Cruise inventory

RRS John Murray JM5/70 Leg 2

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM5/70 Leg 2
Cruise period1970-06-20 — 1970-06-30
StatusCompleted
Port of departureStornoway, United Kingdom
Port of returnLerwick, United Kingdom
PurposeResearch
ObjectivesThe objectives of the cruise were to continue investigations of the deep structure beneath the north Scottish shelf and margin and across the intervening deep channel on to the Faeroe Rise.

First two weeks: planned to make a preliminary survey of the shelf and margin to the west of the Outer Hebrides and to carry out prelimnary traverses across the main seamounts and banks between Rockall and the Faeroe Islands (observing bathymetry, gravity, magnestics, seismic profiling and using sonobuoys)

Second two weeks: original plan to carry out sono-buoy refraction surveys to determine sediment thickness beneath the Faeroe-Shetland channel and beneath shelf gravity anomalies

Third two weeks: further lines across the shelf, margin and parts of the Faeroe Rise were planned.
Chief scientistMartin H P Bott (University of Durham, Department of Geological Sciences)
Cruise reportRRS John Murray JM5/70 Leg 2 cruise report john_murray5_70.pdf — access key 'C' (0.43 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificContinental slope off NW Scotland
Track chartsRRS John Murray JM5/70 Leg 2 cruise track — john_murray5_70trk.pdf (00 MB) 
Measurements 
Geology and geophysics 
Single channel seismic reflectionQuantity: number of surveys = 6
Description: gravitmeter and magnetometer lines including sparker
Seismic refractionQuantity: number of profiles = 4
Description: lines with Bradley buoy system
Gravity measurementsQuantity: number of profiles = 13
Description: gravitmeter and magnetometer lines
Magnetic measurementsQuantity: number of profiles = 13
Description: gravitmeter and magnetometer lines