  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.
