MAGIC and other Eastern US projects

MT data were collected along a line roughly coincident with the MAGIC seismic experiment.  Thick (>100km) lithosphere, cold dry material that is a poor conductor of electrical current, is seen at each end of the profile. But the lithosphere beneath the mountains in markedly thinner. We see evidence for a small amount of molten material (melt) below this thinned region and infer that the melt has eroded away the base of what was presumably a much thicker lithosphere in the past. Interestingly, the region of thinnest lithosphere sits just to the west of a region where there was a volcanic eruption some 50 million years ago.