Tomographic images of the P and S velocity perturbation, averaged vertically over the deepest 1000 km of the mantle, reveal structures with vertical continuity over that depth range. Negative (reddish) anomalies indicate the presence of lower mantle plumes.
For a table of all plumes in Montelli et al. (2006), see this table of mantle plumes.
Reference: Montelli, R., G. Nolet, F.A. Dahlen and G. Masters, A catalogue of deep mantle plumes: new results from finite-frequency tomography, Geochem. Geophys. Geosyst. (G3), 7, Q11007, doi:10.1029/2006GC001248, 2006.