|
|
Aleutian Megathurst
-
2011
-
Marcus Langseth
|
|
|
|
Project Title: |
Megathrust seismic hazards by reflection mapping |
Project Status: |
Submitted |
|
Principal Investigator: |
Donna J. Shillington, LDEO |
Project Institution: |
LDEO |
|
Project ID: |
101873 |
Version #: |
3 |
|
Date Submitted: |
2/6/2009 3:45:00 PM |
Created By: |
Donna J. Shillington |
|
Date Last Modified: |
7/14/2010 1:09:00 PM |
URI Serial #: |
None |
|
Funding Agencies: |
NSF/OCE/MGG - 0926614 - Funded |
|
Summary of Field Work: |
The objectives of this experiment are to image the reflection characteristics of the megathrust in the Aleutian/Alaska subduction zone in order to understand downdip changes in processes and physical properties at the slab interface. Seismic reflection data will be acquired along 5 profiles with two 8-km streamers and the 6600 cu in source of the Langseth. Wide-angle seismic refraction data will be acquired along two profiles with OBS spaced at ~15-16 km along two profiles to constrain crustal velocity structure. OBS acquisition would occur separately from MCS acquisition during the second half of the program. We propose to make a port call at Sand Point in the middle of the cruise to drop off MCS personnel and pick up OBS engineers. We estimate that the entire program including the stop and contingency time would require 33 days. |
|
Summary of Facility Requirements: |
For this project, we require the seismic capabilities of the R/V Langseth, as described above. |
|
Summary of other requirements and comments: |
|
|
|
Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
|
Request ID: |
1002692 |
Created By: |
Donna J. Shillington |
|
Date Last Modified: |
7/14/2010 1:09:00 PM |
Date Submitted: |
2/6/2009 3:45:00 PM |
|
|
Year: |
2011
|
Ship/Facility: |
Marcus Langseth
|
|
Optimum Start Date:
|
7/1/2011 |
Dates to Avoid: |
Given the region of the experiment (offshore Alaska), we would prefer to conduct the cruise in the middle of the summer if possible for best weather conditions. |
|
|
|
|
|
|
Earliest Start Date: |
6/1/2010 |
Multi-Ship Op: |
No |
|
Latest Start Date: |
8/31/2010 |
Other Ship(s): |
|
|
|
Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
|
30 |
0 |
0 |
3 |
33 |
Repeating Cruise?
(within same year) |
No |
Interval: |
|
# of Cruises: |
|
|
|
Description of Repeating cruise requirements: |
|
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
|
|
Short Description of Op Area
for use in schedules: |
Alaska, USA |
| Description of Op Area: |
Along Aleutian trench between Kodiak and Sand Point, Alaska |
| Op Area Size/Dia.: |
165000 nm2 area, 300 nm diameter |
|
|
| |
Lat/Long |
Marsden Grid |
Navy Op Area |
|
Beginning
|
|
|
|
|
Ending
|
|
|
|
| |
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.) |
|
|
|
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 |
We also request an intermediate port in Sand Point Alaska, which does not appear in the UNOLS port list. The purpose of this port call would be a personnel exchange (offload MCS personnel and bring OBS engineers onboard). |
Important Info on Working in Foreign Ports
|
|
|
|
Chief Scientist: |
Donna J. Shillington, LDEO |
|
# in Science Party |
13 |
# of different science teams |
2 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
|
1 |
|
Explanation of Science Party Requirements and Technician Requirements |
The scientific party comprises 4 scientists (Shillington, Nedimovic, Diebold, Webb) and 5 students. I've also included an estimated 3 OBS engineers in this total. |
|
 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 Langseth is the only ship that has the seismic capabilities required for our program. We plan to use 2 8-km-long streamers and the tuned air gun source of the Langseth.
|
|
|
|
Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
We have submitted a request to OBSIP for 21 short-period OBS. Our proposal calls for two deployments of all instruments. Although we propose to bring OBS engineers onboard at Sand Point, we propose to load OBS onto the ship at the beginning of the cruise in Kodiak unless the required OBS are onboard already from a previous program. |
|
