I don't know how many SPQ Hubbers are interested in this geology stuff, but here's an interesting paper on the types of technical results to expect from the Aeroquest survey presently being done over The Ring of Fire. I don't think the VTEM technology is too dissimilar from the TDEM being used at McFauld's.
http://www.earth2006.org.au/papers/extendedpdf/Ken%20Witherly-the%20vtem-extended.pdf
It is a short paper with some interesting Canadian case studies. The technical terms are numerous, so beware.
Snug