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Gravitational Evidence for a Low-Density Mass beneath the Galápagos Islands

Case, J. E. and Ryland, S. L. and Simkin, Tom and Howard, K. A. (1973) Gravitational Evidence for a Low-Density Mass beneath the Galápagos Islands. Science, 181 (4104). pp. 1040-1042. ISSN 0036-8075. doi:10.1126/science.181.4104.1040.

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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".

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Additional Information:© 1973 American Association for the Advancement of Science. Received 4 May 1973; revised 26 June 1973. Partly supported by NSF grant GA-19308, NASA contract W 13, 130, and the Smithsonian Research Foundation. We wish to acknowledge the outstanding logistical support provided by Captain J. Fitter and crew of the yacht Bronzewing, Captain D. Balfour and crew of the Golden Cachelot, Captain B. Schreyer and crew of Beagle III, and the captain and crew of the Lina-A. J. Barnes assisted with the gravity survey in 1970, and M. Easton served as assistant during the 1971 traverse of Fernandina. R. F. Burmester, University of Missouri, provided a gravity meter for the 1973 work. W. A. Sniffen made terrain corrections. Helpful review was provided by R. G. Martin, Jr., H. Krivoy, and P. Rabinowitz. Publication authorized by the director, U.S. Geological Survey.
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NASAW 13, 130
Smithsonian Research FoundationUNSPECIFIED
Issue or Number:4104
Record Number:CaltechAUTHORS:20150729-124733831
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Official Citation:Gravitational Evidence for a Low-Density Mass beneath the Galápagos Islands J. E. Case, S. L. Ryland, Tom Simkin, and K. A. Howard Science 14 September 1973: 181 (4104), 1040-1042. [DOI:10.1126/science.181.4104.1040]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59064
Deposited By: Tony Diaz
Deposited On:29 Jul 2015 20:02
Last Modified:10 Nov 2021 22:14

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