# Translations:Coherence - book/25/en

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Where is semblance used? It is used to obtain the velocity spectrum (Taner and Koehler, 1969^{[1]}). Schemes for velocity estimation based on the velocity spectrum are in widespread use today. The common-midpoint (CMP) gathers allow determination of root-mean-square velocities. Hyperbolic searches for semblance among the gathers form the basis on which velocities can be estimated. Measured semblances are presented as a velocity spectrum. The interpretation of this information then gives velocity estimates for both primary and multiple events.

- ↑ Taner, M. T., and F. Koehler, 1969, Velocity spectra-digital computer derivation and applications of velocity functions: Geophysics,
**34**, 859–881.