Cruise inventory

RV Eastella EA08/89

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Eastella (740A)
Cruise identifierEA08/89
Cruise period1989-07-19 — 1989-08-08
Port of departureLiverpool, United Kingdom
Port of returnHull, United Kingdom
ObjectivesBottom shot experiments with ocean bottom seismographs in the Norwegian Sea.
This cruise was carried out under a contract with the Admiralty Research Establishment, Portland to make and interpret measurements of seismic velocities in the top 1000m or so below the sea-bed. Six sites were to be visited in the Norwegian Sea along a line from about 62 degrees 20 minutes north, 15 degrees 40 minutes west to 64 degrees 15 minutes north, 2 degrees 20 minutes west. At each site the same sequence of experiments was planned. Bottom shots were to be deployed along a line a few kilometers long and recorded by two digital ocean-bottom seismographs (DOBS). These instruments had previously been modified under an earlier contract in order that they could record digitally the rather high frequency signals generated by such bottom shots. In addition the DOBS were to record shots fired by an array of near-surface airguns. Reflection profiles were also to be obtained to aid the interpretation of the seismic refraction profiles and disposable sonobuoys were deployed as opportunites arose.
Chief scientistRobert B Whitmarsh (Institute of Oceanographic Sciences Deacon Laboratory)
Cruise reportRV Eastella EA08/89 cruise report eastella_jul89.pdf — access key 'C' (0.68 MB) 
Ocean/sea areas 
GeneralNorwegian Sea
SpecificNorwegian Sea
Track chartsRV Eastella EA08/89 cruise track — eastella_jul89track.pdf (0.02 MB) 
Physical oceanography 
BathythermographQuantity: number of profiles = 5
Geology and geophysics 
Single-beam echosoundingQuantity: track kilometres = 1667
Multichannel seismic reflectionQuantity: 114
Seismic refractionQuantity: 130