DORMASIS

Type Oceanographic cruise
Ship L'Atalante
Ship owner Ifremer
Dates 22/04/1992 - 14/05/1992
Chief scientist(s) NEEDHAM Hubert David, AVEDIK Felix

GEO-OCEAN - UMR 6538

Univ. Brest, CNRS, Ifremer, Univ. Bretagne Sud

Place Nicolas Copernic

29280 Plouzané

https://www.geo-ocean.fr/
DOI 10.17600/92000411
Objective DORMASIS was a methodological, technical and scientific cruise. The objective was to explore whether, in the area around the crest of the mid-Atlantic ridge, there are seismic interfaces in the crust and at the crust-mantle transition. Nine days were spent in the zone. The seismic source was made up of the new GI (generator-injector) air guns recently purchased by Ifremer and was deployed, over most of the survey, following the single-bubble principle, aiming to focus the available energy on low frequencies (10-30 Hz). The total volume of the source was 17 litres (1,020 in3). Using the 96-channel streamer and a shot interval of approximately 50 metres, with ship's speed of 5 knots, provided 24-fold multiple coverage.

Data managed by SISMER

Bibliography

Publications

Pichot Thibaud, Patriat MartinORCID, Westbrook Graham, Nalpas T., Gutscher Marc-Andre, Roest WalterORCID, Deville E., Moulin M.ORCID, Aslanian DanielORCID, Rabineau MarinaORCID (2012). The Cenozoic tectonostratigraphic evolution of the Barracuda Ridge and Tiburon Rise, at the western end of the North America-South America plate boundary zone. Marine Geology, 303, 154-171. https://doi.org/10.1016/j.margeo.2012.02.001


Le Friant A, Boudon G, Deplus C, Villemant B (2003). Large-scale flank collapse events during the activity of Montagne Pelee, Martinique, Lesser Antilles. Journal Of Geophysical Research-solid Earth, 108(B1-2055), 1-15. https://doi.org/10.1029/2001JB001624


Avedik Felix, Hirn A, Renard Vincent, Nicolich R, Olivet Jean-Louis, Sachpazi M (1996). ''Single-bubble'' marine source offers new perspectives for lithospheric exploration. Tectonophysics, 267(1-4), 57-71. https://doi.org/10.1016/S0040-1951(96)00112-6


Avedik Felix, Renard Vincent, Allenou Jean-PierreORCID, Morvan Barthelemy (1993). "Single bubble" air‐gun array for deep exploration. Geophysics, 58(3), 366-382. https://doi.org/10.1190/1.1443420


References of Technical Reports

Viellefon Priscille (2020). Cartographie – Compilation et analyses numériques de données bathymétriques sur la dorsale Atlantique Nord centrale. Rapport de stage technique. https://archimer.ifremer.fr/doc/00679/79153/


Dyment Jérôme, Lallier François, Le Bris Nadine, Rouxel OlivierORCID, Sarradin Pierre-MarieORCID, Lamare Sylvain, Coumert Coralie, Morineaux Marie, Tourolle JulieORCID (2014). Les impacts environnementaux de l’exploitation des ressources minérales marines profondes. Expertise scientifique collective. Rapport, CNRS – Ifremer, 937 p. https://archimer.ifremer.fr/doc/00872/98434/


(1992) Campagne Dormasis - Dormasis Cruise.


Genavir (1992). DORMASIS Cahier de quart.


Ifremer, Géosciences Marines (1992). Dormasis.