2010 resurfacing in the research arena:
Schematic diagram of the Yellowstone plum progression relative to the North American plate. (a) Behind-arc plum-head phase located beneath the accreted oceanic plate of of the Columbia River Plateau and behind the descending Juan de Fuca plate at 17 Ma. (b) Sheared and tilted plume head entrained in mantle flow at present time. (c) Hypothesized track of the Yellowstone plume tail, at 660 km depth originating 150 km west of Yellowstone, to its origin as a tilted structure at 14 Ma 400 km southwest. Red circles show the plume base which is offset due to the tilt from surface silicic volcanic centers shown with yellow circles. Basaltic dikes are shown as dashed green lines. (Smith et al., 2009).
download the Seismic model: http://seismo.berkeley.edu/~rallen/research/dna/dna09/download/
March 2009 update:
CEMI consortium meeting / AGU slideshow
Paper found in Chapter 13 of manual.