Seismology utilizes the Vp/Vs ratio rather than Vs/Vp to characterize lithology and fluid content
Seismology and rock physics standardly rely on the compressional-to-shear velocity ratio (Vp/Vs) to characterize subsurface lithology, pore fluids, and gas saturation.
The retrieved literature extensively confirms that the Vp/Vs ratio is a fundamental parameter in seismology and rock physics for fluid identification, lithology discrimination, and monitoring subsurface changes. No papers suggest using Vs/Vp for this purpose.
Md. Iftekhar Alam, Priyank Jaiswal. Near Surface Characterization Using VP/VS and Poisson's Ratio from Seismic Refractions. 2017. https://doi.org/10.2113/jeeg22.2.101
Paper 0 utilizes the VP/VS ratio to successfully characterize near-surface lithology and locate underground utility pipes and voids.
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A. Masihi, T. Fischer. In-Situ Vp/Vs Ratio Variation in Seismic Swarms as Indicators of Magmatic Processes: Fagradalsfjall Volcanic Activity, SW Iceland. 2025. https://doi.org/10.1093/gji/ggaf122
Paper 1 uses the in-situ Vp/Vs ratio to monitor volcanic processes and fluid changes within seismic swarms.
De Landro G, Vanorio T, Muzellec T, Russo G, Lomax A, Virieux J, Zollo A. 3D structure and dynamics of Campi Flegrei enhance multi-hazard assessment.. 2025. https://doi.org/10.1038/s41467-025-59821-z
Paper 2 combines 3D P- and S-wave seismic images to analyze the caldera's structure and fluid-pressure reservoirs.
S. J. Omovie. Novel Method for Estimating Water Saturation in Gas Reservoirs Using Acoustic Log P-Wave and S-Wave Velocities. 2024. https://doi.org/10.30632/spwla-2024-0123
Paper 3 utilizes acoustic log P-wave and S-wave velocities to model the lower velocity ratio in gas reservoirs for fluid and saturation identification.
Fawad M, Mondol NH. Monitoring geological storage of CO<sub>2</sub> using a new rock physics model.. 2022. https://doi.org/10.1038/s41598-021-04400-7
Paper 5 demonstrates that CO2 plume delineation, saturation, and pressure changes can be estimated using the P- to S-wave velocity ratio (Vp/Vs).
El Hateel MS, El Sayed AMA, El-Werr AK, Abdel-Hady A. Probabilistic 3D lithology classification from elastic property volumes an advanced inversion workflow at Desouq Gas Field, West Nile Delta, Egypt.. 2026. https://doi.org/10.1038/s41598-026-42888-z
Paper 7 discusses pre-stack simultaneous inversion enabling the estimation of Vp/Vs to link seismic inversion to rock physics evaluation.
Mahdy A, Helmi A, Helaly AS, Mahmoud AME. A physics-driven workflow for gas-sand identification in Pliocene turbidites using pre-stack inversion and seismic attributes, offshore Egypt.. 2026. https://doi.org/10.1038/s41598-025-31461-9
Paper 8 uses rock-physics-guided cross-plotting of Vp/Vs versus P-impedance for robust lithology and fluid discrimination.
Leisi A, Shad Manaman N. Seismic and geomechanical characterization of Asmari formation using well logs and simultaneous inversion in an Iranian oil field.. 2025. https://doi.org/10.1038/s41598-025-95796-z
Paper 11 calculates the Vp/Vs ratio from well logs and simultaneous inversion to perform lithological facies discrimination and fluid detection.
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