MV Briarthorn 1/74

Cruise summary report

Cruise Info. 
Ship name (ship code)MV Briarthorn (74B6)
Cruise identifier1/74
Cruise period1974-06-30 — 1974-07-08
Port of departurePlymouth, United Kingdom
Port of returnLeith, United Kingdom
ObjectivesThe ship was on passage from Plymouth, following surveys in the Celtic Sea and the English Channel, to Leith, for preparation for surveys in the northern North Sea and Shetland areas. Plans were made to undertake passage work, as follows:-

1. Calibration of new Magnavox Intergrated Doppler Sonar Satellite Navigation System (hearafter SAT/NAV)
2. Gravity and shallow seismic surveys in the Irish Sea.
3. Passage line between Irish Sea and Sea of the Hebrides.
4. Detailed shallow seismic survey of Canna Tertiary Basin.
5. Seismic refraction profile across Canna Tertiary Basin.
6. Passage dog-leg profiles in West Orkney area.

Calibration of the SAT/NAV was given first priority. Irish Sea and Canna surveys second priority. Other work as possible
Chief scientistR McQuillin (Institute of Geological Sciences, Edinburgh)
Cruise reportMV Briarthorn 1/74 cruise report briarthorn1_74.pdf (5.49 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
Geology and geophysics 
Long/short range side scan sonarQuantity: track kilometres = 630
Single channel seismic reflectionQuantity: track kilometres = 450
Seismic refractionQuantity: track kilometres = 13
Gravity measurementsQuantity: track kilometres = 540
Magnetic measurementsQuantity: track kilometres = 440
Other geological/geophysical measurementsQuantity: track kilometres = 400
Description: pinger