Seismic Phase Analysis Toolkit

Tools for analyzing, quantifying, and correcting seismic phase distortions in land seismic data, with emphasis on near-surface scattering effects, phase variability, and circular-statistics–based methods.

Overview

Seismic phase is highly sensitive to small-scale near-surface heterogeneities that scatter the wavefield and introduce trace-dependent distortions. These distortions degrade waveform coherence, stacking power, resolution, and effective bandwidth.

This repository provides algorithms and workflows for:

• Phase extraction in time and frequency domains
• Circular statistics for wrapped phase analysis
• Phase variability quantification
• Phase masking and stabilization
• Acquisition and processing quality control (QC)
• Visualization of phase behavior in prestack data

The toolkit is intended for research, acquisition QC, advanced processing, and development of new phase-based seismic attributes.

Publications

Journal Articles

• Rohatgi, A., Bakulin, A., Peterson, A. and Fomel, S., 2026, Reducing waveform variability in prestack seismic data using circular-statistics based phase masking: Geophysics, in preparation.

• Rohatgi, A., Bakulin, A., and Fomel, S., 2026, Phase variance as a seismic quality-control attribute: Geophysics, submitted. [Preprint]

• Rohatgi, A., Bakulin, A., and Fomel, S., 2025, Data-driven analysis of seismic phase using circular statistics: The Leading Edge, 44(9), 683–691. [Paper]

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Conference Papers & Expanded Abstracts

• Bakulin, A., Rohatgi, A., and Fomel, S., 2026, Taming Seismic Phase: From Statistical Characterization to Objective Phase Masking: 87th EAGE Annual Conference & Exhibition, 1–5.

• Rohatgi, A., Bakulin, A., and Fomel, S., 2025, Seismic phase spectral analysis: Field-data insights from circular statistics: International Meeting for Applied Geoscience & Energy (IMAGE), Expanded Abstracts, 44. [Paper]

• Rohatgi, A., Bakulin, A., and Fomel, S., 2025, Theory of seismic phase analysis using circular statistics: International Meeting for Applied Geoscience & Energy (IMAGE), Expanded Abstracts, 44. [Paper]

• Rohatgi, A., Bakulin, A., Fomel, S., and Badger, J., 2025, Impact of near-surface topography on reflection distortions: From diffractions to speckle noise: International Meeting for Applied Geoscience & Energy (IMAGE), Expanded Abstracts, 44. [Paper]

• Bakulin, A., Rohatgi, A., and Fomel, S., 2025, Statistical analysis of seismic phase variability in dense data: 86th EAGE Annual Conference & Exhibition, 1–5. [Paper]

• Rohatgi, A., Bakulin, A., and Fomel, S., 2024, Analyzing the impact of additive and multiplicative noise on seismic data analysis: SEG International Exposition and Annual Meeting, Expanded Abstracts, SEG-2024-4086176. [Paper]

• Rohatgi, A., Bakulin, A., and Fomel, S., 2024, Phase pilot recovery: A foundation for mitigating speckle scattering noise in seismic data: International Meeting for Applied Geoscience & Energy (IMAGE), Expanded Abstracts, 43. [Paper]