,82(3) :1453～1474
[9] Randall G E.Efficient calculation of differential seismograms for lithospheric receiver functions.Geophysical Journal International,1989,99:469～481
[10] 刘启元,Kind R,李顺成.中国数字地震台网的接收函数及其 非线性反演.地球物理学报,1998,40(3) :373～385 Liu Q Y,Kind R,Li S C,Receiver function at the stations of the Chinese digital seismic network (CDSN) and their nonlinear inversion.Chinese J.Geoph ys.(in Chinese),1998,40(3) :373～385
[11] Owens T J,Taylor S R,Zandt.Crustal structure at Regional Seismic Test Network stations determined from inversion of broadband teleseismic P waveforms.Bulletin-Seismological Society of America,1987,77(2) :631～662
[12] Ammon C J.The isolation of reciever effects from teleseismic P waveforms.Bulletin-Seismological Society of America,1991,81:2504～2510
[13] 刘启元,Kind R,李顺成.接收函数复谱比的最大或然性估计及非线性反演.地球物理学报,1996,39:531～543 Liu Q Y,Kind R,Li S C.Maximal likelihood estimation and nonlinear inversion of the complex receiver function spectrum ratio.Chinese J.Geophys.(in Chinese),1996,39:531～543
[14] Kim K H,Chiu J M,Kao H,et al.A Preliminary Study of Crustal Structure in Taiwan Region Using Receiver Function Analysis.Geophysical Journal International,2004,159:146～164
[15] Kennett B L N,Engdahl E R.Traveltimes for global earthquake location and phase identification.Geophysical Journal International,1991,105:429～465
[16] Park J H.Crustal Velocity Structure of the Southern Korean Peninsula Using 3-D Seismic Tomography,in School of Earth and Environmental Sciences.2006,Seoul:Seoul National University,154
[17] Chough S K,Kwon S T,Ree J H,et al.Tectonic and sedimentary evolution of the Korean peninsula:a review and new view.Earth-Science Reviews,2000,52:175～235
[18] Sheehan A F,Abers G A,Jones C H,et al.Crustal thickness variations across the Colorado Rocky Mountains from teleseismie receiver functions.Journal of Geophysical Research,1995,100(B10) :20391～20404
[19] Zelt B C,Ellis R M.Receiver-function studies in the Trans-Hudson Orogen,Saskatchewan.Canadian Journal of Earth Sciences,1999,36:585～603
[2] Ree J H,Cho M,Kwon S T,et al.Possible eastward extension of Chinese collision belt in South Korea:The Imjingangbelt.Geology,1996,24(12) :1071～1074
[3] Chang E Z.Collisional orogene between north and south China and its eatern extension in the Korean Peninsula.Journal of Southeast Asian Earth Sciences,1996,13 (3-5) :267～277
[4] Ishiwatari A,Tsujimori T.Paleozoic ophiolites and blueschists in Japan and Russian Primorye in the tectonic framework of East Asia:A synthesis.The Island Arc,2003,12:190～206
[5] 郝天珧,徐亚,胥颐等.对黄海-东海研究区深部结构的一些新认识.地球物理学报,2006,49(2) :405～416 Hao T,Xu Y,Xu Y,et al.Some new understandings on the deep structure in Yellow Sea and east China Sea.Chinese J.Geophys.,2006,49(2) :405～416
[6] 胥颐,李志伟,Kim K H,等.黄海的地壳速度结构与中朝-扬子块体拼合边界.地球物理学报,2009,52(3) :646～652 Xu Y,Li Z,Kim K H,et al.Crustal velocity structure and collision boundary between the Sino-Korea and Yangtze blocks in the Yellow Sea.Chinese J.Geophys.(in Chinese),2009,52(3) :646～652
[7] Langston C A.Structure under mount Rainier,Washington,inferred from teleseismic body waves.Journal of Geophysical Research,1979,83(B9) :4749～4762
[8] Cassidy J F.Numerical experiments in broadband receiver function analysis.Bulletin-Seismological Society of America,1992,82(3) :1453～1474
[9] Randall G E.Efficient calculation of differential seismograms for lithospheric receiver functions.Geophysical Journal International,1989,99:469～481
[10] 刘启元,Kind R,李顺成.中国数字地震台网的接收函数及其 非线性反演.地球物理学报,1998,40(3) :373～385 Liu Q Y,Kind R,Li S C,Receiver function at the stations of the Chinese digital seismic network (CDSN) and their nonlinear inversion.Chinese J.Geoph ys.(in Chinese),1998,40(3) :373～385
[11] Owens T J,Taylor S R,Zandt.Crustal structure at Regional Seismic Test Network stations determined from inversion of broadband teleseismic P waveforms.Bulletin-Seismological Society of America,1987,77(2) :631～662
[12] Ammon C J.The isolation of reciever effects from teleseismic P waveforms.Bulletin-Seismological Society of America,1991,81:2504～2510
[13] 刘启元,Kind R,李顺成.接收函数复谱比的最大或然性估计及非线性反演.地球物理学报,1996,39:531～543 Liu Q Y,Kind R,Li S C.Maximal likelihood estimation and nonlinear inversion of the complex receiver function spectrum ratio.Chinese J.Geophys.(in Chinese),1996,39:531～543
[14] Kim K H,Chiu J M,Kao H,et al.A Preliminary Study of Crustal Structure in Taiwan Region Using Receiver Function Analysis.Geophysical Journal International,2004,159:146～164
[15] Kennett B L N,Engdahl E R.Traveltimes for global earthquake location and phase identification.Geophysical Journal International,1991,105:429～465
[16] Park J H.Crustal Velocity Structure of the Southern Korean Peninsula Using 3-D Seismic Tomography,in School of Earth and Environmental Sciences.2006,Seoul:Seoul National University,154
[17] Chough S K,Kwon S T,Ree J H,et al.Tectonic and sedimentary evolution of the Korean peninsula:a review and new view.Earth-Science Reviews,2000,52:175～235
[18] Sheehan A F,Abers G A,Jones C H,et al.Crustal thickness variations across the Colorado Rocky Mountains from teleseismie receiver functions.Journal of Geophysical Research,1995,100(B10) :20391～20404
[19] Zelt B C,Ellis R M.Receiver-function studies in the Trans-Hudson Orogen,Saskatchewan.Canadian Journal of Earth Sciences,1999,36:585～603
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