Cruise inventory

RRS Discovery D23

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD23
Cruise period1968-07-31 — 1968-08-19
Port of departurePlymouth, United Kingdom
Port of returnPlymouth, United Kingdom
ObjectivesThe principal objective in this short cruise was the trial at sea and subsequent use of a new technique of seismic recording on the deep sea floor using pop-up methods. These experiments using surface explosive charges were combined with surface sonobuoy receivers using internal recorders and without radio links to the ship. The scientific aims of the seismic work were to detect reflections from the Moho using vertical and oblique incidence ray paths and to make a series of crustal structure refraction stations across the continental margin north of the Bay of Biscay.
Chief scientistAnthony S Laughton (National Institute of Oceanography)
ProjectGeophysics in and around the Bay of Biscay
Cruise reportRRS Discovery D23 cruise report d23.pdf — access key 'C' (5.19 MB) 
Ocean/sea areas 
GeneralBay of Biscay
Track chartsRRS Discovery D23 cruise track — d23track.pdf (0.41 MB) 
Geology and geophysics 
Single channel seismic reflection
Seismic refractionQuantity: number of stations = 3
Gravity measurementsDescription: Gravimeter operated on all passage and survey lines.
Magnetic measurementsQuantity: track kilometres = 1481.6
Description: Magnetometer towed along all passage tracks as a matter of routine to fill gaps in existing data.