RRS John Murray JM4/67
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM4/67 |
| Cruise period | 1967-07-24 — 1967-08-23 |
| Status | Completed |
| Purpose | Research |
| Objectives | Seismic reflection profiling.
Traverse made from Pembrokeshire across the shelf to south-west Ireland. Seismic refraction lines fired using sono-buoys. Gravimeter survey. Attempt to operate a proton magnetometer. |
| Chief scientist | Derek J Blundell (University of Birmingham Department of Geology) |
| Cruise report |  (1.14 MB) |
| Ocean/sea areas | |
| General | Irish Sea and St. George's Channel |
| Specific | Nymphe Bank and St George's Channel |
| Measurements | |
| Biology and fisheries | |
| Gear research | Description: sea-bed proton magnetometer trials |
| Geology and geophysics | |
| Single channel seismic reflection | Quantity: number of surveys = 2 Description: sparker seismic reflection profiler |
| Seismic refraction | Description: lines fired using sonobuoys, reversed lines |
| Gravity measurements | Description: Askania ship-borne gravimeter |
