Fourier forward modeling of vector and tensor gravity fields due to prismatic bodies with variable density contrast

Fourier forward modeling of vector and tensor gravity fields due to prismatic bodies with variable density contrast
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由于具有可变密度对比度的棱柱体而对矢量和张量重力场进行傅里叶正演建模

DOI:
10.1190/geo2014-0559.1
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发表时间:
2016
期刊:
影响因子:
3.3
通讯作者:
Chen Longwei
Chen Longwei
中科院分区:
地球科学2区
文献类型:
--
作者:
Wu Leyuan;Chen Longwei

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变密度对比度棱柱体在沉积盆地重力异常的模拟和反演中非常有用,其中一些简单的数学函数比常密度模型更能近似盆地充填的密度-深度关系。我们已经探讨了矢量和张量重力异常由于二维和三维棱柱体的傅立叶域建模下面的一个广泛的类的变密度函数。我们把重点放在一般的多项式模型,因为他们提供了一个灵活的方法来近似任意密度函数。最近提出的高斯快速傅里叶变换方法,以提高反傅里叶变换的精度。通过与空间域解析解、半数值解或完全数值解进行比较,检验了该方法的数值性能。对多项式密度模型的奇异性和数值稳定性进行了分析,给出了算法的数值稳定性范围。
ABSTRACTPrismatic bodies with variable density contrasts are very useful in modeling and inversion of gravity anomalies for sedimentary basins, in which some simple mathematical functions offer better approximations for the density-depth relationship of the basin fill than a constant density model. We have explored Fourier-domain modeling of vector and tensor gravity anomalies due to 2D and 3D prismatic bodies following a wide class of variable density functions. We placed the emphasis on general polynomial models because they provided a flexible way to approximate arbitrary density functions. The recently proposed Gauss-fast Fourier transform method was applied to improve the accuracy of inverse Fourier transform. The numerical performance of the presented method was examined by comparing with space-domain analytical, seminumerical, or completely numerical solutions. Singularity and numerical stability of the algorithm were also analyzed with ranges of numerical stability for polynomial density models of...
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