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Cascadia Subduction
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2020
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Marcus Langseth
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Project Title: |
Collaborative Research: Illuminating the Cascadia plate boundary zone and accretionary wedge with a regional-scale ultra-long offset multi-channel seismic study |
Project Status: |
Submitted |
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Principal Investigator: |
Suzanne M. Carbotte, LDEO |
Project Institution: |
LDEO |
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Project ID: |
106030 |
Version #: |
1 |
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Date Submitted: |
3/27/2018 11:23:00 AM |
Created By: |
Suzanne M. Carbotte |
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Date Last Modified: |
8/23/2018 11:06:00 AM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/MGG - 1827452 - Funded |
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Summary of Field Work: |
We propose a 40 day expedition to conduct a 2-D MCS seismic experiment of the Cascadia margin. A suite of 20 margin-crossing lines is planned spaced 50-100 km apart. Lines will be ~100-200 km long each and will extend as close to the shoreline as can be safely maneuvered (~15 km). The survey plan will also include one continuous strike line along the continental shelf. |
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Summary of Facility Requirements: |
The proposed study will make use of Langseth’s 15 km solid-state digital streamer and Langseth’s airgun array configured as a 6600 cu in tuned airgun array towed at 12m depth shot at a 37.5 m intervals. |
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Summary of other requirements and comments: |
Multibeam bathymetry, Knudsen 3.5 kHz sub-bottom profiler data, gravity and magnetics will be acquired throughout the survey, |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1009719 |
Created By: |
Suzanne M. Carbotte |
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Date Last Modified: |
3/27/2018 11:23:00 AM |
Date Submitted: |
3/27/2018 11:23:00 AM |
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Year: |
2020
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Ship/Facility: |
Marcus Langseth
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Optimum Start Date:
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6/1/2020 |
Dates to Avoid: |
September to May due to poor weather in this region |
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Earliest Start Date: |
6/1/2020 |
Multi-Ship Op: |
No |
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Latest Start Date: |
8/1/2020 |
Other Ship(s): |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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36 |
2 |
1 |
1 |
40 |
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: |
Cascadia SZ |
| Description of Op Area: |
Cascadia subduction zone from Mendocino to offshore Vancouver Island |
| Op Area Size/Dia.: |
660 |
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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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Show Degrees Minutes |
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Foreign Clearance Required? |
Yes |
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.) |
Canadian clearance will be required for the offshore Vancouver Island portion of the survey. Marine sanctuary permit may be required for the near shore portion of Washington margin lines. Marine mammal clearance will be needed for the expedition. |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Astoria, OR, USA |
None, |
Astoria, OR, USA |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
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Important Info on Working in Foreign Ports
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Chief Scientist: |
Suzanne M. Carbotte, LDEO |
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# in Science Party |
22 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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7 |
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Explanation of Science Party Requirements and Technician Requirements |
Not sure how many technicians will be required, but need full team for 2D long-streamer operations. |
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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. |
Need current capability of R/V Langseth to acquire long streamer deep penetration multi-channel seismic data. Also we plan to acquire multibeam bathymetry, gravity, magnetics and 3.5 kHz subbottom data.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
Need 15 km streamer and 6600 cu in tuned source array. |
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