区域性的地震面波层析方法
SEISMIC SURFACE WAVE TOMOGRAPHY IN A RECTANGULAR REGION
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摘要: 本文提出了一个利用平面上长方形区域內的面波频散资料,求区域的三维速度结构的方法。将地震波慢度表示成二重Fourier级数,反演其系数为深度的函数,最后合成速度值,并以Love面波为例作了数值计算试验,绘制出了深度为150km的速度平面分布图。
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关键词:
- 地震面波层析方法 /
- 面波频散资料 /
- 完备正交函数 /
- 二重Fourier级数展开 /
- 截取与合成
Abstract: This paper demonstrates a method of determining 3-D velocity structure by seismic surface wave dispersion in a rectangular region. The wave slowness is expressed by 2-fold Fourier series and the coefficients are determined by inversion as a function of depth. Finally, the velocity is synthesized. We have used this method and computed the velocity structure for Love surface waves. The velocity plane pattern of 150 km depth is mapped. -
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[1] Nakanishi, L, and D. L. Anderson, World distribution of group velocity of mantle Raylcigh waves as determined by spherical harmohic inversion, Bull. Seism. Snc Ann. 1982. 72. 1185——1194.
[2] Schwab, F. A., and L. Knopoff, Fast surface wave and Frce mode computations, Methods i; Computational Phycics, 1972. 11.87——180.
[3] Aki, K,and P. G. Richards, Quantitative Seismology, Chap. 7, 12, 1980, W. H. Freeman and Co.
[4] Wiggins, R. A., The general linear inverse problems implientions of surface wave and free oscillations for earth structure, Rev. Grophys. Space Phys., 1972, 10, 251——285.
[5] Natal, H. C., I. Nakanishi, and D. L. Anderson, Measurements of mantle wave velocities and inversion for lateral heterogencities and anisotropy, 3, Inversion, J. Crophys. Res..1986, 91. 87, 7261——7307.
[6] Montagher, J. P., Regional three——dimensional structures using long——period surface waves, Ann. Geophy 1986, 4. B, 283——294.[1] Nakanishi, L, and D. L. Anderson, World distribution of group velocity of mantle Raylcigh waves as determined by spherical harmohic inversion, Bull. Seism. Snc Ann. 1982. 72. 1185——1194.
[2] Schwab, F. A., and L. Knopoff, Fast surface wave and Frce mode computations, Methods i; Computational Phycics, 1972. 11.87——180.
[3] Aki, K,and P. G. Richards, Quantitative Seismology, Chap. 7, 12, 1980, W. H. Freeman and Co.
[4] Wiggins, R. A., The general linear inverse problems implientions of surface wave and free oscillations for earth structure, Rev. Grophys. Space Phys., 1972, 10, 251——285.
[5] Natal, H. C., I. Nakanishi, and D. L. Anderson, Measurements of mantle wave velocities and inversion for lateral heterogencities and anisotropy, 3, Inversion, J. Crophys. Res..1986, 91. 87, 7261——7307.
[6] Montagher, J. P., Regional three——dimensional structures using long——period surface waves, Ann. Geophy 1986, 4. B, 283——294.
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