Cruise inventory

RRS John Murray JM2/68

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM2/68
Cruise period1968-02-16 — 1968-02-28
Port of departureLas Palmas, Spain
Port of returnPlymouth, United Kingdom
ObjectivesPrincipal intention to obtain 1 or 2 records of near vertical incidence reflections from explosive charges fired near a new vertical hydrophone array.

Also, to make a tape recoring of towed array output whilst ship steamed around an anchored danbuoy to see if deeper penetration could be achieved by adding signalls from successive shots.

Also, to evaluate improvemetns to airgun profiling system; to test-run tape recorded; and to pressure test sealed glass spheres.
Chief scientistDrummond Hoyle Matthews (University of Cambridge Department of Earth Sciences)
Cruise reportRRS John Murray JM2/68 cruise report john_murray2_68.pdf — access key 'C' (0.44 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNorth East Atlantic
Biology and fisheries 
Gear researchQuantity: number of stations = 6
Description: 3 trial of gear and 3 firing large charges
Geology and geophysics 
Single-beam echosoundingDescription: continuous record but poor
Seismic refractionQuantity: number of stations = 15
Description: seismic reflection