What is it about?
The seismic imaging of subsurface structures in diffuse and highly scattering media such as crystalline rock environments is challenging and many conventional techniques fail to delineate relevant and important features. We propose a strategy that, in contrast to other works, is not based on the conventionally utilized reflected energy, but rather builds on the diffracted energy emanating from the subsurface.
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Why is it important?
Owing to their overall brittleness, crystalline rocks are often heavily fractured, which lets recorded seismic wave fields appear noisy and incoherent. By specifically tailoring our processing to diffracted contributions, a simple focusing strategy helps to shed light on features that could previously not be observed with conventional, reflection-based processing.
Perspectives
Diffraction is expected to significantly contribute to the often complicated seismic wave fields recorded in crystalline environments. I view the presented work as a first step, in which the overall feasibility of dedicated diffraction imaging in crystalline rocks is investigated. Based on our impressions, I am optimistic that diffraction imaging will play an increasingly important role in such structurally complex crustal environments.
Dr Benjamin Schwarz
Fraunhofer Institute for Wind Energy Systems IWES
Read the Original
This page is a summary of: 3-D seismic imaging in crystalline rock environments: An approach based on diffraction focusing, Journal of Applied Geophysics, June 2019, Elsevier,
DOI: 10.1016/j.jappgeo.2019.04.003.
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