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利用波数-频率积分法(F-K方法)合成不同震中距、不同方位角的三分量加噪理论地震图,之后采用小生境遗传算法对上述波形进行地壳速度结构的反演,探讨了震中距、方位角及单路径和多路径反演对反演结果的影响。研究表明,运用不同震中距和方位角所合成理论地震图进行波形反演其结果并无明显差异,说明震中距和方位角对波形反演方法的影响很小。尽管单路径反演和多路径反演均能得到较为准确的反演结果,但多路径的反演结果的准确性明显优于单路径。基于小生境遗传算法的波形反演方法是一种十分有效的求取区域一维速度结构的方法,可以为地震定位、震源矩张量反演及精细速度结构反演等研究提供基础资料,具有一定的实用价值。
Three-component and noise-theoretic seismograms with different epicentral distances and different azimuth angles were synthesized by wave number-frequency integral method (FK method). Then the niche velocity was retrieved by using niche genetic algorithm, and the relationship between epicenter distance, azimuth The Influence of Angle, Single Path and Multi - path Inversion on the Result of Inversion. The results show that there is no significant difference in the waveform inversion using the theoretical seismograms synthesized with different epicenter distances and azimuths, which shows that the epicenter distance and azimuth have little effect on the waveform inversion. Although both single-path inversion and multi-path inversion can obtain more accurate inversion results, the accuracy of multi-path inversion is obviously better than single path. The waveform inversion method based on niche genetic algorithm is a very effective way to get the one-dimensional velocity structure in the region. It can provide the basic data for seismic positioning, inversion of moment source tensor and fine velocity structure inversion, etc. Certain practical value.