青藏高原大地水准面异常的解释与场源效应初探
摘要
在正常地球椭球或球体的情况下,其内外异常质量引起的大地水准面(异常)的表达式已推导出来,从而可以决定该面是在正常地球之内,抑或其外,由此推得高原处的大地水准面应在其外(正值),而青藏高原的大地水准面却在?30m左右.为什么会有这样大的负异常?该大地水准面有什么特征?它们由哪些场源组成的?主要和其他的异常源的贡献有多大?本文根据地震波速及地形、重力等资料对此作了较深入探讨和解释,分析表明五个方面场源的总效应与EGM-96的结果相近.
引文
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2方剑,许厚泽.中国及邻区大地水准面异常的场源深度探讨.地球物理学报,2002,45:42–48
3陆洋,许厚泽.青藏地区大地水准面形态及其与内部构造动力学关系.地球物理学报,1996,39:203–207
4方剑,许厚泽.全球地幔密度异常及其构造意义.测绘学报,2000,29:6–20
5张赤军,任康.由扰动位确定核幔起伏.地球物理学报,1994,37:115–119
6Hager B H,Richard M.A Long-wavelength variations in Earths geoid physical models and dynamical implications.Philos Trans R Soc A-Math Phys Eng Sci,1989,328:309–327
7Turcotte D L,Schubert G.Geodynamics:Applications of Continuum Physics to Geological Problems.New York:John Wiley and Sons,1982
8张赤军,方剑.西藏与南亚大地水准面异常源及其动力效应.地球物理学报,1997,40(增刊):112–118
9冷伟,傅容珊,黄建华,等.大地水准面异常和非洲下地幔异常体的结构.大地测量与地球动力学,2006,26:63–69
10柯小平.青藏高原地壳结构的重力正反演研究.博士学位论文.武汉:中国科学院测量与地球物理研究所,2006
11Jimenez-Munt I,Ferenandze M,Verges J,et al.Lithosphere structure underneath the Tibetan Plateau inferred from elevation,gravity and geoid anomalies.Earth Planet Sci Lett,2008,267:276–289
12陈胜早.青藏高原-北印度洋地区的均衡大地水准面异常和岩石圈构造.大地构造与成矿学,1992,16:367–378
13徐果明,姚华建,朱良保,等.中国西部及其邻域地壳上地幔横波速度结构.地球物理学报,2007,50:193–208
14滕吉文.固体地球物理.北京:地震出版社,2003
15孙岩昧,张中杰,滕吉文,等.青藏高原物质侧向流动的讨论—面波层析成像的证据.见:张中杰,主编.中国大陆地球深部结构与动力学研究.北京:科学出版,2004.872–880
16陈赞,张中杰,胡家富,等.青藏高原及邻区Love波速度横向展布特征.见:张中杰,主编.中国大陆地球深部结构与动力学研究.北京:科学出版,2004.773–782
17中国岩石圈动力学图集编委会.中国岩石圈动力学图集.北京:地震出版社,1991
18Heiskanen W A,Moritz M.Physical Geodesy.San Francisco:W.H.Free Man Company,1967
19Yijerison H.Potential Theory and its Applications in Earth’s Shape Theory and Geophysics(in Russia).Moscow:Print and Editorial Department of Science and Technique in U.S.S.R,1936
20傅容珊,阵凌,黄建华,等.全球地震层析地幔横向不均匀及大陆动力学.地球物理学进展.1995,10:51–62
21Verzhbitsky E V,Lobokovsky L Y.On the mechanism of heating up of the Indo-Australian plate.J Geodyn,1993,17:27–38
22Majymdaar T J,Krishna K S,Chatterjee S,et al.Study of high-resolution satellite geoid and gravity dada over the Bay of Bengal.J Current Sci,2006,90:1–4
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