Cruise inventory

RRS John Murray JM4/70 Leg1

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM4/70 Leg1
Cruise period1970-04-23 — 1970-05-06
Port of departureBarry, United Kingdom
Port of returnLa Rochelle, France
ObjectivesThe prupose of this cruise was:
1. Carry out a gravity survey in the SE corner of the Bay of Biscay
2. Reverse a refraction line.
3. Carry out a two ship seismic experiment with the Florence of the Institut Francais du Petrole, France.
4. To test a Lamont type airgun to carry out a controlled seismic reflection profile with airgun over a reversed refraction line.
Chief scientistF Gray (University of Cambridge Department of Earth Sciences)
Coordinating bodyNERC
Cruise reportRRS John Murray JM4/70 Leg1 cruise report john_murray4_70.pdf — access key 'C' (0.28 MB) 
Ocean/sea areas 
GeneralBay of Biscay
SpecificBay of Biscay
Track chartsRRS John Murray JM4/70 Leg1 cruise track — john_murray4_70trk.pdf (0.02 MB) 
Occasional standard measurements
Geology and geophysics 
Single channel seismic reflection
Seismic refraction
Gravity measurements
Magnetic measurements