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| Salas y Gómez Ridge | |
|---|---|
| Name | Salas y Gómez Ridge |
| Location | Southeast Pacific Ocean |
| Coordinates | 26°S 105°W (approx.) |
| Country | Chile (EEZ vicinity of Easter Island) |
| Type | Submerged volcanic ridge |
| Length | ~2,000 km |
Salas y Gómez Ridge The Salas y Gómez Ridge is a long, submarine volcanic ridge in the southeast Pacific Ocean near Easter Island, the Nazca Plate, and the Peru–Chile Trench, situated between Tahiti and South America. The ridge links a chain of seamounts and guyots including Easter Island and Salas y Gómez Island, and is associated with hotspot volcanism, plate tectonics, and Pacific biogeographic dispersal corridors. Its setting intersects research by institutions like the Smithsonian Institution, National Oceanic and Atmospheric Administration, University of Hawaii, Universidad de Chile, and international programs such as the Census of Marine Life.
The ridge extends east–west across the southeast Pacific near the East Pacific Rise, traversing abyssal plains adjacent to the Atacama Trench and the continental margin of Chile. Features along the ridge include submerged seamounts, guyots, coral pinnacles, and volcanic cones connected to Easter Island, Salas y Gómez Island, Pukao, and other features charted by expeditions from the HMS Challenger era to modern ROV surveys. Geologic mapping from institutions such as the Scripps Institution of Oceanography and the Instituto Oceanográfico de la Armada de Chile documents basaltic lava flows, pillow basalts, and carbonate caps shaped by erosion and subsidence influenced by the Cocos Plate boundary and nearby fracture zones like the Easter Fracture Zone.
Formation of the ridge is linked to the Easter hotspot track, interactions between the Nazca Plate and the Pacific Plate, and propagation of the East Pacific Rise spreading center, with contributions from ridge–hotspot interaction models developed by researchers at California Institute of Technology and Massachusetts Institute of Technology. Radiometric dating techniques such as argon–argon dating applied by teams from Geological Society of America and the US Geological Survey reveal a temporal progression of volcanism consistent with hotspot motion relative to the Nazca Plate. Plate reconstructions using data from the International Union of Geological Sciences and paleomagnetic studies from laboratories at Institut de Physique du Globe de Paris and University of Oxford indicate seamount ages increasing eastward toward South America, reflecting plume–plate kinematics also invoked for chains like the Hawaiian–Emperor seamount chain.
Ecologically the ridge provides stepping-stones for marine species dispersal across the central and southeast Pacific, linking biogeographic provinces studied by the IUCN, World Wildlife Fund, and regional researchers at Pontificia Universidad Católica de Chile. Habitats include deep-sea coral gardens, sponges, hydrozoans, and benthic invertebrates surveyed by teams from NOAA Fisheries, Monterey Bay Aquarium Research Institute, and the National Museum of Natural History (France). Pelagic species such as tuna, sharks, seabirds including Sooty Tern, and migratory marine mammals like humpback whale and sperm whale utilize the ridge as feeding or migratory habitat, a pattern documented in tagging studies by Oregon State University and the Institute of Marine Research (Norway). Endemic and regionally restricted taxa have been described by taxonomists affiliated with the Natural History Museum, London, Museo Nacional de Historia Natural (Chile), and the California Academy of Sciences.
European charting and naming of islands near the ridge involved voyages by explorers and navigators such as Gonzalo Fernández de Oviedo, Ferdinand Magellan era chroniclers, and later hydrographic surveys by the French Hydrographic Office and the British Admiralty. Scientific exploration accelerated during the 19th and 20th centuries with expeditions like HMS Challenger, the German Deep Sea Expedition (Valdivia), and postwar research cruises sponsored by National Geographic Society, Scripps Institution of Oceanography, and the US Navy. Archaeological and ethnographic work linking Rapa Nui (Easter Island) cultural history to wider Pacific voyaging was conducted by scholars from University of Cambridge, University of Auckland, and Pontificia Universidad Católica de Chile, while modern oceanographic campaigns used research vessels such as RV Tangaroa, RV Voyager, and RV Falkor equipped with multibeam sonar and remotely operated vehicles.
The ridge falls largely within the exclusive economic zone claimed by Chile around Easter Island and adjacent high-seas areas, implicating international law instruments like the United Nations Convention on the Law of the Sea and proposals under the Convention on Biological Diversity. Conservation initiatives include the creation of marine protected areas influenced by efforts from Chile's National Fisheries Service (SERNAPESCA), Oceana, Greenpeace, and academic advocacy from University of Oxford researchers. Proposals for large-scale protection akin to the Papahānaumokuākea Marine National Monument have been debated in forums involving the Ministry of Foreign Affairs (Chile), National Commission for the Rapa Nui People, and international NGOs such as The Pew Charitable Trusts.
Ongoing research integrates deep-sea ecology, volcanology, and oceanography performed by consortia including the Census of Marine Life, Global Ocean Observing System, and university groups from University of Hawaiʻi at Mānoa, University of Washington, and Universidad de Concepción. Monitoring uses technologies like multibeam bathymetry, autonomous underwater vehicles developed by WHOI and MBARI, genetic barcoding in collaboration with the Barcode of Life Data System, and remote sensing from satellites operated by NASA and the European Space Agency. International collaborations through bodies such as the Scientific Committee on Oceanic Research and publications in journals like Nature, Science, and Deep-Sea Research continue to refine knowledge of seamount connectivity, endemism patterns, and anthropogenic impacts including fisheries interactions documented by FAO.
Category:Seamounts of the Pacific Ocean Category:Volcanic ridges Category:Geography of Easter Island