RRS John Murray JM5/70 Leg 3
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM5/70 Leg 3 |
| Cruise period | 1970-07-01 — 1970-07-14 |
| Status | Completed |
| Port of departure | Lerwick, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | The 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 scientist | J H Peacock (University of Durham, Department of Geological Sciences) |
| Cruise report |  (0.43 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Specific | Faeroe Shetland channel |
| Track charts | (0.04 MB) |
| Measurements | |
| Geology and geophysics | |
| Single channel seismic reflection | Quantity: number of profiles = 3 Description: disposable sonobuoys, seismic reflection |
| Gravity measurements | Quantity: number of profiles = 8 Description: gravimeter and magnetometer lines |
| Magnetic measurements | Quantity: number of profiles = 8 Description: gravimeter and magnetometer lines |
| Other geological/geophysical measurements | Quantity: number of profiles = 8 Description: gravimeter and magnetometer lines, with depth recorder and airgun profiling |
