Scientists used a network of thousands of seismic measurement devices in the largest geological study of its kind, detecting the enormous blob upwelling under Vermont, New Hampshire, and Massachusetts – and possibly elsewhere.
Buried in two years of data, the team zeroed in on New England, having previously identified a thermal anomaly that was hundreds of degrees Celsius hotter than its surroundings in the upper mantle about 200 kilometres (124.2 miles) below the surface, and measuring approximately 400 kilometres (248.5 miles) in diameter.
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Seismic evidence for a recently formed mantle upwelling beneath New England, by Vadim Levin, Maureen D. Long, Peter Skryzalin; Yiran Li, Ivette López. Geology (2017) 46 (1): 87-90. https://doi.org/10.1130/G39641.1
