RRS John Murray JM4/69

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM4/69
Cruise period1969-05-02 — 1969-05-24
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
ObjectivesThe purpose of this cruise was to extend work already carried out in the Porcupine Bank and Porcupine Bight area by Discovery in 1966. One refraction line to be shot to look at sediment thickness at the Bight limited to 30miles long. A second line shot in deeper water to obtain Moho arrivals. Propose to carry out reflection profiling with an airgun. Extend previous gravity and magnetic sureveys over the Bank.
Chief scientistF Gray (University of Cambridge Department of Earth Sciences)
Cruise reportRRS John Murray JM4/69 cruise report john_murray4_69.pdf (0.17 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificPorcupine Bank and Porcupine Bight
Geology and geophysics 
In-situ seafloor measurement/samplingDescription: magnetometer
Seismic refractionDescription: sparker
Gravity measurementsDescription: gravimeter