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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Structured regularization based velocity structure estimation in local earthquake tomography for the adaptation to velocity discontinuities

Fig. 1

Schematic diagrams of the penalty terms used in the proposed method. a Vertical-direction penalty. The sum of the second-order velocity differences among adjacent layers of depth is penalized. b Horizontal-direction penalty. The first-order velocity differences among adjacent grid points on the same layer are penalized. The central grid point in this figure has four adjacent grid points

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