English: Simplified and interpreted P- and S-wave velocity variations in the mantle across southern North America showing the subducted Farallon Plate. Adapted from Grand et al. (1997).[1]
↑Stephen P. Grand, Rob D. van der Hilst, Sri Widiyantoro (1997): Global Seismic Tomography: A Snapshot of Convection in the Earth. GSA Today 7(4):1–7 (PDF 2.7 MB)
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