RRS John Murray JM3/69
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM3/69 |
| Cruise period | 1969-04-08 — 1969-04-22 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | The primary aim of Cruise 3/69 was to make a seismic-refraction survey of two sedimentary troughs, one lying north-west, and one south-east of Arran. The general structure of the area had been determined previously by sea-bottom gravity-meter and magnetic surveys and it was hoped the refraction results would assist in identifying the geological formations present. It was planned to use time surplus to this programme for seismic profiling and magnetics in areas of special geological interest within the Firth; and (as an insurance against failure of the refraction programme) some reconnaissance lines to the west of Kintyre were planned, but did not have to be run. |
| Chief scientist | Adam C McLean (University of Glasgow Department of Geology) |
| Cruise report |  (0.40 MB) |
| Ocean/sea areas | |
| General | North Atlantic Ocean |
| Track charts |  |
| Measurements | |
| Geology and geophysics | |
| Multi-beam echosounding | Quantity: track kilometres = 796 |
| Single channel seismic reflection | Quantity: track kilometres = 796 |
| Seismic refraction | Quantity: number of track lines = 4 Description: Each approximately 19km |
| Magnetic measurements | Quantity: track kilometres = 796 |
