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arXiv 2011.14484physics.geo-ph
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连续介质中地震波方程的解析解和数值解

Analytic and numerical solutions to the seismic wave equation in continuous media

S. J. Walters, L. K. Forbes, A. M. Reading

摘要:

本文介绍了两种模拟合成地震脉冲的方法,并对它们进行了比较。首先,在二维笛卡尔坐标系中建立了一个新的解析模式。与充分对称的初始条件相结合,这为下面的数值方法的有效性提供了有价值的检查。一个特定的初始条件,它允许一个新的封闭形式的解决方案。然后提出了一种数值方案,该方案结合了位移分量和波速参数的谱(傅里叶)表示、四阶龙格-库塔积分方法和吸收边界层。在新的软件实现中,在适当的增强性能的桌面硬件上并行求解所得到的大型微分方程系统。这为各向同性介质内的波的正演建模提供了一种替代方法,该方法是有效的,并且适合于建模地震结构中的快速和灵活的发展,例如,浅深度环境应用。的解析解和数值方案的视觉比较。

英文摘要:

This paper presents two approaches to mathematical modelling of a synthetic seismic pulse, and a comparison between them. First, a new analytical model is developed in two-dimensional Cartesian coordinates. Combined with an initial condition of sufficient symmetry, this provides a valuable check for the validity of the numerical method that follows. A particular initial condition is found which allows for a new closed-form solution. A numerical scheme is then presented which combines a spectral (Fourier) representation for displacement components and wave-speed parameters, a fourth order Runge-Kutta integration method, and an absorbing boundary layer. The resulting large system of differential equations is solved in parallel on suitable enhanced performance desktop hardware in a new software implementation. This provides an alternative approach to forward modelling of waves within isotropic media which is efficient, and tailored to rapid and flexible developments in modelling seismic structure, for example, shallow depth environmental applications. Visual comparisons of the analytic solution and the numerical scheme are presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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