RRS John Murray JM7/69
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM7/69 |
| Cruise period | 1969-08-29 — 1969-09-22 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | Centrally to the cruise was a seismic experiment to determine crustal structure along lines westwards from the Pembrokeshire coast to the continental margin southwest of Ireland. The R.R.S. John Murray occupied sono-buoy recording stations and acted as communications centre to liase between other ships and stations.
Several minor experiments were scheduled: a) collection of surface sea water samples at two stations b) trials of oceanographic logging equipment c) trials with a sono-buoy and sparker and an airgun to obtain wide angle reflections and refractions. |
| Chief scientist | Derek J Blundell (University of Birmingham Department of Geology with Geophysics) |
| Cruise report |  (0.40 MB) |
| Ocean/sea areas | |
| General | Irish Sea and St. George's Channel Celtic Sea North East Atlantic Ocean (limit 40W) |
| Specific | St George's Channel, Celtic Sea and Porcupine Seabight |
| Measurements | |
| Physical oceanography | |
| Water bottle stations | Quantity: number of stations = 2 Description: T surface only |
| Geology and geophysics | |
| In-situ seafloor measurement/sampling | Description: magnetometer |
| Seismic refraction | Description: sparker |
