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首页> 外文期刊>Geophysical Research Letters >Discrete visco-elastic lattice methods for seismic wave propagation
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Discrete visco-elastic lattice methods for seismic wave propagation

机译:离散粘弹性格方法在地震波传播中的应用

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2D and 3D discrete particle or lattice methods for the simulation of seismic waves are presented for different visco-elastic media. It is demonstrated that a numerical implementation of the method is capable of modelling visco-elastic seismic wave propagation. Lattice methods represent the medium under investigation as particles or nodes interacting through local force rules. Three schemes are developed, a Maxwell body, a Kelvin-Voigt body and a Zener Body (or standard linear solid). The force acting between particles is chosen to represent each of these different rheologies. Each of these schemes was tested against analytical solutions for wave propagation in 2D and 3D unbounded visco-elastic media. The seismograms generated for each different rheology fit well with the expected theoretical seismograms with the maximum misfit error energy being less than 3% for each different rheology. As such, lattice methods offer an alternative approach to seismic wave modelling in elastic and visco-elastic media.
机译:针对不同的粘弹性介质,提出了用于地震波模拟的2D和3D离散粒子或晶格方法。证明了该方法的数值实现能够对粘弹性地震波传播进行建模。格子法将被研究的介质表示为通过局部力规则相互作用的粒子或节点。开发了三种方案,麦克斯韦体,开尔文-沃格体和齐纳体(或标准线性实体)。选择作用在颗粒之间的力来代表这些不同的流变性。这些方案中的每一个都针对在2D和3D无边界粘弹性介质中传播的解析解决方案进行了测试。为每种不同的流变学生成的地震图与预期的理论地震图非常吻合,对于每种不同的流变学,最大失配误差能量小于3%。这样,晶格方法为弹性和粘弹性介质中的地震波建模提供了另一种方法。

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