Cruise inventory

RRS James Clark Ross JR19970113 (JR18)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR19970113 (JR18)
Cruise period1997-01-13 — 1997-03-05
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesCruise JR18 was devoted to controlled-source seismic investigations of the South Sandwich island arc. These investigations were part of the Sandwich Lithospheric and Crustal Experiment (SLICE), and integrated geological and geophysical study of the structure, geodynamics and composition of the arc. The main objective of the cruise was to collect four long mutlichannel seismic reflection profiles across the trench, arc and back-arc basin, recording wide-agle seismic data on ocean-bottom seismometers along two of these profiles. Three short multichannel seismic lines were also collected over a segment of the East Scotia Ridge where data from cruise JR09a (1995) had revealed the presence of a magma chamber. Magnetic and gravity data were collected along all seismic profile and passage tracks. Ocean-bottom seismometers were also deployed to augment a temporary local network of seismic stations set up on the islands by colleagues.
Chief scientistRobert D Larter (British Antarctic Survey)
ProjectSandwich Lithospheric and Crustal Experiment (SLICE)
Coordinating bodyBAS
Cruise reportRRS James Clark Ross JR19970113 (JR18) cruise report jr18.pdf — access key 'C' (4.41 MB) 
Ocean/sea areas 
GeneralSouth Atlantic Ocean
SpecificSouthern Ocean
Measurements 
Geology and geophysics 
DredgeQuantity: number of hauls = 9
Description: A number of dredges were made during the cruise.
Core - soft bottomQuantity: number of cores = 1
Description: A wax core was made during the cruise.
Single channel seismic reflectionQuantity: number of images = 23
Description: Wide-angle seismic data was collected along 2 profiles.
Multichannel seismic reflectionQuantity: number of profiles = 4
Description: Seismic reflection data was collected on a number of profiles. 2 of the profiles were short and 2 long.
Gravity measurementsQuantity: number of measurements = 1
Description: Gravity and magnetic data were collected on all of the profiles. No. of measurements not known.
Magnetic measurementsQuantity: number of measurements = 1
Description: Gravity and magnetic data were collected on all of the profiles. No. of measurements not known.