RRS Discovery D90
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Discovery (74E3) |
| Cruise identifier | D90 |
| Cruise period | 1978-01-20 — 1978-03-03 |
| Status | Completed |
| Port of departure | South Shields, United Kingdom |
| Port of return | Brest, France |
| Purpose | Research |
| Objectives | Following the successful use of the long-range side-scan sonar in the Rockall Trough during Cruise 84, it was planned to make a wider study of the continental margin of northwest Europe utilising the technique of producing sonograph mosaics of substantial areas. Simultaneous bathymetric, seismic reflection and gravity measurements would also be made. It was planned to concentrate the main effort of the cruise in the Southwestern Approaches and off Portugal with alternative areas to the south reserved as bad weather options. |
| Chief scientist | David G Roberts (Institute of Oceanographic Sciences Wormley Laboratory) |
| Cruise report |  (0.79 MB) (5.27 MB) |
| Ocean/sea areas | |
| General | North Atlantic Ocean Bay of Biscay |
| Track charts |  |
| Measurements | |
| Meteorology | |
| Routine standard measurements | Quantity: track kilometres = 12260.24 |
| Geology and geophysics | |
| Multi-beam echosounding | Quantity: track kilometres = 12260 |
| Long/short range side scan sonar | Quantity: track kilometres = 1000 Description: 36kHz |
| Single channel seismic reflection | Quantity: track kilometres = 10093 |
| Seismic refraction | Quantity: 3 Description: sono-buoy |
| Gravity measurements | Quantity: track kilometres = 11334.24 |
| Magnetic measurements | Quantity: track kilometres = 10445.28 |
| Other geological/geophysical measurements | Quantity: track kilometres = 9408.16 Description: profiler,35 kHz |
| Other geological/geophysical measurements | Quantity: track kilometres = 8797 Description: gloria side scan |
