Resources

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)