RRS John Murray JM2/68
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM2/68 |
| Cruise period | 1968-02-16 — 1968-02-28 |
| Status | Completed |
| Port of departure | Las Palmas, Spain |
| Port of return | Plymouth, United Kingdom |
| Purpose | Research |
| Objectives | Principal intention to obtain 1 or 2 records of near vertical incidence reflections from explosive charges fired near a new vertical hydrophone array.
Also, to make a tape recoring of towed array output whilst ship steamed around an anchored danbuoy to see if deeper penetration could be achieved by adding signalls from successive shots. Also, to evaluate improvemetns to airgun profiling system; to test-run tape recorded; and to pressure test sealed glass spheres. |
| Chief scientist | Drummond Hoyle Matthews (University of Cambridge Department of Earth Sciences) |
| Cruise report |  (0.44 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Specific | North East Atlantic |
| Measurements | |
| Biology and fisheries | |
| Gear research | Quantity: number of stations = 6 Description: 3 trial of gear and 3 firing large charges |
| Geology and geophysics | |
| Single-beam echosounding | Description: continuous record but poor |
| Seismic refraction | Quantity: number of stations = 15 Description: seismic reflection |
