Cruise inventory

RRS Charles Darwin CD39

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD39
Cruise period1989-05-16 — 1989-06-16
Port of departureBalboa, Panama
Port of returnSan Diego, United States
ObjectivesThe objective of Cruise 39 was to conduct a controlled source electromagnetic (EM) sounding over the East Pacific Rise axis at 9 30'N, in a region where seabeam bathymetry and high quality seismic data had previously been collected. Using the electric dipole-dipole sea floor method, we planned to conduct an extensive survey of crustal conductivity beneath the ridge axis and off axis to a distance of about 20km
Chief scientistMartin C Sinha (University of Cambridge Department of Earth Sciences)
ProjectEast Pacific Rise E/M
Cruise reportRRS Charles Darwin CD39 cruise report cd39.pdf — access key 'C' (0.66 MB) 
Ocean/sea areas 
GeneralNorth East Pacific Ocean (limit 180W)
SpecificEastern Pacific Ocean
Track chartsRRS Charles Darwin CD39 cruise track — trk3626a.html RRS Charles Darwin CD39 cruise track — trk3626b.html
Physical oceanography 
BathythermographQuantity: number of profiles = 1
Other physical oceanographic measurementsQuantity: number of profiles = 1
Description: sound velocity
Geology and geophysics 
Single-beam echosoundingQuantity: track kilometres = 370
Gravity measurementsQuantity: track kilometres = 56
Magnetic measurementsQuantity: track kilometres = 56
Other geological/geophysical measurementsQuantity: track kilometres = 37
Description: Active source electromagnetic sounding, resistivity structure of oceanic crust