The pioneering work of Jeffreys and Bullen (1940; JB Tables) established the first truly global seismological travel‐time tables, which have fulfilled a vital and important role in performing earthquake locations and seismic tomography. Such information has enriched our knowledge about the inner structure of the Earth and its dynamic processes. The JB travel‐time tables, which are based on 1D velocity model (radial dependence only), have gradually improved over the years through a series of modifications, for example, the PREM model (Dziewonski and Anderson, 1981), the IASP91 model (Kennett and Engdahl, 1991) and the AK135 model...

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