With the Marchenko method, Green’s functions in the subsurface can be retrieved from seismic reflection data at the surface. State-of-the-art Marchenko methods work well for propagating waves but break down for evanescent waves. This paper discusses a first step towards extending the Marchenko method for evanescent waves and analyses its possibilities and limitations. In theory both the downward and upward decaying components can be retrieved. The retrieval of the upward decaying component appears to be very sensitive to model errors, but the downward decaying component, including multiple reflections, can be retrieved in a reasonably stable and accurate way. The reported research opens the way to develop new Marchenko methods that can handle refracted waves in wide-angle reflection data.

中文翻译：

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渐逝波的马尔琴科方法

使用 Marchenko 方法，可以从地表的地震反射数据中检索出地表下的格林函数。最先进的 Marchenko 方法适用于传播波，但会分解为渐逝波。本文讨论了扩展渐逝波的 Marchenko 方法的第一步，并分析了它的可能性和局限性。理论上，可以检索向下和向上衰减的分量。向上衰减分量的反演似乎对模型误差非常敏感，但向下衰减分量，包括多次反射，可以以相当稳定和准确的方式反演。报告的研究为开发新的马尔琴科方法开辟了道路，该方法可以处理广角反射数据中的折射波。