RRS John Murray JM4/70 Leg 2
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM4/70 Leg 2 |
| Cruise period | 1970-05-09 — 1970-05-20 |
| Status | Completed |
| Port of departure | La Rochelle, France |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | The prupose of this cruise was:
1. Carry out a gravity survey in the SE corner of the Bay of Biscay 2. Reverse a refraction line. 3. Carry out a two ship seismic experiment with the Florence of the Institut Francais du Petrole, France. 4. To test a Lamont type airgun to carry out a controlled seismic reflection profile with airgun over a reversed refraction line. |
| Chief scientist | F Gray (University of Cambridge Department of Earth Sciences) |
| Coordinating body | NERC |
| Cruise report |  (0.28 MB) |
| Ocean/sea areas | |
| General | Bay of Biscay |
| Specific | Bay of Biscay |
| Track charts | (0.02 MB) |
| Measurements | |
| Physical oceanography | |
| Surface drifters/drifting buoys | Quantity: number of deployments = 2 Description: dahn buoy |
| Surface drifters/drifting buoys | Quantity: number of recoveries = 2 Description: dan buoy |
| Geology and geophysics | |
| Gravity measurements | Description: Askania gravimeter |
| Other geological/geophysical measurements | Quantity: number of experiments = 2 Description: shots using Aquaseis: 38 shots aquaseis at 2.5min intervals and 41 aquaseis at 1.5min |
| Other geological/geophysical measurements | Quantity: number of experiments = 2 Description: using Geophex: 30 shots at 8 minute intervals and 23 shots at 10 minute intervals |
