RRS James Cook JC132
Cruise summary report
|Ship name (ship code)||RRS James Cook (740H)|
|Cruise period||2016-01-14 — 2016-02-24|
|Port of departure||Mindelo, Cape Verde|
|Port of return||Port of Spain, Trinidad and Tobago|
|Objectives||The primary objective of RRS James Cook cruise JC132 was to acquire the active-source geophysical data and seafloor imagery to complement the passive recordings of microseisms made by 25 ocean-bottom seismographs (OBS) deployed at the 13°20'N oceanic core complex on the Mid-Atlantic Ridge during JC102 and recovered during JC109.
Four main data types were collected during JC132: wide-angle recordings of airgun shots by up to 58 OBS; multichannel seismic (MCS) reflection data recorded by a 3 km streamer and airgun sources; near seafloor magnetic data and seafloor imagery recorded by Autosub. Gravity and swath bathymetry data were also acquired port-to-port. The swath bathymetry data were calibrated with a sound velocity dip undertaken at the lateral centre of the ocean-bottom seismograph grid; in the same location as sampled during JC102 and JC109.
Good quality near-seabed bathymetry and magnetic data, and both wide-angle refraction and normal incidence reflection seismic data were acquired throughout the cruise with which to address the science objectives.
|Chief scientist||Christine Peirce (University of Durham, Department of Earth Sciences), Timothy Reston (University of Birmingham School of Geography, Earth and Environmental Sciences)|
|Project||The Role and Extent of Detachment Faulting at Slow-Spreading Mid-Ocean Ridges|
|Coordinating body||Natural Environment Research Council (NERC)|
|Cruise report||(130.18 MB)|
|General||North Atlantic Ocean|
|Track charts||(0.15 MB)|
|Other physical oceanographic measurements||Quantity: number of deployments = 3|
Description: Sound velocity / temperature vs depth in three locations.
|Geology and geophysics|
|Multi-beam echosounding||Quantity: activity duration in days = 42|
Description: Swath bathymetry during all seismic profiles and during transit to-from the work area
|Multichannel seismic reflection||Quantity: number of profiles = 27|
Description: Multichannel seismic data between 13 40N - 12 00N; 44 30 - 45 30 W
|Seismic refraction||Quantity: number of deployments = 68|
Description: Ocean bottom seismograph
|Gravity measurements||Quantity: activity duration in days = 42|
Description: Gravity run continuously from Cape Verde to study area to Trinidad
|Magnetic measurements||Quantity: number of profiles = 1|
Description: Magnetics recorded during multichannel seismic profiles (G76) and from AUV (G90) near-seafloor transects
|Other geological/geophysical measurements||Quantity: number of profiles = 1|
Description: Eh, Turbidity, microbathymetry and near seafloor magnetics collected by AUV Autosub 6000 in work area around 13 20'N