Planned maintenance — 18th January 2018 12:00 to 22nd January 2018 09:00 [more]

Cruise inventory

RRS John Murray JM1/69

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM1/69
Cruise period1969-01-05 — 1969-02-12
Port of departurePlymouth, United Kingdom
Port of returnBarry, United Kingdom
ObjectivesGeochemistry on the Moroccan Shelf.


To investigate the areas of interest revealed during the 1968 reconnaisance cruise. Of particular interest were the areas of phosphatic rock on two of the 1968 traverses. In addition, it was planned to study further the use of bottom radioactivity measurements in locating phosphate deposits.


Cruise 1-1969 proved a highly successful operation.

During the 21 days spent on the Moroccan shelf all but the four days in Agadir and Casablanca were fully utilised. In addtion, two days were spent on a prelimianary reconnaisance survey on the Portuguese shelf and a magnetometer traverse was run from Plymouth to the main work area. A total of more than 340 stations were completed (exclusing sub-stations).
Chief scientistColin P Summerhayes (Imperial College London Department of Geology)
Cruise reportRRS John Murray JM1/69 cruise report john_murray1_69.pdf — access key 'C' (0.94 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificMoroccan Shelf
Track chartsRRS John Murray JM1/69 cruise track — john_murray1_69trk.pdf (0.10 MB) 
Geology and geophysics 
Core - rockDescription: corer
In-situ seafloor measurement/samplingDescription: magnetometer
Seismic refractionDescription: sparker