Vertical motions of the Puerto Rico Trench and Puerto Rico and their cause


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dc.contributor.author ten Brink, Uri S.
dc.date.accessioned 2005-12-29T17:17:55Z
dc.date.available 2005-12-29T17:17:55Z
dc.date.issued 2005-06-22
dc.identifier.citation Journal of Geophysical Research 110 (2005): B06404 en
dc.identifier.uri http://hdl.handle.net/1912/358
dc.description This paper is not subject to U.S. copyright. Published in 2005 by the American Geophysical Union. The definitive version was published in Journal of Geophysical Research 110 (2005): B06404, doi:10.1029/2004JB003459. en
dc.description.abstract The Puerto Rico trench exhibits great water depth, an extremely low gravity anomaly, and a tilted carbonate platform between (reconstructed) elevations of +1300 m and −4000 m. I argue that these features are manifestations of large vertical movements of a segment of the Puerto Rico trench, its forearc, and the island of Puerto Rico that took place 3.3 m.y. ago over a time period as short as 14–40 kyr. I explain these vertical movements by a sudden increase in the slab's descent angle that caused the trench to subside and the island to rise. The increased dip could have been caused by shearing or even by a complete tear of the descending North American slab, although the exact nature of this deformation is unknown. The rapid (14–40 kyr) and uniform tilt along a 250 km long section of the trench is compatible with scales of mantle flow and plate bending. The proposed shear zone or tear is inferred from seismic, morphological, and gravity observations to start at the trench at 64.5°W and trend southwestwardly toward eastern Puerto Rico. The tensile stresses necessary to deform or tear the slab could have been generated by increased curvature of the trench following a counterclockwise rotation of the upper plate and by the subduction of a large seamount. en
dc.format.extent 3365513 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher American Geophysical Union en
dc.relation.uri http://dx.doi.org/10.1029/2004JB003459
dc.subject Dynamic topography en
dc.subject Slab tear en
dc.subject Puerto Rico trench en
dc.subject Caribbean plate en
dc.subject Challenger Deep en
dc.subject Seamount subduction en
dc.title Vertical motions of the Puerto Rico Trench and Puerto Rico and their cause en
dc.type Article en
dc.identifier.doi 10.1029/2004JB003459

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