RRS James Cook JC045 (JC046)
Cruise summary report
|Ship name (ship code)||RRS James Cook (740H)|
|Cruise identifier||JC045 (JC046)|
|Cruise period||2010-04-24 — 2010-05-12|
|Port of departure||Montego Bay, Jamaica|
|Port of return||St. John's, Antigua and Barbuda|
|Objectives||The first objective was to provide the key site survey information (3-d seismic data and/or additional 2-d seismic crossing lines) for drill sites CARI-02, CARI-03 and CARI-04 located offshore from the island of Montserrat in the Lesser Antilles for IODP Proposal 681.
The second objective was to produce an unusually detailed survey of submarine volcanic debris avalanche deposits resulting from large scale slope failure on (or around) Montserrat, in order to understand the origin and emplacement dynamics of these landslides. The data collected include the first 3-d seismic data set for such submarine volcanic debris avalanches, as well as a TOBI side scan survey, 2-d seismic reflection profiling with airgun and boomer sources, multibeam bathymetry, and sub-bottom (CHIRP) profiler data.
An additional objective was to better understand how volcanic material from the ongoing eruption of the Soufriére Hills volcano (1995 to present) is redistributed around Montserrat. Marine sediments often provide a more complete record of eruption chronologies than sediments on land. This continues previous work that has linked near surface marine layers with eruptions that have been well monitored on land. This includes a comprehensive collection of shallow sediment cores from around the island, whose geometry is further constrained by sub-bottom profiler data collected during this cruise.
Multibeam bathymetry and gravimetric data were collected throughout the cruise, with the multibeam data including the off-shelf deposits from a volcanic dome collapse in February 2010.
|Chief scientist||Peter J Talling (National Oceanography Centre, Southampton)|
|Cruise report||(2.95 MB)|
|Specific||Offshore SE Montserrat in the Lesser Antilles - in the Bouillant|
|Track charts||(0.61 MB)|
|Geology and geophysics|
|Single-beam echosounding||Quantity: track kilometres = 1430|
Description: Sub-bottom Profiler (SBP 120)
|Multi-beam echosounding||Quantity: track kilometres = 1606|
Description: Multibeam Bathymetry
|Long/short range side scan sonar||Quantity: track kilometres = 159|
Description: TOBI (27-30 kHz) sidescan sonar
|Multichannel seismic reflection||Quantity: track kilometres = 176|
Description: 2-d seismic data lines with Boomer source
|Multichannel seismic reflection||Quantity: track kilometres = 418|
Description: 2-d seismic lines with 2-GI airgun source
|Multichannel seismic reflection||Quantity: track kilometres = 722|
Description: 3-d seismic survey with 2-GI airgun source
|Gravity measurements||Quantity: activity duration in days = 19|
Description: Gravity data