RRS Charles Darwin CD55
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Charles Darwin (74AB) |
| Cruise identifier | CD55 |
| Cruise period | 1991-01-06 — 1991-02-05 |
| Status | Completed |
| Port of departure | Dakar, Senegal |
| Port of return | Dakar, Senegal |
| Purpose | Research |
| Objectives | The principal objective of the cruise was the study of the deep crustal structure across the continental-ocean transition off Ghana where the major equatorial Romanche Fracture Zone shapes the continental slope. |
| Chief scientist | Robert B Whitmarsh (Institute of Oceanographic Sciences Deacon Laboratory) |
| Cruise report |  (1.18 MB) |
| Ocean/sea areas | |
| General | Gulf of Guinea |
| Specific | Continental shelf, slope and rise off Ghana |
| Track charts |  |
| Measurements | |
| Geology and geophysics | |
| Single channel seismic reflection | Quantity: track kilometres = 1668 Description: Single channel, mostly 2x300 cubic ins guns |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00010.0W 03 31.6N 002 30.9W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00059.4W 04 45.9N 000 42.0W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 0431.6N 00002.0E |
| Seismic refraction | Quantity: track kilometres = 1080 Description: 9 lines 50' to 75' long |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00018.5W Ocean-bottom seismographs |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00104.5W 04 30.6N 000 25.3W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00010.0W 04 34.3N 000 29.5W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00034.4W 04 38.3N 000 34.1W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00042.1W also at 04 09.9N 000 06.4W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00050.5W 05 00.6N 000 56.1W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00029.9W 03 13.0N 002 24.0W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00043.1W 03 12.0N 003 08.8W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00009.7W 04 13.0N 002 30.2W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 00036.5W 04 04.1N 002 56.0W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 0437.5N 00003.4W |
| Seismic refraction | Quantity: number of deployments = 1 Description: 0404.0N 00030.5W |
| Gravity measurements | Quantity: track kilometres = 5093 |
| Magnetic measurements | Quantity: track kilometres = 1666.8 |
