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RRS Discovery D107
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Discovery (74E3) |
Cruise identifier | D107 |
Cruise period | 1979-12-28 — 1980-02-10 |
Status | Completed |
Port of departure | San Juan, Puerto Rico |
Port of return | Bridgetown, Barbados |
Purpose | Research |
Objectives | This cruise was part of a major collaborative international seismic experiment in the western North Atlantic involving not only RRS Discovery but also CSS Dawson as well as seismic recording stations ashore on many of the islands of the Lesser Antilles. The objectives of the experiment, which has become known as LADLE (Lesser Antilles Deep Lithosphere Experiment), was to study the oceanic lithosphere's seismic structure using sea-bed recordings of both large explosions fired at sea and earthquakes occurring beneath the Lesser Antilles island arc. To this end Discovery began the cruise with sixteen ocean-bottom seismographs most of which were to be deployed as part of a 1020km array along longitude 61 30W north of the Lesser Antilles. Shots varying in size from 1 to 8 tons were also to be fired from RRS Discovery and CSS Dawson. |
Chief scientist | Robert B Whitmarsh (Institute of Oceanographic Sciences Wormley Laboratory) |
Project | LADLE |
Cruise report | (0.97 MB) |
Ocean/sea areas | |
General | North West Atlantic Ocean (limit 40W) |
Specific | Lesser Antilles |
Track charts | |
Measurements | |
Physical oceanography | |
Surface measurements underway (T,S) | Quantity: track kilometres = 9400 Description: T only |
Meteorology | |
Incident radiation | Quantity: activity duration in days = 36 |
Routine standard measurements | Quantity: activity duration in days = 36 |
Geology and geophysics | |
Multi-beam echosounding | Quantity: track kilometres = 9400 |
Single channel seismic reflection | Quantity: track kilometres = 1000 |
Seismic refraction | Quantity: number of deployments = 3 Description: arrays of moored seismometers with shots fired from two vessels (Discovery and Dawson). |
Gravity measurements | Quantity: track kilometres = 9428.532 Description: format: magn.disk. |
Magnetic measurements | Quantity: track kilometres = 3150 Description: format: magn.disk. |