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the claim

Seismic travel times differ based on factors other than distance.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Seismic travel times are influenced by structural heterogeneities, composition, and temperature variations within the Earth's interior, meaning they depend on factors other than distance alone.

The analysis

The retrieved papers consistently demonstrate that seismic travel times and wave speeds vary due to internal structural heterogeneities, lateral velocity variations, thermal anomalies, and compositional differences in the Earth's mantle and core, directly supporting the claim.

Evidence for · 4
Imaging the Mediterranean upper mantle by p- wave travel time tomography
Recorded source metadata

C. Piromallo, A. Morelli. Imaging the Mediterranean upper mantle by p- wave travel time tomography. 1997. https://doi.org/10.4401/AG-3890

P-wave travel times show strong lateral variations associated with structural heterogeneity in the crust and mantle.

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More for · 3
Lateral heterogeneity in the upper mantle beneath the Tibetan plateau and its surroundings from SS‐S travel time residuals
Recorded source metadata

I. G. Dricker, S. W. Roecker. Lateral heterogeneity in the upper mantle beneath the Tibetan plateau and its surroundings from SS‐S travel time residuals. 2002. https://doi.org/10.1029/2001jb000797

Differential travel times reveal upper mantle lateral heterogeneity and wave speed variations across the Tibetan plateau.

Thermal asymmetry in the Moon's mantle inferred from monthly tidal response.
Recorded source metadata

Park RS, Berne A, Konopliv AS, Keane JT, Matsuyama I, Nimmo F, Rovira-Navarro M, Panning MP, Simons M, Stevenson DJ, Weber RC. Thermal asymmetry in the Moon's mantle inferred from monthly tidal response.. 2025. https://doi.org/10.1038/s41586-025-08949-5

Monthly tidal response measurements demonstrate lateral variations in mantle elastic properties and internal structure.

Seismic low-velocity equatorial torus in the Earth's outer core: Evidence from the late-coda correlation wavefield.
Recorded source metadata

Ma X, Tkalčić H. Seismic low-velocity equatorial torus in the Earth's outer core: Evidence from the late-coda correlation wavefield.. 2024. https://doi.org/10.1126/sciadv.adn5562

Global coda correlation wavefields show systematic travel time and velocity variations in the outer core depending on wave paths.

The paper trail · every fact has a biography
first checked02 Aug 2026
judged → SUPPORTED · 8802 Aug 2026
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