Abstract
Summary Non-uniqueness bounds for shear velocity in the upper and lower mantle have been derived by Monte Carlo inversion, with constraints imposed by the data of Nuttli, Robinson & Kovach, and Hales & Roberts. The depth to the lower major discontinuity in the upper mantle is estimated to be 690 ± 25 km. Depths calculated for the corresponding discontinuity for compressional velocity are shallower than this, mainly as a result of differences in the interpretation of later arrivals in the travel-time data. Models of Hales & Roberts and Robinson & Kovach fall within our bounds for the lower mantle but the Fairborn mean model is excluded for depths greater than 2200 km.
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