British Geological Survey (BGS) Geophysical Survey 1970/1: Irish Sea west of Anglesey (28/01/1970 to 23/02/1970)

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