CROC II

Name: CROC II
Start: 1981-08-15
End: 1981-09-10
Location: Mediterranean Sea, Western Basin

Type	Oceanographic cruise
Ship	Le Suroît
Ship owner	Ifremer
Dates	15/08/1981 - 10/09/1981
Chief scientist(s)	LE DOUARAN S, AVEDIK Felix
	ELF AQUITAINE PRODUCTION Departement Procede 64000 PAU +33(0)5.59.83.57.14
DOI	10.17600/81003311
Objective	Seismic refraction study of the transition zone between the continental crust and the oceanic crust, in the Gulf of Lion, between parallels 41 deg and 45 deg North and meridians 3 deg 30mn and 9 deg East N. Transmitter: Suroit, recorder: Resolution (from IFP). (NDR: Crossing points of ships in CR in SISMER).

Sea/Ocean

Mediterranean Sea, Western Basin

Ports

Port of departure : Toulon (France)

Port of return : Toulon (France)

Project

EUROSEISMIC EUROPEAN SEISMIC METADATA AND INFORMATION CENTRE

Scientific Authority

ELF AQUITAINE PRODUCTION

Departement Procede

64000 PAU

+33(0)5.59.83.57.14

Participating bodie(s)

CNEXO, COMITE D'ETUDES PETROLIERES MARINES

Discipline(s)

MARINE GEOSCIENCES

Code	Label	Quantity	PI
G26	Seismic refraction With 2 boats (CDP & FD)	-	LE DOUARAN S
G28	Magnetic measurements	-	LE DOUARAN S
G73	Single-beam echosounding Bathymetry 12 KC sounder	-	LE DOUARAN S

Summary of measurements

-34 refraction seismic profiles using the "two vessel" technique (N/O Suroit in shooter and N/O PFO resolution in receiver).
-32 profiles with midpoint as reference (CDP - Common Depth Point).
-2 profiles with a fixed distance between the 2 vessels (FD - Fixed Distance).
-3 inverse profiles carried out with the N/O Suroit alone using sonobuoys.
-Source: 3x16.4l Bolt air guns, firing rate 90 seconds in 1st part and 40 seconds in 2nd part (from 5 to 8/09), speed 5 knots.
-The seismic data are at the SNEA (P) in Pau.
-Navigation listing is at DRO/GM, with a copy at SISMER.

Positionning system

Geodetic system : VALEUR INDEFINIE

Positioning system : Sat+LoranC M:Cineci-E:Lampedusa,Estartit

Bibliography

Publications

Moulin Maryline , Klingelhoefer Frauke , Afilhado Alexandra, Aslanian Daniel , Schnurle Philippe , Nouze Herve, Rabineau Marina, Beslier Marie-Odile, Feld Aurelie (2015). Deep crustal structure across a young passive margin from wide-angle and reflection seismic data (The SARDINIA Experiment) - I. Gulf of Lion's margin. Bulletin De La Societe Geologique De France, 186(4-5), 309-330. Publisher's official version : https://doi.org/10.2113/gssgfbull.186.4-5.309 , Open Access version : https://archimer.ifremer.fr/doc/00283/39422/

Le Douaran Sylvie, Burrus Jean, Avedik Felix (1984). Deep structure of the north-western Mediterranean Basin: Results of a two-ship seismic survey. Marine Geology, 55(3-4), 325-345. https://doi.org/10.1016/0025-3227(84)90075-6

References of Technical Reports

(1982) Plans de positions - campagnes CROC 2 et FLUMED.

Avedik Felix (1981). Mission sismique Réfraction Reframage (CROC - 2) en Méditerranée occidentale du 14 aout au 9 septembre 1981. Projet COB N° 124.101.

Le Douaran S (1981). "CROC II" - Compte rendu de la première partie de la campagne (Réfraction à 2 bateaux) - 14 Août au 8 Septembre 1981. GEO/CEG N° 1-1785 RS.

Le Douaran S., Burrus J., Avedik Felix (1981). Projet CROC 2 - Campagne CEPM de sismique réfraction en Méditerranée Nord Occidentale - 14 août / 8 septembre 1981 - Rapport d'interprétation. IFP Géologie : n°25422.