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雷瑞波具有强振幅、低频和低速的特点,在反射地震勘探中通常是需要被压制的强噪声。本文研究如何利用雷瑞波获取近地表地层的横波速度和地下结构,选取萤火虫优化算法进行面波的反演,萤火虫优化算法是一种新的粒子群算法理论,具有稳定、快捷、全局搜索等特点。针对萤火虫优化算法优缺点进行了讨论和改进,通过对理论模型和野外数据的测试应用,将提取的瑞利面波频散曲线反演得到横波速度信息。结果表明萤火虫优化算法能实现面波非线性反演,并具有分辨率高、抗干扰能力强等优点和实际使用前景。
Rayleigh wave has the characteristics of strong amplitude, low frequency and low speed, in the reflection seismic exploration is usually need to be suppressed strong noise. In this paper, how to use Rayleigh wave to obtain the near-surface shear velocity and subsurface structure, select the firefly optimization algorithm for surface wave inversion, firefly optimization algorithm is a new particle swarm optimization theory, with a stable, fast, global search and so on . The advantages and disadvantages of firefly optimization algorithm are discussed and improved. Through the application of the theoretical model and field data, the shear wave velocity information is obtained by inverse of the Rayleigh wave dispersion curve. The results show that the firefly optimization algorithm can realize the non-linear inversion of surface wave and has the advantages of high resolution, strong anti-interference ability and practical application prospects.