Multiples and surface waves can give us extra views of the subsurface compared with just one view from primaries. As an example, surface waves in a layered medium are an interference pattern of up- and down-going multiple reflections, body-wave reflections and converted S-to-P events for Rayleigh waves and SS for Love waves. Just like the rearview mirror in our cars, images from multiple reflections can give us a much more comprehensive view of the subsurface. This special section is devoted to showing how these extra looks at the subsurface can provide significant upgrades to subsurface characterization. The characterization can be...

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