On evanescent wave field retrieval with the Marchenko method in 2D settings

We show the capability of the Marchenko method to retrieve not only propagating waves, but also evanescent waves, based on a recent derivation of the Marchenko method that does not depend on up-down decomposition inside the medium of interest. We show how these wave fields can be easily retrieved in...

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Bibliographic Details
Published in:arXiv.org 2023-04
Main Authors: Brackenhoff, Joeri, Wapenaar, Kees
Format: Article
Language:English
Subjects:
Evanescent waves
Retrieval
Time domain analysis
Wave propagation
Online Access:Get full text
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Summary:We show the capability of the Marchenko method to retrieve not only propagating waves, but also evanescent waves, based on a recent derivation of the Marchenko method that does not depend on up-down decomposition inside the medium of interest. We show how these wave fields can be easily retrieved in the slowness-intercept-time domain and what the wave fields look like when they are transformed back to the space-time domain. It is vital for the retrieval of the coda of the wave field that the initial estimate of the focusing function is a direct arrival that contains both the up-going and down-going component of the evanescent wave field. This is because these events directly overlay each other in time.
ISSN:2331-8422