Segmentation and kinematics of the North America-Caribbean plate boundary offshore Hispaniola



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Leroy, Sylvie and Ellouz-Zimmermann, N. and Corbeau, J. and Rolandone, F. and Mercier de Lépinay, B. and Meyer, B. and Momplaisir, R. and Granja Bruña, Jose Luis and Battani, A. and Baurion, C. and Burov, E. and Clouard, V. and Deschamps, R. and Gorini, C. and Hamon, Y. and Lafosse, M. and Leonel, J. and Le Pourhiet, L. and LLanes Estrada, Pilar and Loget, N. and Lucazeau, F. and Pillot, D. and Poort, J. and Tankoo, K.R. and Cuevas, J.L. and Alcaide, J.F. and Poix, C.J. and Muñoz Martín, Alfonso and Mitton, S. and Rodriguez, Y. and Schmitz, J. and Seeber, L. and Carbó Gorosabel, Andrés and Muñoz, S. (2015) Segmentation and kinematics of the North America-Caribbean plate boundary offshore Hispaniola. Terra Nova, 27 . pp. 467-478. ISSN 1365-3121

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We explored the submarine portions of the Enriquillo–Plantain Garden Fault zone (EPGFZ) and the Septentrional–Oriente Fault zone (SOFZ) along the Northern Caribbean plate boundary using high-resolution multibeam echo-sounding and shallow seismic reflection. The bathymetric data shed light on poorly documented or previously unknown submarine fault zones running over 200 km between Haiti and Jamaica (EPGFZ) and 300 km between the Dominican Republic and Cuba (SOFZ). The primary plate-boundary structures are a series of strike-slip fault segments associated with pressure ridges, restraining bends, step overs and dogleg offsets indicating very active tectonics. Several distinct segments 50–100 km long cut across pre-existing structures inherited from former tectonic regimes or bypass recent morphologies formed under the current strike-slip regime. Along the most recent trace of the SOFZ, we measured a strike-slip offset of 16.5 km, which indicates steady activity for the past ~1.8 Ma if its current GPS-derived motion of 9.8 ± 2 mm a−1 has remained stable during the entire Quaternary.

Item Type:Article
Subjects:Sciences > Geology
Sciences > Geology > Geodynamics
ID Code:35637
Deposited On:30 Nov 2016 11:43
Last Modified:30 Nov 2016 12:00

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