论文标题
Astroseis-不规则的小行星和身体中的地震波场的3D边界元素建模代码
AstroSeis -- A 3D Boundary element modeling code for seismic wavefields in irregular asteroids and bodies
论文作者
论文摘要
我们开发了一个称为Astroseis的3-D弹性边界元素方法（BEM）计算机代码，以模拟具有任意形状（例如小行星）体内的地震波场。除了Astroseis可以处理任意的表面地形外，它还可以在小行星模型中处理液体。在我们当前的代码中，固体和液体域都是同质的。对于地震来源，我们可以使用单力或力矩张量。 Astroseis在频域中实现，并且可以很容易地合并频率依赖性Q。该代码位于MATLAB中，很容易设置模型以运行我们的代码。频域计算是研究由于循环力而导致的天体的长期弹性响应，例如潮汐力，而没有数值分散问题，而其他许多其他需要体积网络的方法则遭受了数值分散问题。我们的Astroseis已通过其他方法（例如普通模式求和）和直接解决方案方法（DSM）进行了基准测试。该开源Astroseis将是研究小行星内部和表面过程的有用工具。
We developed a 3-D elastic Boundary Element Method (BEM) computer code, called AstroSeis, to model seismic wavefields in a body with an arbitrary shape, such as an asteroid. Besides the AstroSeis can handle arbitrary surface topography, it can deal with a liquid core in an asteroid model. Both the solid and liquid domains are homogenous in our current code. For seismic sources, we can use single forces or moment tensors. The AstroSeis is implemented in the frequency domain and the frequency-dependent Q can be readily incorporated. The code is in MATLAB and it is straightforward to set up the model to run our code. The frequency-domain calculation is advantageous to study the long-term elastic response of a celestial body due to a cyclic force such as the tidal force with no numerical dispersion issue suffered by many other methods requiring volume meshing. Our AstroSeis has been benchmarked with other methods such as normal modes summation and the direct solution method (DSM). This open-source AstroSeis will be a useful tool to study the interior and surface processes of asteroids.
