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RRS Discovery DY072

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74EQ)
Cruise identifierDY072
Cruise period2017-02-28 — 2017-04-02
StatusCompleted
Port of departureSanta Cruz de Tenerife, Spain
Port of returnSanta Cruz de Tenerife, Spain
PurposeResearch
ObjectivesThe goal of the Passive Imaging of the Lithosphere Asthenosphere Boundary (PILAB) project is a better understanding of the tectonic plate. The PI-LAB experiment will image the crust and mantle at the same location using a variety of geophysical methods with multiple scales of resolution and sensitivity to determine the defining mechanism of the tectonic plate. Specifically, the project will use passive source seismology and magnetotellurics to image the crust and upper most mantle beneath 0 M.y. to 80 M.y. aged seafloor from the slow spreading Mid-Atlantic Ridge near the Chain and Romanche Fracture Zones.

The cruise was to retrieve 39 broadband ocean bottom seismometers and 39 magnetotelleuric instruments that were deployed in March 2016. Before retrieval, we surveryed in the seismic stations to determien precise locations. We also collected gravity, multibeam bathymetry, sidescan sonar, and magnetics. Finally, we completed a survery of the Chain Fracture Zone to better constrain local tectonics.
Chief scientistCatherine A Rychert (University of Southampton School of Ocean and Earth Science)
Cruise reportRRS Discovery DY072 cruise report dy072.pdf (11 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
South Atlantic Ocean
SpecificCentral Atlantic
Track chartsRRS Discovery DY072 cruise track — dy072trk.pdf (0.28 MB) 
Measurements 
Geology and geophysics 
Multi-beam echosoundingQuantity: number of surveys = 1
Description: Underway geophysical survey of the western end of the Chain Fracture zone. Swath bathymetry, swath sidescan sonar, gravity and total field magnetics measurements.
Long/short range side scan sonarQuantity: number of surveys = 1
Description: Underway geophysical survey of the western end of the Chain Fracture zone. Swath bathymetry, swath sidescan sonar, gravity and total field magnetics measurements.
Gravity measurementsQuantity: number of surveys = 1
Description: Underway geophysical survey of the western end of the Chain Fracture zone. Swath bathymetry, swath sidescan sonar, gravity and total field magnetics measurements.
Magnetic measurementsQuantity: number of surveys = 1
Description: Underway geophysical survey of the western end of the Chain Fracture zone. Swath bathymetry, swath sidescan sonar, gravity and total field magnetics measurements.
Magnetic measurementsQuantity: number of recoveries = 37
Description: Ocean bottom magnetotelluric instruments (OBMT)
Other geological/geophysical measurementsQuantity: number of recoveries = 38
Description: Broadband ocean bottom seismometers (OBS)
Data held at BODC Get data
Series/Profiles 
1  Meteorological data logger
Visible waveband radiance and irradiance measurements in the atmosphere
Horizontal spatial co-ordinates
Air pressure
Date and time
Air temperature
Wind strength and direction
Raw light meter output
Solar Radiation
Atmospheric humidity
Visible waveband radiance and irradiance measurements in the atmosphere
Horizontal spatial co-ordinates
Air pressure
Date and time
Air temperature
Wind strength and direction
Raw light meter output
Solar Radiation
Atmospheric humidity

BODC idDate/TimeLocationDoc.
18169972017-02-28 20:40:30  — 2017-04-02 10:29:30 2° 25' 10" S  19° 29' 9" W — 28° 27' 39" N  6° 35' 58" W  View metadata report for BODC series reference number 1816997
1  Multi-beam echosounder
Horizontal spatial co-ordinates
Date and time
Platform or instrument orientation
Horizontal platform movement
Bathymetry and Elevation
Horizontal spatial co-ordinates
Date and time
Platform or instrument orientation
Horizontal platform movement
Bathymetry and Elevation

BODC idDate/TimeLocationDoc.
18169852017-02-28 20:40:30  — 2017-04-02 10:29:30 2° 25' 10" S  19° 29' 9" W — 28° 27' 39" N  6° 35' 58" W  View metadata report for BODC series reference number 1816985
1  Multiple instrument types
Horizontal spatial co-ordinates
Transmittance and attenuance of the water column
Date and time
Temperature of the water column
Salinity of the water column
Metadata parameters
Raw suspended particulate material concentration sensor output
Electrical conductivity of the water column
Raw fluorometer output
Chlorophyll pigment concentrations in water bodies
Horizontal spatial co-ordinates
Transmittance and attenuance of the water column
Date and time
Temperature of the water column
Salinity of the water column
Metadata parameters
Raw suspended particulate material concentration sensor output
Electrical conductivity of the water column
Raw fluorometer output
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
18170002017-02-28 20:40:30  — 2017-04-02 10:29:30 2° 25' 10" S  19° 29' 9" W — 28° 27' 39" N  6° 35' 58" W  View metadata report for BODC series reference number 1817000