|
|
Aleutian GPSA
-
2018
-
Sally Ride
|
|
|
|
Project Title: |
Collaborative Research: Measuring strain along the Aleutian subduction zone trench to better constrain seismic and tsunami hazard |
Project Status: |
Submitted |
|
Principal Investigator: |
Spahr C. Webb, LDEO |
Project Institution: |
LDEO |
|
Project ID: |
105412 |
Version #: |
4 |
|
Date Submitted: |
8/4/2016 12:15:00 PM |
Created By: |
Spahr C. Webb |
|
Date Last Modified: |
1/4/2021 9:03:00 PM |
URI Serial #: |
None |
|
Funding Agencies: |
NSF/OCE/MGG - 1656413 - Funded |
|
Summary of Field Work: |
We will deploy 9 transponders for GPSA measurements to measure strain accumulation at three sites south of the Aleutian Peninsula. A waveglider system will be used to survey the transponders on the seafloor. The transponders will be recovered two years later. We will deploy a waveglider twice to determine the exact position of the sites two years apart to measure the rate of strain accumulation across the Aleutian subduction zone to better constrain seismic tsunami risk. |
|
Summary of Facility Requirements: |
We require several CTD casts and a crane to lift the transponders, waveglider and benchmarks over the side of the ship and to recover the transponders and waveglider at the end of the deployment. We require a multibeam sonar to place the transponders onto appropriate sea floor regions. |
|
Summary of other requirements and comments: |
We originally specified the Sikuliaq because it is ported in Alaska, but any ship with crane, CTD and multibeam sonar would work.
The first year GPSA deployments can be done in conjunction with the Alaska OBS community experiment during the deployment leg for the LDEO OBSs by adding three days to this leg. This assumes the R/V Sally Ride or larger ship is used. |
|
|
Type of Request: |
Collaborative Ship Use |
Request Status: |
Submitted |
|
Request ID: |
1008758 |
Created By: |
Spahr C. Webb |
|
Date Last Modified: |
9/9/2020 12:19:00 AM |
Date Submitted: |
8/4/2016 12:15:00 PM |
|
|
Year: |
2018
|
Ship/Facility: |
Sally Ride
|
|
Optimum Start Date:
|
6/15/2018 |
Dates to Avoid: |
Need to deploy the transponders on the seafloor early enough in the weather year to permit a one month long waveglider deployment in good weather. |
|
|
|
|
|
|
Earliest Start Date: |
6/1/2018 |
Multi-Ship Op: |
No |
|
Latest Start Date: |
7/15/2018 |
Other Ship(s): |
Assume Sally Ride or larger ship for operations to be conducted on same leg as OBS deployments for Alaska Community experiment during LDEO OBS deployment leg. |
|
|
Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
|
3 |
0 |
0 |
0 |
3 |
Repeating Cruise?
(within same year) |
No |
Interval: |
|
# of Cruises: |
|
|
|
Description of Repeating cruise requirements: |
GPSA deployment to be conducted during the LDEO OBS deployment of the Alaska OBS community experiment NSF proposal OCE-1654568 Adds three days to cruise leg. |
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
Cruise needs to be an earlier enough in the summer to permit a month long waveglider deployment in good weather after the transponder deployments (starting at the end of deployment cruise). The waveglider will be recovered using a small fishing vessel about one month after the cruise. A different ship from the Sikuliaq could be used for this cruise. |
|
Short Description of Op Area
for use in schedules: |
SW Alaska |
| Description of Op Area: |
South of the Aleutian peninsula between Sanak Islands and Kodiak. |
| Op Area Size/Dia.: |
150 |
|
|
| |
Lat/Long |
Marsden Grid |
Navy Op Area |
|
Beginning
|
54° 42' N
/
156° 30' W
map
|
|
|
|
Ending
|
54° 0' N
/
160° 18' W
map
|
|
|
| |
Show Degrees Minutes |
|
|
|
|
|
Foreign Clearance Required? |
No |
Coastal States:
|
 Important Info on Foreign Research Clearances
|
|
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)?
|
No |
If yes, have you applied for the necessary permits through your export control office?
|
No |
| Questions about ITAR/EAR regulations?
|
Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.) |
No special clearances required. |
|
|
Requested Start Port |
Intermediate Port(s) |
Requested End Port |
|
Kodiak, AK, USA |
None |
Kodiak, AK, USA |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
Kodiak is the closest port to the working area with airport and good shipping. |
Important Info on Working in Foreign Ports
|
|
|
|
Chief Scientist: |
Spahr C. Webb, LDEO |
|
# in Science Party |
6 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
|
1 |
|
Explanation of Science Party Requirements and Technician Requirements |
only require crane, CTD operator and multibeam. |
|
 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 | | |
|
Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling. |
The work will involve wireline deployment of 9 GPSA transponder benchmarks on seafloor near trench, but in less than 3000m of water at three sites. After each set of three transponders is deployed, we will deploy a waveglider system for a period of time to survey in benchmarks, or else use a ship board system to survey in benchmarks. Expect each site to require one full day of operations. Transit between sites will be part of OBS deployment operations.
|
|
|
|
Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
N/A |
|
