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Marine geohazards
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2021
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USCGC Healy
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Project Title: |
Canadian Arctic marine continental shelf and slope geohazards |
Project Status: |
Submitted |
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Principal Investigator: |
Alexandre Normandeau, BIO |
Project Institution: |
BIO |
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Project ID: |
106870 |
Version #: |
1 |
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Date Submitted: |
7/14/2020 7:05:00 PM |
Created By: |
Alexandre Normandeau |
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Date Last Modified: |
7/14/2020 7:05:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
OTHER - NONE - Funded |
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Summary of Field Work: |
General objective
A focus on Canadian Arctic marine continental shelf and slope geohazards driven by the Geological Survey of Canada has spawned numerous Canadian and international (e.g., US and Korean) survey and marine data collection expeditions. The focus has been broad but mainly on foundation stability related to sediment mass failures and the recurrence of such events during the past 20,000 years. The 2017 Greenland tsunami serves as a reminder of the risk landslides pose and their dramatic consequences on northern communities. Determining the past record of submarine landslides can help to better estimate earthquake recurrence, sub-seafloor permafrost thawing and even iceberg discharge from glaciers. New data from Baffin Bay shows that icebergs originating primarily from Greenland trigger submarine landslides when they ground in fjords. In the western Arctic, sub-seafloor permafrost is actively thawing, potentially leading to mass failures. Therefore, Arctic regions are active regions of marine geohazards yet the lack of regional seafloor mapping impedes our understanding of the scale of these processes. Recognizing the transit nature of the planned 2021 expedition, we propose acoustic-based surveying in Baffin Bay and the NW Passage. We assume the NW Passage will be traversed in both directions and base suggestions on this. Should interest develop, we are prepared to suggest specific short sediment core sites also offshore Baffin Island and Banks Island.
Specific science activities being proposed
Multibeam and sub-bottom profiler transects across known and lesser known targets. These include: 1. Upper continental slope of Baffin Bay where mass failures mostly originate, at the mouths of cross-shelf troughs (e.g., offshore Home Bay, Clyde River, Scott Inlet), 2. Suspected shallowly buried and possibly degrading sub-sea permafrost recently identified on the inner Yukon shelf (and by extension the Alaskan Shelf), 3. Shelf-break mass failure scarps and run-out deposits at the Yukon/Alaskan border, 4. Suspected seabed-expressed neo-tectonics (outer Banks Island Shelf), and 5. glacial and low-sea level features/terrain whose geometries can be significantly improved by minimal additional transects.
Desired locations for proposed science activities
One focus is the shelf break and upper slope mass failures; the other is inner shelf permafrost in the western Arctic. A route through M’Clure Strait (subject to near ice-free conditions) would offer possibilities to confirm/refute a large late-glacial (surge) moraine genesis. This route would bypass Banks Island Shelf neotectonic faults and shelf-break glacial deposits whose geometry and timing remain unclear. Alternately, an inner-shelf route would address questions on the genesis of a large low-stand terrace. Specific transect route coordinates to intersect these targets can be supplied as mutual interest becomes more concrete. |
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Summary of Facility Requirements: |
Key requirements such as core science equipment needed: Multibeam and sub-bottom profiler as well a piston corers if available |
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Summary of other requirements and comments: |
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Type of Request: |
Collaborative Ship Use |
Request Status: |
Submitted |
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Request ID: |
1011146 |
Created By: |
Alexandre Normandeau |
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Date Last Modified: |
7/14/2020 7:05:00 PM |
Date Submitted: |
7/14/2020 7:05:00 PM |
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Year: |
2021
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Ship/Facility: |
USCGC Healy
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Optimum Start Date:
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9/14/2021 |
Dates to Avoid: |
None |
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Earliest Start Date: |
9/14/2021 |
Multi-Ship Op: |
No |
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Latest Start Date: |
10/19/2021 |
Other Ship(s): |
none |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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0 |
0 |
0 |
0 |
0 |
Repeating Cruise?
(within same year) |
No |
Interval: |
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# of Cruises: |
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Description of Repeating cruise requirements: |
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Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
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Short Description of Op Area
for use in schedules: |
Canadian Arctic |
| Description of Op Area: |
Baffin Bay and Northwest Passage |
| Op Area Size/Dia.: |
2000 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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Ending
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Foreign Clearance Required? |
No |
Coastal States:
Canada |
 Important Info on Foreign Research Clearances
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Are you or any member in your science party bringing in any science equipment items which are regulated for export by the International Traffic in Arms Regulations (ITAR) and/or the Export Administration Regulations (EAR)?
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No |
If yes, have you applied for the necessary permits through your export control office?
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No |
| Questions about ITAR/EAR regulations?
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Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.) |
None |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Nuuk (Godthab), Greenland |
None |
Nuuk (Godthab), Greenland |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
Port where Healy will depart |
Important Info on Working in Foreign Ports
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Chief Scientist: |
Alexandre Normandeau, BIO |
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# in Science Party |
1 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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1 |
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Explanation of Science Party Requirements and Technician Requirements |
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 Dynamic Positioning | ADCP |  Multibeam | Seismic |
| Dredging/Coring/Large Dia. Trawl Wire | Stern A-frame | Fiber Optic (.681) | 0.680 Coax Wire |
| SCUBA Diving | Radioisotope use - briefly describe | NO Radioisotope use/Natural level work | Other Operator Provided Inst. - Describe |
| 0 PI-Provided Vans - briefly describe | MOCNESS | | |
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Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling. |
Sub-bottom profiler, multibeam echosounder and coring device (if available)
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
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