We have a new paper in Science Advances on seasonal movements of the sub-Arctic seafloor. Using sub-annual bathymetry, porewater data, and moored sensors, we observed the seabed expanding and contracting through freeze–thaw cycles, forming seasonal frost blisters.
doi.org/10.1126/scia...
Map showing the location of the two study sites in western Baffin Bay (Scott Trough and Home Bay) along with earthquake epicenters (between 1985 and 2023) and their magnitudes
📣The May issue of CJES is now LIVE.
📃Featuring: "Holocene earthquake-triggered submarine landslides and turbidites in western Baffin Bay" by @sedialex.bsky.social et al. cdnsciencepub.com/doi/full/10....
📸Fig 1. Study sites in western Baffin Bay. #marine #landslide #geosky #earthquake #geoscience
Thanks! We had fun writing it!
Figure from the scientific study illustrating the many processes operating in a glacierized floor and the sediments that are left behind on the seafloor
Our new study out in G-cubed, wrapping up 8 years of repeat seafloor mapping, flow monitoring, and sediment coring in a glacierized fjord. We made some interesting discoveries about how glaciers, turbidity currents, and submarine landslides interact in these dynamic environments
tinyurl.com/49xms8hr
Ooooh new paper from @sedialex.bsky.social that is going to go right to the top of my pile of papers to read! 🧪⚒️ "Processes and Products of Turbidity Currents and Submarine Landslides in a Glacierized Fjord (Southwind Fjord, Baffin Island)" agupubs.onlinelibrary.wiley.com/doi/full/10....
We departed from Punta Arenas, but we didn't conduct any science in Chile. However, the cruise was preceded by the signing of an MOU between Chile and Canada to strengthen research collaborations: www.linkedin.com/posts/polar-...
Elisabeth Steel (Queen's U.) and I invite you to submit abstracts on clastic marine sedimentology. Our session aims to connect marine sedimentologists working on modern, experimental, and ancient depositional systems, bridging the gap between these fields. Deadline for abstract submission: Feb. 16!
Just like the 1929 earthquake was recorded in marine sediments offshore Atlantic Canada, the 1933 earthquake triggered a turbidite in Baffin Bay. Sediment cores from the region suggest other large earthquakes occurred during the late Holocene. Stay tuned for our upcoming paper on the subject
The earthquake triggered a submarine landslide and turbidite recorded in marine sediments offshore Atlantic Canada. We know other very large landslides occurred during the last 4,000 years thanks to marine sediment cores collected in the deep waters of eastern Canada
These same sediment cores being analyzed through a CT-Scan and a μCT-Scan to reconstruct the past history of the region
Illustration showcasing the various tools deployed from a scientific vessel, including multibeam echosounders, piston coring, autonomous underwater vehicles, remotely operated vehicles and moorings.
How is marine geoscience conducted at the Geological Survey of Canada? Here are some of the tools we use to characterize the seafloor and monitor seabed processes, in collaboration with our partners from academia and other government departments.
ADCPs in a float deployed from a ship
A sediment trap floating in the ocean
An autonomous underwater vehicle deployed from a ship
We deployed an autonomous underwater vehicle and 3 moorings in Shortland Canyon, eastern Canada, from the RRS Discovery. Sediment cores were also recovered from the canyon bottom. These data will allow us to understand the physical oceanography and seabed processes in eastern Canadian canyons.
Thanks! I find them very useful for outreach presentations
Image illustrating piston coring operations
Image illustrating multibeam echosounder operations
A few years ago, I created animations to illustrate how geological sampling and surveys are conducted at sea. Here are two examples: 1) piston coring to collect long sediment cores 2) multibeam surveys to create maps of the seafloor. Animations are available here: sites.google.com/view/normand...
