Abstract
We propose a Luneburg lens for focusing the seismic Rayleigh waves composed of blind holes with varying radii in a semi-infinite soil substrate. Luneburg lenses have a broadband property of achieving a focusing effect from 6 Hz to 9 Hz. It can enhance the wave amplitude by almost 4 times at the focus, and concentrate about 71% of the incident seismic wave energy in the focal area. And its FWHM can reach a minimum of 0.7λ. The effect of wavefront conversion of the Luneburg lens from a cylindrical wave to a plane wave is effectively demonstrated.
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