Data collected in association with the project
In preparation for the project, geophysical data sets were collected in 2018 with support from professor Stefan Bünz, leader of the gas hydrate and free gas reservoir group at CAGE.
Data collected under SEAMSTRESS is being used primarily for advancing project objectives related to gas hydrates and seepage dynamics. However, each expedition has been planned such as data collected can be of used for addressing diverse objectives within paleoceanography, paleo climate, marine geohazards and seismology.
The data is being stored at the Department of Geosciences data base, UiT – The Arctic University of Norway. For the duration of the project data can be made available through collaborative projects with PhD students, post doctoral fellows and researchers within SEAMSTRESS.
Cruise CAGE18-4 https://cage.uit.no/cruise/cage-cruise-18-4/
- P-Cable 3D seismic volumes from the currently extinct (or reduced seepage activity) segment of the Vestnesa Ridge. The data is being used for a PhD student within SEAMSTRESS.
- 23 data sets from 4-component Ocean Bottom Seismic recorders (18 from Geomar, 5 from UiT) deployed around a gas seepage pockmark for P and S wave velocity analyses. The P-wave reflection data is being used by a PhD student based at Geomar to conduct a P-wave velocity tomography. The S-wave data is being used by a CAGE post doc to investigate anisotropy and local in situ stress field variations.
- (deployment) 7 long term OBS stations – 5 from Geomar, 2 from UiT (deployed for up to 1 year; some of Geomar instruments recorded only 4 months due to technical problems.
- 2D seismic lines associated to both the active and the passive source experiments
Cruise CAGE19-3 https://cage.uit.no/cruise/calypso-coring-in-the-fram-strait/
- 19 Calypso sediment cores (5 particularly key for the Seamstress project) and gravity cores
- Shear strength (measured on board for the calypso cores) and water content (only for some cores)
- Oedometer tests from 2 samples along 4 of the calypso cores (NGI)
- Triaxial tests from 2 samples along 2 of the calypso cores (NGI)
- Index test from 2 samples along 4 of the Seamstress calypso cores (NGI)
- MSCL and x-ray scanner of all the cores
- Sub bottom profiles over each calypso core
- 3 Piezometer Stations with in-situ pore fluid pressure and temperature (Ifremer – Sultan et al., 2020)
Cruise CAGE20-5 https://cage.uit.no/cruise/20-5/
- (recovery) 7 long term OBS stations along Vestnesa Ridge with variable distances from the seeping pockmarks – 5 from Geomar, 2 from UiT (deployed for up to 1 year but some of Geomar instruments recorded only 4 months due to technical problems). Data for the second PhD project within SEAMSTRESS
- (deployment) 10 long term OBS stations for the investigation of local seismicity at the faults north of the Knipovich ridge termination (Vestnesa Basin) – 8 from AWI, 2 from UiT.
- 2D seismic lines in the area for OBS related studies and as side surveys for the FRAME-IODP proposal
- 3D P-cable seismic volume from the Hummocky depression (known as the NKR depression) at the corner between the Knipovich ridge termination and the Molloy Transform Fault intersection
- 4 Piezometer stations (Ifremer) with in situ pressure and temperature down to 9 m
- 5 multi component Ocean Bottom Seismometers (Ifremer) that recorded over 3 days, distributed at controlled distance away from an active seepage pockmark (Lomvi)
- 27 Heat flow sites from the slope to the western termination of the Vestnesa Ridge
- 19 Chirp lines in the area
- (recovery) 10 long term OBS stations for the investigation of local seismicity at the faults north of the Knipovich ridge termination (Vestnesa Basin) – 8 from AWI, 2 from UiT. These data is for the second PhD project within SEAMSTRESS
- 2D high resolution seismic lines to complete the survey over outcropping faults and gravitational collapse features
- Repetition of bathymetry to investigate whether geomorphological changes can be spotted at gravitational collapse features over the last 10 years
- Active source experiment with 5 OBSs (3 AWI, 2 UiT) at the NKR Hummocky depression with particular focus on S-wave analyses and local stress field variations (comparison with the eastern Vestnesa ridge shear wave experiment and experiments by Exley et al. and Chabert et al., )