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Marine Geophysical Researches

, Volume 31, Issue 4, pp 263–283 | Cite as

Gravity modeling of the Muertos Trough and tectonic implications (north-eastern Caribbean)

  • J. L. Granja Bruña
  • A. Muñoz-Martín
  • U. S. ten Brink
  • A. Carbó-Gorosabel
  • P. Llanes Estrada
  • J. Martín-Dávila
  • D. Córdoba-Barba
  • M. Catalán Morollón
Original Research Paper

Abstract

The Muertos Trough in the northeast Caribbean has been interpreted as a subduction zone from seismicity, leading to infer a possible reversal subduction polarity. However, the distribution of the seismicity is very diffuse and makes definition of the plate geometry difficult. In addition, the compressive deformational features observed in the upper crust and sandbox kinematic modeling do not necessarily suggest a subduction process. We tested the hypothesized subduction of the Caribbean plate’s interior beneath the eastern Greater Antilles island arc using gravity modeling. Gravity models simulating a subduction process yield a regional mass deficit beneath the island arc independently of the geometry and depth of the subducted slab used in the models. This mass deficit results from sinking of the less dense Caribbean slab beneath the lithospheric mantle replacing denser mantle materials and suggests that there is not a subducted Caribbean plateau beneath the island arc. The geologically more realistic gravity model which would explain the N–S shortening observed in the upper crust requires an overthrusted Caribbean slab extending at least 60 km northward from the deformation front, a progressive increase in the thrusting angle from 8° to 30° reaching a maximum depth of 22 km beneath the insular slope. This new tectonic model for the Muertos Margin, defined as a retroarc thrusting, will help to assess the seismic and tsunami hazard in the region. The use of gravity modeling has provided targets for future wide-angle seismic surveys in the Muertos Margin.

Keywords

Caribbean plate Muertos Trough Gravity modeling Retroarc thrusting 

Notes

Acknowledgments

We are in debt to the Captain, officers, and crew of the R/V Hespérides and the technicians of the Unidad de Tecnología Marina and the U. S. Geological Survey for their professional help at sea. This work has been supported by the Spanish Ministry of Education and Science (leaded by Andrés Carbó-Gorosabel and Diego Córdoba-Barba; Projects REN2003-08520-C02-01, CTM2006-13666-C02-01 and complementary action REN2002-12855-E/MAR), the U.S. Geological Survey Coastal and Marine Program, and the Puerto Rico Seismic Network. J. L. Granja was funded with a doctoral grant from the Spanish Ministry of Education and Science. We also want to thank the Dirección General de Minería of Dominican Republic for providing the onshore gravity data. We also thank to the anonymous reviewers for their constructive comments and suggestions.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • J. L. Granja Bruña
    • 1
  • A. Muñoz-Martín
    • 1
  • U. S. ten Brink
    • 2
  • A. Carbó-Gorosabel
    • 1
  • P. Llanes Estrada
    • 1
  • J. Martín-Dávila
    • 4
  • D. Córdoba-Barba
    • 3
  • M. Catalán Morollón
    • 4
  1. 1.Applied Tectonophysics Group, Departamento de GeodinámicaUniversidad Complutense de MadridMadridSpain
  2. 2.United States Geological SurveyWoods HoleUSA
  3. 3.Departamento de Física de la Tierra y Astrofísica IUniversidad Complutense de MadridMadridSpain
  4. 4.Real Instituto y Observatorio de la Armada, San FernandoSan Fernando-(Cádiz)Spain

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