Cruise inventory

RRS John Murray JM8/68 Leg 1

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM8/68 Leg 1
Cruise period1968-06-29 — 1968-07-12
StatusCompleted
Port of departurePlymouth, United Kingdom
Port of returnLerwick, United Kingdom
PurposeResearch
ObjectivesMain objectives:

1. To investigate the geological and crustal structure of the continental shelf and margin to the north-west of the Orkney and Shetland Islands, including traverses using gravimeter, magnetometer and seismic profiling.
2. To continue investigation of the Winch started in 1967
3. To test airgun profiling system.
Chief scientistMartin H P Bott (University of Durham, Department of Geological Sciences)
Cruise reportRRS John Murray JM8/68 Leg 1 cruise report john_murray8_68.pdf — access key 'C' (0.28 MB) 
Ocean/sea areas 
GeneralNorth Sea
Inner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)
SpecificThe Minch, and the seas around Orkney, Shetland and the Faeroe Islands
Track chartsRRS John Murray JM8/68 Leg 1 cruise track — john_murray8_68trk.pdf (00 MB) 
Measurements 
Geology and geophysics 
Single channel seismic reflectionQuantity: number of profiles = 4
Description: traverses - gravimeter, magnetometer and sparker: of the Minch, 2 part shelf survey and an Orkneys-Faroe traverse
Gravity measurementsQuantity: number of observations = 1
Description: gravimeter base
Gravity measurementsQuantity: number of profiles = 1
Description: gravity and magentometer line
Gravity measurementsQuantity: number of profiles = 4
Description: traverses - gravimeter, magnetometer and sparker: of the Minch, 2 part shelf survey and an Orkneys-Faroe traverse
Magnetic measurementsQuantity: number of profiles = 4
Description: traverses - gravimeter, magnetometer and sparker: of the Minch, 2 part shelf survey and an Orkneys-Faroe traverse
Magnetic measurementsQuantity: number of profiles = 1
Description: gravity and magentometer line