RRS Charles Darwin CD39
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Charles Darwin (74AB) |
| Cruise identifier | CD39 |
| Cruise period | 1989-05-16 — 1989-06-16 |
| Status | Completed |
| Port of departure | Balboa, Panama |
| Port of return | San Diego, United States |
| Purpose | Research |
| Objectives | The 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 scientist | Martin C Sinha (University of Cambridge Department of Earth Sciences) |
| Project | East Pacific Rise E/M |
| Cruise report |  (0.66 MB) |
| Ocean/sea areas | |
| General | North East Pacific Ocean (limit 180W) |
| Specific | Eastern Pacific Ocean |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Bathythermograph | Quantity: number of profiles = 1 |
| Other physical oceanographic measurements | Quantity: number of profiles = 1 Description: sound velocity |
| Geology and geophysics | |
| Single-beam echosounding | Quantity: track kilometres = 370 |
| Gravity measurements | Quantity: track kilometres = 56 |
| Magnetic measurements | Quantity: track kilometres = 56 |
| Other geological/geophysical measurements | Quantity: track kilometres = 37 Description: Active source electromagnetic sounding, resistivity structure of oceanic crust |
