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| Mona Canyon | |
|---|---|
| Name | Mona Canyon |
| Caption | Bathymetric map of the Caribbean region with the canyon area |
| Location | Caribbean Sea, between Puerto Rico and Hispaniola |
| Type | Submarine canyon |
| Length | ~180 km |
| Max-depth | >3,600 m |
| Countries | United States (via Puerto Rico), Dominican Republic |
Mona Canyon Mona Canyon is a major submarine canyon in the Caribbean Sea that lies between the islands of Puerto Rico and Hispaniola. It connects the shallow Mona Passage and the Mona Shelf to the deep waters of the Puerto Rico Trench and the North Atlantic Ocean, forming a key bathymetric feature influencing regional ocean currents and marine ecosystems. The canyon is geopolitically significant to Puerto Rico and the Dominican Republic and has been the focus of scientific studies by institutions such as the United States Geological Survey, the Smithsonian Institution, and the Institut Français de Recherche pour l'Exploitation de la Mer.
The canyon is situated off the west coast of Puerto Rico near the island of Mona Island and the Mona Passage, bordering waters adjacent to the southwest coast of Puerto Rico and the northern coast of the Dominican Republic on Hispaniola. Its head lies near the Mona Rift and the Mona Shelf, while its base merges into the basin of the Puerto Rico Trench, close to features such as the Anegada Trough and the Leeward Antilles. Nautical charts produced by the National Oceanic and Atmospheric Administration and bathymetric maps from the NOAA Office of Ocean Exploration and Research show its steep walls, tributary gullies, and channels extending toward the Atlantic Ocean and the Caribbean Plate margins.
The canyon formed along the boundary between the Caribbean Plate and the North American Plate, influenced by tectonic processes linked to the Puerto Rico Trench and the Muertos Trough. Its geomorphology reflects activity related to the Cretaceous-to-Cenozoic tectonic evolution of the northeastern Caribbean, with sedimentary strata that include Paleogene carbonates and Neogene siliciclastic deposits. Geological surveys by the USGS and academic teams from institutions like the University of Puerto Rico and the University of Miami have documented mass-wasting events, turbidite sequences, and canyon incision associated with episodes recorded in the regional stratigraphic record tied to events such as the Great Antilles arc accretion. Radiometric dating and seismic reflection profiles correlate canyon growth with plate boundary slip rates and paleoseismicity along structures related to the Muertos Trough system.
Mona Canyon channels energetic currents and acts as a conduit for water exchange between the Mona Passage, the Caribbean Sea and the North Atlantic Ocean. Oceanographers from the Woods Hole Oceanographic Institution and the Lamont–Doherty Earth Observatory have measured strong along-canyon flows, internal waves, and down-canyon turbidity currents that transport organic matter and sediments to the Puerto Rico Trench basin. The canyon modulates characteristics of the North Equatorial Current-influenced waters, affecting salinity and temperature distributions recorded by profiling floats deployed by the Argo program and CTD casts from research vessels of the NOAA Ship Ronald H. Brown. Seasonal variability linked to the Atlantic hurricane season and interannual oscillations such as the Atlantic Multidecadal Oscillation influence hydrodynamic regimes within the canyon.
Mona Canyon hosts diverse benthic and pelagic communities, with habitats ranging from continental-shelf-associated coral and sponge assemblages near the canyon head to deep-sea cold-water corals, xenophyophores, and chemosynthetic-associated fauna in the abyssal reaches. Marine biologists affiliated with the Smithsonian Tropical Research Institute, the University of Puerto Rico at Mayagüez, and the Scripps Institution of Oceanography have recorded species of reef-building corals, gorgonians, demersal fishes, cephalopods, and deep-sea crustaceans, alongside migratory cetaceans such as sperm whale and humpback whale occurrences in adjacent waters. The canyon also supports commercially important species whose life cycles involve canyon-associated nursery and feeding grounds, making it relevant to studies by the National Marine Fisheries Service and regional fisheries bodies like the Caribbean Fisheries Management Council.
Human engagement with the canyon spans indigenous navigation by Taíno people across the Mona Passage to colonial-era shipping routes used by Spanish Empire galleons and later by transatlantic and Caribbean merchant vessels linked to ports such as San Juan, Puerto Rico and Santo Domingo. Modern scientific exploration increased during the 20th and 21st centuries with expeditions by the NOAA, the Monterey Bay Aquarium Research Institute, and international collaborations including teams from Spain and France. Submersible dives, remotely operated vehicle surveys, multibeam bathymetry, and seismic studies have been conducted using platforms like the RV Atlantis and ROVs such as those operated by the Woods Hole Oceanographic Institution, producing detailed maps and biological inventories used by researchers at the University of the West Indies and the Marine Biological Laboratory.
The canyon region is seismically active due to strain accumulation along the Puerto Rico Trench and nearby faults associated with the boundary between the Caribbean Plate and the North American Plate, with historical earthquakes recorded by the United States Geological Survey and regional seismic networks. The geomorphic setting favors submarine landslides and turbidity currents that can generate tsunamis impacting coasts of Puerto Rico and the Dominican Republic, a risk assessed in hazard studies by the Federal Emergency Management Agency and the Intergovernmental Oceanographic Commission. Notable seismic events affecting the broader region, such as earthquakes recorded in the 18th, 19th, and 20th centuries, inform contemporary tsunami preparedness programs coordinated by entities including the Caribbean Disaster Emergency Management Agency.
Category:Submarine canyons Category:Geography of Puerto Rico Category:Geography of the Dominican Republic