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本文给出一种适于2D非均匀介质中弹性波计算的二阶显式有限差分法。该算法以波动方程积分为基础,在网格离散化前采用了自由应力边界条件(穿过间断点)。文中采用了另一种零密度方案来代替自由界面边界条件。此方案是一阶的,并已证明是波动方
In this paper, a second-order explicit finite difference method suitable for elastic wave computation in 2D inhomogeneous media is given. The algorithm is based on the integral of the wave equation and uses a free-stress boundary condition (passing through the breakpoint) before mesh discretization. In this paper, another zero-density scheme is used instead of the free-boundary boundary conditions. This program is first-order and has proved to be a volatile side