RRS John Murray JM9/79
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM9/79 |
| Cruise period | 1979-06-29 — 1979-07-12 |
| Status | Completed |
| Purpose | Research |
| Objectives | The most important objective of the cruise was to detonate explosive charges for the South West England Seismic Experiment. Charges were detonated at the southernmost (or easternmost) point of six lines across S.W. England , and also at ten points along a line between the Lizard and Start. Because of a timing transmission breakdown, one shot had to be repeated, and in all some 37 shots were successfully detonated with no misfures. Charge sizes ranged from 100m to 800m of 'Superflex' and for the larger charges (400m+) line charges were streamed in parallel so that the charge length was never longer than 300m. Not one of the charges 'blew out'. Wherever possible, shot points were checked for fish kill. |
| Chief scientist | P Neil Chroston (University of East Anglia School of Environmental Sciences) |
| Project | Southwest England Seismic Experiment (SWESE) |
| Cruise report |  (0.23 MB) |
| Ocean/sea areas | |
| General | English Channel |
| Track charts |  |
| Measurements | |
| Geology and geophysics | |
| Single channel seismic reflection | Quantity: track kilometres = 1482 |
| Seismic refraction | Quantity: number of deployments = 45 |
| Magnetic measurements | Quantity: track kilometres = 370.4 Description: seismic shots were fired for crews recording on land |
