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伪谱法分离波动方程弹性波模拟

Keywords: 分离法波场模拟,一阶伪谱法,二阶伪谱法,交错网格,规则网格

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Abstract:

?本文在一阶分离波动方程的基础上,推导出了相应的二阶分离波动方程的简单形式。采用交错网格和常规网格伪谱法,实现了一阶及二阶波动方程波场p波和s波的分离模拟。同时对一阶、二阶波场分离模拟结果,以及分离法与非分离法模拟结果进行了对比研究。结果表明:一阶与二阶伪谱法分离的效果大致相当,一阶分离法在走时拾取上略占优势,但二阶分离法在振幅和子波形态保护及分离彻底性方面优势明显;实际计算中分离法比非分离法更为灵活多变。

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