"It is established fact, however, that there is not any physically observed discontinuity between deep crust and upper mantle at around 100 km depth, and the continents are observed to have continuous mantle rock roots extending as deep as 600 km (Grand, 1987; Grand et al., 1997). So the question is naturally raised: How is it possible for the upper 100 km of a continent, e.g., North America, to move horizontally by several thousand kilometers at all, under any circumstances, when global seismic tomography data indicate deep continuous roots from the surface down to 600 km depth?" -- Stavros T. Tassos (seismologist) and David J. Ford (geologist), 2005
"Subduction leads to mythology." -- Me, noob, March 2009
Via Louis Hissink's Crazy World: Plate tectonics subducted. (Hat tip: Anaconda)
“This tomographic image alone,” says Choi, “is enough to bury the subduction models.”
