A novel principle to localize the sensitivity of waveform tomography using wave interferences at the observation boundary

Journal Article (2021)
Author(s)

S. Minato (TU Delft - Applied Geophysics and Petrophysics)

R. Ghose (TU Delft - Applied Geophysics and Petrophysics)

Research Group
Applied Geophysics and Petrophysics
Copyright
© 2021 S. Minato, R. Ghose
DOI related publication
https://doi.org/10.1038/s41598-021-01199-1
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 S. Minato, R. Ghose
Research Group
Applied Geophysics and Petrophysics
Issue number
1
Volume number
11
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Abstract

When using waveform tomography to perform high-resolution imaging of a medium, it is vital to calculate the sensitivity in order to describe how well a model fits a given set of data and how the sensitivity changes with the spatial distribution of the heterogeneities. The traditional principle behind calculating the sensitivity—for detecting small changes—suffers from an inherent limitation in case other structures, not of interest, are present along the wave propagation path. We propose a novel principle that leads to enhanced localization of the sensitivity of the waveform tomography, without having to know the intermediate structures. This new principle emerges from a boundary integral representation which utilizes wave interferences observed at multiple points. When tested on geophysical acoustic wave data, this new principle leads to much better sensitivity localization and detection of small changes in seismic velocities, which were otherwise impossible. Overcoming the insensitivity to a target area, it offers new possibilities for imaging and monitoring small changes in properties, which is critical in a wide range of disciplines and scales.