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S. Atlantic Seismic
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2016
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Marcus Langseth
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Project Title: |
Evolution of South Atlantic Oceanic Crust: A Seismic Transect |
Project Status: |
Submitted |
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Principal Investigator: |
Robert Reece, TAMU_CS |
Project Institution: |
TAMU_CS |
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Project ID: |
104453 |
Version #: |
6 |
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Date Submitted: |
8/5/2014 6:13:00 PM |
Created By: |
Robert Reece |
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Date Last Modified: |
7/15/2015 3:49:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/MGG - 1537108 - Funded |
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Summary of Field Work: |
A geophysical survey to characterize the fundamental structure and evolution of slow-spread oceanic crust with age, and the age range for oceanic crust layers to reach mature velocities. This survey will be the most comprehensive study of oceanic crust at any spreading rate (across a 70 myr age range) and will serve as a foundation for comparison to similar studies of intermediate and fast spreading crust. Additionally, this will serve as a site survey for a proposed IODP drilling transect (853-Pre), which has already been favorably reviewed by the IODP Science Evaluation Panel.
Work will consist of a 31 day geophysical survey split between multi-channel seismic (MCS) and ocean-bottom seismometer (OBS) deployments in the Southern Atlantic Ocean. The survey sites extend from just east of the Rio Grande Rise eastward to the Mid-Atlantic Ridge. We estimate 13.5 days of shooting on a 1550 km MCS profile with an 8 km streamer and 36-airgun array. In addition, there will be 5 OBS sites, each with 7 OBS. We estimate 12 days total to deploy, shoot, and recover OBS, plus 3.5 days to transit back along the profile. Transit to and from port is additional. 2 contingency days are planned. |
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Summary of Facility Requirements: |
8 km hydrophone streamer; airgun array; A-frame/crane with winch for OBS deployment/recovery; dry lab space for OBS assembly; dry lab space for OBS storage; deck space for OBS anchor storage. |
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Summary of other requirements and comments: |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1007143 |
Created By: |
Robert Reece |
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Date Last Modified: |
2/7/2015 5:02:00 PM |
Date Submitted: |
8/5/2014 6:13:00 PM |
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Year: |
2016
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Ship/Facility: |
Marcus Langseth
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Optimum Start Date:
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5/1/2016 |
Dates to Avoid: |
Requested ship dates provided just as a starting point; not firm for any reason. |
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Earliest Start Date: |
1/1/2016 |
Multi-Ship Op: |
No |
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Latest Start Date: |
11/1/2016 |
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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31 |
1 |
1 |
9 |
42 |
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: |
South Atlantic |
| Description of Op Area: |
One main transect in the S. Atlantic from Rio Grande Rise off the coast of Brazil to the mid-Atlantic Ridge. |
| Op Area Size/Dia.: |
~810nm E-W; 27nm to N & S at 5 sites on profile |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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30.95424° S
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27.54342° W
map
30° 57.2544' S
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27° 32.6052' W
map
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Ending
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30.21482° S
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15.09177° W
map
30° 12.8892' S
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15° 5.5062' W
map
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Show Degrees Minutes |
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Foreign Clearance Required? |
No |
Coastal States:
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 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.) |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Santos, Brazil |
None |
Santos, Brazil |
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: |
Robert Reece, TAMU_CS |
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# in Science Party |
19 |
# 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 |
We anticipate 9 science party members from TAMU and UTexas, and this is the number listed above. We will also have a team from OBSIP for OBS ops- number unknown. Ship operator science party members should include those required for 2D MCS operations- number unknown. |
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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. |
We will request 2D MCS operations with an 8 km streamer.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
We have a request in with OBSIP for 5 deployments each of 7 short period OBS. |
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