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| North Aegean Trough | |
|---|---|
| Name | North Aegean Trough |
| Location | Aegean Sea, northeastern Mediterranean |
| Type | Submarine trough |
| Basin countries | Greece; Turkey |
North Aegean Trough is a prominent submarine trough in the northeastern Aegean Sea within the Mediterranean Sea basin, lying between the Thrace and the North Aegean Islands near Lesbos, Chios, and Samos. The trough forms a major bathymetric depression that influences regional circulation linked to the Marmara Sea, the Dardanelles and the Bosporus. It has been the focus of marine surveys by institutions such as the Hellenic Centre for Marine Research, the Turkish Geological Survey, and international projects coordinated through the European Marine Observation and Data Network.
The trough extends along the northeastern Aegean margin from the vicinity of Thessaloniki and Drama southwards toward the island arc including Chios and Lesbos, skirting the continental shelves of Thrace and Marmara Province. Bathymetric mapping using multibeam echosounders from research vessels like RV Meteor and RV Pelagia reveals axial depths comparable to the deepest Aegean basins near Crete and the Hellenic Trench, with steep flanks adjacent to the continental slope of the Anatolian Plate and structural highs proximal to Lesbos Island and the Gökçeada region. Sediment cores recovered by teams from the University of Athens and Istanbul Technical University show layered turbidites correlated with events recorded off Saros Bay and the Gulf of İzmir.
The trough lies within a complex plate boundary zone involving the Aegean Sea Plate, the Anatolian Plate, and the wider Eurasian Plate margin, where slab rollback of the Hellenic Arc and back-arc extension have influenced basin evolution. Extension related to the southward retreat of the subducting slab beneath the Hellenic Trench and strike-slip partitioning along structures linked to the North Anatolian Fault and the Kozlu Fault have contributed to the trough's formation. Geophysical surveys including seismic reflection profiles by the British Geological Survey and seismic tomography studies affiliated with INGV and the GFZ German Research Centre for Geosciences document normal faulting, transform fault segments, and crustal thinning consistent with Miocene–Quaternary rifting seen in other basins like the Ionian Sea and the Levant Basin.
The region is seismically active, with instrumentally recorded earthquakes catalogued by the National Observatory of Athens, the Kandilli Observatory, and the European-Mediterranean Seismological Centre. Historical seismicity includes tsunamigenic events that affected ports such as Kavala, Thasos, and Çanakkale, and tie into broader seismic sequences like those associated with the 1912 Mitylene earthquake and the 1967 Greece earthquake episodes. Fault segments mapped beneath the trough show potential for moderate to large earthquakes; seismic hazard assessments used by civil authorities in Greece and Turkey integrate paleoseismic evidence from submarine landslides and slope failures documented near Samothrace and Lesbos.
Circulation in the trough is affected by exchanges through the Dardanelles, episodic outflow of lower-salinity waters from the Sea of Marmara, and interactions with the large-scale Mediterranean thermohaline structure described in studies by UNESCO programs and the National Oceanic and Atmospheric Administration. The trough funnels intermediate and deep water masses, including modified Eastern Mediterranean Deep Water, shaping vertical profiles of temperature and salinity measured by CTD casts from the Fisheries Research Institute and by floats from the Argo program. Seasonal and interannual variability is modulated by atmospheric forcing from systems such as the North Atlantic Oscillation and regional winds like the Etesian winds.
Bentho-pelagic habitats along the trough support assemblages documented by marine biologists at the Hellenic Centre for Marine Research, the Mediterranean Science Commission (CIESM), and regional universities. Faunal records include demersal fishes valued by fisheries from Mytilene and Ayvalık, cephalopods observed near Chios, and cold-water corals and sponge grounds on structural highs associated with islands such as Lesbos and Gökçeada. Biodiversity assessments reference species lists compiled by the International Union for Conservation of Nature and studies of invasive species pathways linked to shipping through the Dardanelles and ports like Thessaloniki.
The trough influences fisheries exploited by fleets based in Mytilene, Kavala, and Çanakkale and is traversed by commercial shipping routes connecting the Black Sea and the Mediterranean via the Bosporus. Hydrocarbon exploration in the broader Aegean and adjacent basins by companies working under licenses from the governments of Greece and Turkey has prompted environmental and geopolitical interest including input from the European Commission and regional ministries. Scientific cruises, cable-laying projects, and potential seabed mining discussions involve stakeholders such as the NATO maritime commands and academic consortia from University of Thessaloniki and Koç University.
Category:Aegean Sea Category:Submarine troughs