Cruise inventory

RRS Discovery D91

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD91
Cruise period1978-03-05 — 1978-03-28
Port of departureBrest, France
Port of returnSouthampton, United Kingdom
Objectives1. To examine the nature of the Azores spreading centre, to map its junction with the Mid Atlantic Ridge, and to examine the effect of the adjacent Azores hot spot on the structure of the Mid Atlantic Ridge crest.
2. To obtain reconnaissance coverage of the north-eastern part, and to make a detailed survey of the rest, in particular to determine its south-western extent.
Chief scientistRoger C Searle (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Discovery D91 cruise report d90_91_data_report.pdf — access key 'C' (5.27 MB)  RRS Discovery D91 cruise report d91.pdf (0.52 MB) 
Ocean/sea areas 
GeneralBay of Biscay
North East Atlantic Ocean (limit 40W)
Track chartsRRS Discovery D91 cruise track — trk1895.html
Incident radiationQuantity: track kilometres = 7963.6
Routine standard measurementsQuantity: track kilometres = 7963.6
Geology and geophysics 
Multi-beam echosoundingQuantity: track kilometres = 7964
Long/short range side scan sonarQuantity: track kilometres = 6482
Single channel seismic reflectionQuantity: track kilometres = 6945
Seismic refractionQuantity: 11
Gravity measurementsQuantity: track kilometres = 7778.4
Magnetic measurementsQuantity: track kilometres = 7685.8