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RRS James Cook JC152

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Cook (740H)
Cruise identifierJC152
Cruise period2017-08-25 — 2017-09-12
StatusCompleted
Port of departureSouthampton, United Kingdom
Port of returnLeith, United Kingdom
PurposeResearch
ObjectivesCruise JC152 collected the major data sets for the CHIMNEY (Characterisation of major overburden leakage pathways above sub-seafloor CO2 storage reservoirs in the North Sea) NERC highlights research programme. The cruise investigated the Scanner and Challenger pock marks in the North Sea, which were previously known to be the locations of vigorous Methane venting. The cruise objectives were to collect data that could be used to constrain the geometry and internal structures of fluid flow "Chimney" structures with the eventual aim of determining the current permeability of the sub-surface. The cruise successfully completed two anisotropy experiments over the Scanner and Challenger pock marks by shooting various seismic sources into a grid of 25 and 7 ocean bottom seismometers respectively. Five different seismic sources (Bolt airguns, GI guns, Squid surface sparker, Duraspark surface sparker, and Deep Tow Sparker) were recorded by the ocean bottom seismometers, and an acoustic recorder deployed c. 25 m above the seabed. Multichannel seismic reflection profiles were collected with GI guns and both surface sparker sources, and single channel seismic reflection profiles were collected with the Deep Tow Sparker source. Single and multichannel echo sounder data were collected along all seismic profiles.
Chief scientistJonathan M Bull (National Oceanography Centre, Southampton)
ProjectCHIMNEY
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS James Cook JC152 cruise report jc152.pdf (7.11 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificNorthern North Sea
Track chartsRRS James Cook JC152 cruise track — jc152trk.pdf (0.33 MB) 
Measurements 
Physical oceanography 
Other physical oceanographic measurementsQuantity: number of stations = 4
Description: Sound velocity/temperature versus depth
Geology and geophysics 
Geophysical measurements made at depthQuantity: number of stations = 2
Description: Broadband hydrophone deployments in the water column. Passive recordings.
Single-beam echosoundingQuantity: activity duration in days = 14
Description: Single beam echo sounding along all tracks
Multi-beam echosoundingQuantity: activity duration in days = 14
Description: Swath bathymetry along all tracks
Single channel seismic reflectionQuantity: activity duration in days = 1
Description: Deep Tow Sparker Single Channel Seismic Reflection profiling
Multichannel seismic reflectionQuantity: activity duration in days = 10
Description: Multichannel seismic reflection profiling with GI guns or surface sparkers
Seismic refractionQuantity: number of stations = 32
Description: Ocean Bottom Seismometer Deployments (OBIC)
Seismic refractionQuantity: activity duration in days = 11
Description: Seismic Refraction into OBS