Report: Day, GA. 1970. RRS John Murray Cruise 1/70. (IGS Report No 3; 19) Positioning: It is assumed that Main Chain Decca was used athough it is not specifically mentioned in the Cruise Report Echo Sounding: Not mentioned in the cruise report Sonar Systems: Aberystwyth geological sonar and the IGS transit sonar. Poor quality records. Seismic Systems: EG&G sparker system: Mostly operated at 1kJ Gravitymeter: RVU LaCoste and Romberg gravity meter. Magnetometer: Varian magnetometer
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