Cruise inventory

RRS Shackleton S8/77,Leg 2

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Shackleton (74SF)
Cruise identifierS8/77,Leg 2
Cruise period1977-07-04 — 1977-07-26
Port of departureAberdeen, United Kingdom
Port of returnReykjavík, Iceland
Objectives1) Observation of the micro-eathquakes on the Reykjanes Ridge with an array of Ocean Bottom Seismographs near 59½° N.

2) Determination of the structure of the ridge by means of three long range seismic refraction profiles positioned along the 0,4 and 9 My isochrons.

3) Projectile experiment. Ten projectiles were dropped to the sea bed to see whether their impacts could be detected by the OBS.

4) Temperature measurement. An IOS temperature- telemetering pinger was towed near the seafloor to look for temperature anomalies in the water which might be associated with geothermal springs
Chief scientistTim J G Francis (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Shackleton S8/77,Leg 2 cruise report shackleton8_77.pdf — access key 'C' (0.47 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRRS Shackleton S8/77,Leg 2 cruise track — trk1843.html
Physical oceanography 
Subsurface temperature and salinity measurements
Geology and geophysics 
Single-beam echosoundingQuantity: 200
Single channel seismic reflectionQuantity: 100
Seismic refractionQuantity: 180
Gravity measurementsQuantity: track kilometres = 370.4
Magnetic measurementsQuantity: track kilometres = 370.4