对于简正波，运用高效数值方法解频散方程，提高了简正波的计算精确和速度。

To obtain accurate normal modes quickly, the frequency dispersion equation was solved by an efficient numerical algorithm.

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解释时根据深地震测深和面波频散层析成像的结果，用二维模型进行正演拟合。

According to the results of the deep seismic sounding and surface wave dispersion tomography, a two-dimensional model is used to do the match in the interpretation.

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接着，简要介绍了基于声波高阶差分的多次波正演模拟方法，分析了这种方法的数值频散问题，包括时间和空间频散，同时给出了它的稳定性条件。

Then the article discusses forward modeling based on acoustic wave higher difference, then analyzes numerical dispersion including time and spatial dispersion and presents its stability conditions.

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接着，简要介绍了基于声波高阶差分的多次波正演模拟方法，分析了这种方法的数值频散问题，包括时间和空间频散，同时给出了它的稳定性条件。

Then the article discusses forward modeling based on acoustic wave higher difference, then analyzes numerical dispersion including time and spatial dispersion and presents its stability conditions.

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