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Gravitational Evidence for a Low-Density Mass beneath the Galapagos Islands
J E Case ; S L Ryl ; Tom Simkin ; K A Howard ;
Date:	14 Sep 1973
Journal:	Science, 181 (4104), 1040-1042
Abstract:	A residual negative free-air and Bouguer anomaly of at least 80 milligals, superimposed on a broader high, occurs over the Galápagos Islands The axis of the anomaly trends roughly east and plunges eastward. Thus, a low-density mass in the crust or upper mantle must underlie the archipelago. This anomaly may be caused by thermal expansion over a crust-mantle " hot spot".
Source:	PubMed, pmid17731263 doi: 10.1126/science.181.4104.1040
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