用瑞利面波资料反演中国大陆东部地壳上地幔横波速度的三维构造
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摘要
利用中国大陆东部２１个台站的４３条面波大圆路径上瑞利面波记录的双台资料， 计算出双台间地震面波相速度频散，采用Ｔａｒａｎｔｏｌａ概率反演的方法求得相速度频散曲线的分 布，并由各处相速度频散曲线反演得到地壳上地幔的三维横波波速图像，进而得到中国东部 地壳上地幔的Ｓ波速度结构．结果表明：我国大陆东部地壳厚度总体上呈东薄西厚的趋势，以 １０５°Ｅ为界向西地壳厚度逐渐加深到５５ｋｍ以上，其中有一个北东向的ｈ形地壳厚度的坡度 带．豫西及晋南地区为相对薄地壳的地区．大别山地区和泰山附近地区地壳变厚，但秦岭地 区地壳不变厚．上地幔低速层上界面的深度在华北地区较浅，为８０—９０ｋｍ，在鄂尔多斯、四 川东部以及黔湘地区为１２０—１３０ｋｍ．扬子地块东部及华南褶皱系中、东部上地幔顶部速度 偏低使低速层的速度反差不明显．滇黔褶皱系的西部在２００ｋｍ以内的上地幔中未出现低速层。
The phase velocity dispersion of seismic surface waves have been calculated on the basis of clear and reliable Rayleigh wave records of the 21 seismic stations and 43 paths in east continental China. A distribution of phase velocity dispersion is obtained by Talantola probability inverse method. The image of the distribution of 3-D shear wave velocity in the crust and mantle is inverted by the phase velocity dispersion curves in the researched area. Then we obtain the S velocity structure in the cruse and mantle of east continental China. The results show that the overall tendency of the thickness of east China crust is thin in the east and thick in the west. To the west of 105°E, thickness of the crust gradually increases to 55km. There is an 'h' form slope belt of the crust thickness. The crust is relatively thin in west Henan province and south Shanxi province. The thickness of the crust beneath Dabie mountain and Tat mountain is thicker than surrounding area. But the crust is not thicker beneath Qin mountain (Qinlin). In North China the top interface of the low velocity layer of the upper mantle is rather shallow. It is about 80-90km. In the area of Eerduosi depression, Sichuan syneclise and Guizhou-Hunan area it is about 120- 130km. In the east Yangtze block as well as middle and South China Folding System velocity in the top upper mantle is relatively low and the velocity contrast of low velocity layer is not evident. In the west of Yunnan--Guizhou folding system there is no low velocity layer within the top 200km of the upper mantle.
The phase velocity dispersion of seismic surface waves have been calculated on the basis of clear and reliable Rayleigh wave records of the 21 seismic stations and 43 paths in east continental China. A distribution of phase velocity dispersion is obtained by Talantola probability inverse method. The image of the distribution of 3-D shear wave velocity in the crust and mantle is inverted by the phase velocity dispersion curves in the researched area. Then we obtain the S velocity structure in the cruse and mantle of east continental China. The results show that the overall tendency of the thickness of east China crust is thin in the east and thick in the west. To the west of 105°E, thickness of the crust gradually increases to 55km. There is an 'h' form slope belt of the crust thickness. The crust is relatively thin in west Henan province and south Shanxi province. The thickness of the crust beneath Dabie mountain and Tat mountain is thicker than surrounding area. But the crust is not thicker beneath Qin mountain (Qinlin). In North China the top interface of the low velocity layer of the upper mantle is rather shallow. It is about 80-90km. In the area of Eerduosi depression, Sichuan syneclise and Guizhou-Hunan area it is about 120- 130km. In the east Yangtze block as well as middle and South China Folding System velocity in the top upper mantle is relatively low and the velocity contrast of low velocity layer is not evident. In the west of Yunnan--Guizhou folding system there is no low velocity layer within the top 200km of the upper mantle.
引文
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[12]陈颖,陈运泰.晋中南地区地壳结构的初步研究.地球物理学报,1974,17(3);186-199.CHEN Yong, CHEN Yun-Tai. Preliminary results of the investigation of the crustal structure of thesouth--central part of Shanxi province. Chinese J Geophys. (in Chinese), 1974, 17(3): 186--199.
[13]姚振兴.临汾盆地地壳界面的反射波和地壳结构.地球物理学报,1974,17(4):237—246.YAO Zhen-Xing. Reflected waves from the M discontinuity and the stature of the Lin Fen basin. ChineseJ Geophys. (in Chinese), 1974, 17(4):237--246.
[14]袁学诚,左愚,蔡学林等.华南板块岩石圈构造与地球物理.见:八十年代中国地球物理学进展—纪念傅承义教授八十寿辰.北京:学术期刊出版社,1989,243—249YUAN Xue--Cheng, ZUO Yu CAI Xue--Lin, et al. The structure of the lithosphere and the geophysics inthe South China Plate. In: Geophysics in China on the Eighties --in Commemoration of the 80thBirthday of Professor FU Chen--Yi (in Chinese). Beijing: Academia Book and Periodical mss, 243--249.
[15]郝天珧,刘伊克,段昶.中国东部及其邻域地球物理场特征与大地构造意义,地球物理学报,1997,40(5):677—689.HAO Tian-Yao, LIU Yi-Ke, Duan Chang. The characteristic of geophysical field in the fort China andadjacent regions and its tectonics significance. Chinese J Geophys. (in Chinese), 1997, 40(5):677--689.
[16]冯锐,郑治真.对华北岩石圈的综合研究.科学通报,1987,32(22):1723-1727.FENG Rui, ZHENG Zhi-Zhen. Comprehensive study in lithosphere structure beneath North China. ChineseScience Bulletin (in Chinese), 1987, 32(22): 1723--1727.
[17] Tarantola A. Inverse Problem Theory--Method for Data Fitting and Model Parameter Estimation. ElsevierScience Publishers B V, 1987.
[18] Tarantola A, Nereessian A. Three-dimensional inversion without blocks. J. Geophys. Res., 1984, 76(2):299-306.
[19] Aki K, Richards P G. Quantitative Seismology-Theory and Methods. San Francisco: W.R Freeman and company 1980.
[20] Birch F. Composition of earth's mantle. Geophys. J Astr. Soc., 1961, 4(2):295-311.
[2]宋仲和,陈国英,安昌强等.中国大陆及其海域地壳-上地幔三维速度结构.中国科学(B),1993,23(2);180-188.SONG Zhong-He, CHEN Guo-Yin, AN Chang-Qiang. The 3--D structure of crust and mentle in ContinentalChina and adjacent seas. Science in China (B) (in Chinese), 1993, 23(2): 180--188.
[ 3]宋仲和,陈国英,安昌强等.中国东部及其相邻海域 S波三维速度结构.地球物理学报, 1992,35(3); 316-329.SONG Zhong-He, CHEN Guo-Yin, AN Chang-Qiang, et al. The 3--D shear wave velocity stricture beneaththe Eastern China and its adjacent seas. Chinese J Geophys. (in Chinese). 1992, 35(3):316--329.
[4]陈国英,宋仲和,安昌强等.华北地区三维地壳上地幔结构.地球物理学报,1991,34(2):172—181.CHEN Guo-Yin, SONG Zhong-He, AN Chang-Qiang, et al. Three dimensional crust and upper mantlestructure of the north China region. Chinese J. Geophys. (in Chinese), 1991, 34(2): 172--181.
[5]陈立华,宋仲和,安昌强等.中国南北带地壳上地幔三维面波速度结构和各向异性.地球物理学报,1992, 35(5):574—583.CHEN Li-Hua, SONG Zhong-He, AN Chang-Qiang, et al. Three dimensional shear wave velocity andanisotropy of crust and upper mantle in the China North--South Earthquake Belt. Chinese J Geophys (inChinese), 1992, 35(5):574--583.
[ 6]刘福田,曲克信,吴华等.中国大陆及其邻近地区的地震层析成像.地球物理学报, 1989,32(3):281—291.LIU Fu-Tian, QU Ke-Xin, WU Hua et al. Seismic tomography of the Chinese Continent and adjacentregion. Chinese J. Geophys. (in Chinese), 1989, 32(3):281--191.
[ 7]刘福田,刘建华.体波地震层析成像,见:袁学诚主编.中国地球物理图集.北京:地质出版社, 1996,174— 175.LIU Fu-Tian, LIU Jian-Hua. Seismic tomography by body waves. In: YUAN Xue-Cheng ed. Geophsicalmaps of China (in Chinese). Beijing: Geological Publishing House, 1996, 174--175.Chinese), 1991, 34(6):708-716.
[8]孙若昧,刘福田,刘建华.四川地区的地震层析成像.地球物理学报,1991,34(6):708-716.SUNRuo-Mei,LIU Fu-Tian,Liu jian-Hua. Seismic tomography of Sichuan. ChineseJ Geophys in
[9]朱介寿,严忠琼,姚宇峰.莫霍界面深度图.见:袁学诚主编.中国地球物理图集.北京:地质出版社,1996,176—177.ZHU Jie-Shou, Yan Zhong-Qiong, YAO Yu-Feng. In: YUAN Xue-Cheng ed. Map of the depth of Mohointerface. Geophsical maps of China(in Chinese). Beijing: Geological Publishing House, 1996, 176--177.
[10]徐果明,李跃,李光品等.关于区域性的地震面波层析反演方法的讨论.地球物理进展,1994,9(2):43—53.XU Guo-Ming, LI Yue, LI Guang-Pin. Discussion concerning with tomographyic inversions of seismicsurface waves, Progress in Geophysics (in Chinese), 9(2):41--53.
[11]曾融生,孙为国,毛桐恩等.中国大陆莫霍界面深度图.地震学报,1995,17(3):322—327.ZHEN Rong-Shen, Sun Wei-Guo, Mao Tong-En, et al. The depth of Moho in the mainland of China. ActaSeismologica Sinica (in Chinese), 1995, 17(3):322--327.
[12]陈颖,陈运泰.晋中南地区地壳结构的初步研究.地球物理学报,1974,17(3);186-199.CHEN Yong, CHEN Yun-Tai. Preliminary results of the investigation of the crustal structure of thesouth--central part of Shanxi province. Chinese J Geophys. (in Chinese), 1974, 17(3): 186--199.
[13]姚振兴.临汾盆地地壳界面的反射波和地壳结构.地球物理学报,1974,17(4):237—246.YAO Zhen-Xing. Reflected waves from the M discontinuity and the stature of the Lin Fen basin. ChineseJ Geophys. (in Chinese), 1974, 17(4):237--246.
[14]袁学诚,左愚,蔡学林等.华南板块岩石圈构造与地球物理.见:八十年代中国地球物理学进展—纪念傅承义教授八十寿辰.北京:学术期刊出版社,1989,243—249YUAN Xue--Cheng, ZUO Yu CAI Xue--Lin, et al. The structure of the lithosphere and the geophysics inthe South China Plate. In: Geophysics in China on the Eighties --in Commemoration of the 80thBirthday of Professor FU Chen--Yi (in Chinese). Beijing: Academia Book and Periodical mss, 243--249.
[15]郝天珧,刘伊克,段昶.中国东部及其邻域地球物理场特征与大地构造意义,地球物理学报,1997,40(5):677—689.HAO Tian-Yao, LIU Yi-Ke, Duan Chang. The characteristic of geophysical field in the fort China andadjacent regions and its tectonics significance. Chinese J Geophys. (in Chinese), 1997, 40(5):677--689.
[16]冯锐,郑治真.对华北岩石圈的综合研究.科学通报,1987,32(22):1723-1727.FENG Rui, ZHENG Zhi-Zhen. Comprehensive study in lithosphere structure beneath North China. ChineseScience Bulletin (in Chinese), 1987, 32(22): 1723--1727.
[17] Tarantola A. Inverse Problem Theory--Method for Data Fitting and Model Parameter Estimation. ElsevierScience Publishers B V, 1987.
[18] Tarantola A, Nereessian A. Three-dimensional inversion without blocks. J. Geophys. Res., 1984, 76(2):299-306.
[19] Aki K, Richards P G. Quantitative Seismology-Theory and Methods. San Francisco: W.R Freeman and company 1980.
[20] Birch F. Composition of earth's mantle. Geophys. J Astr. Soc., 1961, 4(2):295-311.
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