Cruise inventory

RRS Discovery D155

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD155
Cruise period1985-05-17 — 1985-06-10
StatusCompleted
Port of departureGovan, United Kingdom
Port of returnFalmouth, United Kingdom
PurposeResearch
ObjectivesThe main objective of this cruise was to investigate the structure of the continent-ocean crustal transition from Hatton Bank to the Atlantic on the northwest UK continental margin. The main techniques were: to shoot a grid of multichannel normal incidence seismic profiles to determine the thickness and shape of sediment crustal reflectors; to run a number of two-ship synthetic aperture profiles (SAP) across the margin to image the deep structure and to measure lateral variations in velocity; to shoot a number of expanding spread profiles (ESP) along and across using large airguns or explosive sources to find the variation of velocity with depth; and to measure underway bathymetry, magnetic and gravity fields to help constrain models of the crustal structure.
Other objectives included determination of the crustal structure in Rockall Trough by an explosion ESP, to run a long two-ship synthetic aperture profile from Hatton Bank to Rockall Trough across Rockall Plateau and the Hatton-Rockall Trough, and to study the variations in crustal structure across small Atlantic fracture zones.
Chief scientistRobert S White (University of Cambridge Department of Earth Sciences)
Cruise reportRRS Discovery D155 cruise report d155.pdf — access key 'C' (0.62 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNortheastern Atlantic - Hatton Bank - Rockall area of the N.W. UK Continental Margin
Track chartsRRS Discovery D155 cruise track — trk3149.html RRS Discovery D155 cruise track — trk3149a.html RRS Discovery D155 cruise track — trk3149b.html RRS Discovery D155 cruise track — trk3149c.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 5797
Description: T only
Geology and geophysics 
Multi-beam echosoundingQuantity: track kilometres = 5797
Single channel seismic reflectionQuantity: track kilometres = 2532
Seismic refractionQuantity: track kilometres = 1111
Gravity measurementsQuantity: track kilometres = 5797
Magnetic measurementsQuantity: track kilometres = 5797