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vol.60 suppl.3Geological and geotectonic framework of Isla del Coco and the marine zone off the central Pacific coast of Costa RicaMorphological features around Isla del Coco and its adjacent seamounts, Pacific Costa Rica índice de autoresíndice de assuntospesquisa de artigos
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Revista de Biología Tropical

versão On-line ISSN 0034-7744versão impressa ISSN 0034-7744


PROTTI, Marino; GONZALEZ, Víctor; FREYMUELLER, Jeffrey  e  DOELGER, Sarah. Isla del Coco, on Cocos Plate, converges with Isla de San Andrés, on the Caribbean Plate, at 78mm/yr. Rev. biol. trop [online]. 2012, vol.60, suppl.3, pp.33-41. ISSN 0034-7744.

Isla del Coco is the only land mass of the Cocos Plate that emerges above sea level. This makes it the only place where Cocos Plate motion can be measured using Global Navigation Satellite System (GNSS) monitoring. Global Positioning System (GPS) observations have been carried out sporadically over more than two decades on Isla del Coco, allowing precise measurement of the motion of the Cocos Plate. Recently, in May 2011, a continuous GPS station was built and instrumented at Isla del Coco, in Wafer Bay, by OVSICORI-UNA and UNAVCO, as part of the COCONet regional GNSS network. Position time series from this CGPS station (ISCO: Isla del Coco) show a steady motion of Isla del Coco at a speed of 90.9±1.5mm/yr in the N35oE direction in ITRF2008 and convergence with the Caribbean Plate at 78±1mm/yr. This result is consistent with the findings of the earliest GPS studies, and agrees within uncertainty with the estimated convergence rate of 76.4±x mm/ yr of the MORVEL plate motion model. MORVEL is based on an average over the last 780,000 years, and our result suggests that Cocos-Caribbean plate motions have been constant over that time interval. 

Palavras-chave : Isla del Coco; Cocos Plate; Caribbean Plate; GPS; continuous GPS (CGPS); plate motion.

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