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Title

Along- and across-strike shallower structure of the subduction/collision zone in the northern Hispaniola margin

AuthorsRodríguez-Zurrunero, A.; Muñoz, Araceli; Gómez de la Peña, L. ; Llanes Estrada, Pilar
Issue Date18-Apr-2017
CitationSubduction Interface Processes Meeting (2017)
AbstractThe North American plate converges with the Caribbean plate at a rate of 20.0 ± 0.4 mm/yr. towards 254 ± 1º. Convergence is highly oblique (20-10º) to the plate boundary, resulting in along-strike segmentation, strain partitioning and microplate tectonics. From east to west, is taking place the transition from subduction in the Puerto Rico Trench, to subduction/collision in the Hispaniola Trench, and to left-lateral transpression in the northern Haitian margin. Series of large to great shallow interplate earthquakes occurred in the northern Hispaniola margin from 1943. These earthquakes have been attributed to the collision/subduction of the thick crust of the Bahamas Banks beneath the Caribbean plate. It should be noted the seismic crisis occurred 1943-1953 consisting in four events with M>7.0 and one with M8.1, and the large event occurred in 2003 with M6.4. At the end of 2013 the northern Hispaniola margin was systematically explored during the marine geophysical cruise NORCARIBE on board of the Spanish R/V Sarmiento de Gamboa. Data include swath bathymetry, grav-mag, chirp and MCS data. In this study we show preliminary results based on the combined interpretation of the NORCARIBE data of the shallower structure of the northern Hispaniola margin. This margin can be divided into three main morphotectonic provinces: The Bahama Banks, the Hispaniola Trench and the Northern Hispaniola Deformed Belt. This last province gathers most of active compression features being characterized by an along-strike segmented N-verging imbricated system built by series of active fault-propagation folds. Some of these faults are deep-rooted structures that could be involved in the earthquake nucleation. These preliminary results and further interpretation of deformational features will provide valuable information for the earthquake and tsunami assessment in the northern Hispaniola
DescriptionSubduction Interface Processes Meeting (SIP), An International Conference Zooming On Subduction Zones, 19-21 April 2017, Barcelona
URIhttp://hdl.handle.net/10261/177616
Appears in Collections:(ICM) Comunicaciones congresos
(IGEO) Comunicaciones congresos
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