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Author

Shijun Cheng

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#artificial intelligence Preprint Oct 2026

Depth-progressive 3D seismic velocity model building via 2D generative diffusion models

A depth-progressive framework that achieves 3D VMB using 2D generative diffusion models through a depth-as-channel formulation, in which the depth dimension of each 3D velocity patch is mapped to the channel dimension of a 2D U-Net, which effectively propagates shallow velocity priors downward and produces high-quality...

Shi-Jun Cheng, R. Harsuko, M. Taufik et al. · 0 citations
Preprint Sep 2026

Shallow-to-deep velocity model building via diffusion models-Part II: Realistic scenarios

Full-waveform inversion (FWI) requires accurate initial velocity models to avoid cycle-skipping, but constructing such models remains challenging in practice. Building on the depth-progressive diffusion framework introduced in Part~I, which relied on idealized reflectivity constraints, this work adapts the methodology...

Shi-Jun Cheng, R. Harsuko, T. Alkhalifah · 0 citations
Jul 2026

Generative wave propagator

A conditional diffusion-based wavefield propagator that advances seismic wavefields recursively from one time step to the next, conditioned by a short history of recent wavefield time steps, the velocity model, and the wavefield time step index is introduced.

Shi-Jun Cheng, T. Alkhalifah · 0 citations

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