Muertos Trough

Muertos Trough
Name	Muertos Trough
Location	Caribbean Sea
Type	Trough
Basin countries	Dominican Republic, Haiti

Muertos Trough is an elongate tectonic depression located beneath the northern Caribbean Sea adjacent to the island of Hispaniola. It lies offshore the Dominican Republic and Haiti and forms part of the complex plate boundary zone between the North American Plate and the Caribbean Plate. The trough influences regional Hispaniola coastal geology, affects seismic hazard for Santo Domingo, Port-au-Prince, and neighboring Caribbean capitals, and has been a focus of marine geophysical surveys by institutions such as the United States Geological Survey and the Woods Hole Oceanographic Institution.

Geology and Tectonic Setting

The trough occupies a position within the boundary system that includes the Septentrional Fault Zone, the Timuay Fault, and the Enriquillo-Plantain Garden Fault Zone, reflecting transpressional and transtensional interactions between the North American Plate and the Caribbean Plate. Regional association with the Greater Antilles island arc and proximity to the Puerto Rico Trench place it within a network of fracture zones, subduction-related structures, and accretionary complexes. Bathymetric and gravity anomalies detected by surveys from the National Oceanic and Atmospheric Administration and the Lamont–Doherty Earth Observatory indicate crustal thinning and a sedimentary basin morphology comparable to other pull-apart basins like the Dead Sea basin and the Gulf of California basins. Tectonic models invoking strike-slip partitioning and oblique convergence have been applied by researchers at the Smithsonian Institution and the American Geophysical Union.

Stratigraphy and Sedimentology

Sediment cores and seismic reflection profiles obtained during expeditions by the RRS James Cook partners and the NOAA Ship Okeanos Explorer reveal Pleistocene to Holocene sequences of turbidites, hemipelagites, and carbonate-rich deposits. Lithostratigraphic sections correlate with onshore stratigraphy in the Dominican Republic including the Cibao Valley and the Cordillera Septentrional sediments. Provenance studies referencing detrital zircon populations and geochemical fingerprints conducted by groups at the University of Miami and the California Institute of Technology link terrigenous input to erosion from the Sierra de Neiba and the Massif de la Selle. High-resolution seismic facies analysis by teams publishing in Geology and Marine Geology indicates episodes of rapid sedimentation associated with earthquakes recorded in historical catalogs maintained by the International Seismological Centre.

Seismicity and Geohazards

The trough region exhibits seismicity cataloged alongside major events such as the 1690 Hispaniola earthquake and the 2010 Haiti earthquake, with instrumentally recorded tremors analyzed by the Incorporated Research Institutions for Seismology and the Global Seismographic Network. Fault interaction between the trough structures and onshore faults contributes to rupture propagation scenarios studied by researchers at the Southern California Earthquake Center and the European Seismological Commission. Tsunami modeling groups at the Pacific Tsunami Warning Center and the Atlantic and Gulf of Mexico Tsunami Warning System have simulated wave generation from potential submarine landslides and seismic sources within the basin, informing coastal preparedness for ports like Santo Domingo and Jacmel. Geohazard mitigation efforts have engaged agencies including the Pan American Health Organization and national disaster offices of the Dominican Republic.

Natural Resources and Hydrocarbon Potential

Geochemical sampling and seismic stratigraphic interpretation by exploration teams in the Caribbean petroleum community, including analysts from Petrobras-era studies and independent firms, suggest the trough holds conventional sedimentary sequences favorable for hydrocarbon maturation analogous to plays offshore Trinidad and Tobago and the Gulf of Mexico. Reports prepared with input from the United Nations Development Programme and the Inter-American Development Bank discuss energy potential and exploration risks for national entities like the State Oil Company of the Dominican Republic and regional utilities. Methane seep indicators and authigenic carbonate mounds imaged with remotely operated vehicles from institutions such as the Institut Français de Recherche pour l'Exploitation de la Mer point to active fluid migration systems comparable to those studied off Norway and New Zealand.

Research History and Exploration

Scientific attention to the trough dates from early hydrographic charts produced by the British Admiralty and subsequent marine campaigns by the United States Navy and the French Bureau of Mines. Modern geophysical investigations have been led by consortia including the National Research Council (US) panels, academic teams from the University of Puerto Rico, and international collaborations presented at meetings of the American Association of Petroleum Geologists and the Society for Sedimentary Geology (SEPM)]. Key datasets derive from multichannel seismic reflection, bathymetric mapping with multibeam echosounders on research vessels like the RV Atlantis, and coring programs using platforms supported by the National Science Foundation.

Environmental and Ecological Impact

The interplay of tectonics, sedimentation, and hydrocarbon seepage shapes benthic habitats studied by marine biologists from the Smithsonian Tropical Research Institute and conservation groups such as Conservation International. Cold-seep communities, chemosynthetic assemblages, and deepwater coral frameworks documented in the region are compared with analogs from the Gulf of Mexico and the Barents Sea. Environmental assessments by the World Wildlife Fund and the United Nations Environment Programme stress the implications of potential exploration activities for fisheries supporting communities in Haiti and the Dominican Republic, and call for integrated management involving the Caribbean Community and the Organisation of Eastern Caribbean States.

Category:Geology of the Caribbean Category:Oceanic troughs