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Toward Seeing the Earth's Interior Through Unbiased Tomographic Lenses
Author(s) -
Zaroli Christophe,
Koelemeijer Paula,
Lambotte Sophie
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl074996
Subject(s) - inverse theory , inversion (geology) , covariance , inverse problem , tomography , geodesy , focus (optics) , amplitude , inverse , tomographic reconstruction , mathematics , algorithm , geology , computer science , mathematical analysis , physics , optics , geometry , statistics , seismology , tectonics , surface wave
Abstract Geophysical tomographic studies traditionally exploit linear, damped least squares inversion methods. We demonstrate that the resulting models can be locally biased toward lower or higher amplitudes in regions of poor data illumination, potentially causing physical misinterpretations. For example, we show that global model S40RTS is locally biased toward higher amplitudes below isolated receivers where raypaths are quasi‐vertical, such as on Hawaii. This leads to questions on the apparent low‐velocity structure interpreted as the Hawaii hot spot. We prove that a linear Backus‐Gilbert inversion scheme can bring the Earth's interior into focus through unbiased tomographic lenses, as its model estimates are constrained to be averages over the true model. It also efficiently computes the full generalized inverse required to infer both model resolution and its covariance, enabling quantitative interpretations of tomographic models.