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San Andreas MT
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2008
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New Horizon
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Project Title: |
Deep San Andreas Fault Boundary Structure from Marine Magnetotellurics |
Project Status: |
Submitted |
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Principal Investigator: |
Steven Constable, SIO |
Project Institution: |
SIO |
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Project ID: |
101369 |
Version #: |
3 |
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Date Submitted: |
12/21/2007 2:36:00 PM |
Created By: |
Steven Constable |
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Date Last Modified: |
8/8/2008 12:55:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
OTHER - Industry funding - Funded |
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Summary of Field Work: |
We will deploy 40 seafloor instruments and operate our EM transmitter from the New Horizon for the first leg, and then carry out a recovery cruise on the Sproul, reducing the total cost of the project. Transit to the deployment area at $121.5^{\circ}$W, $35^{\circ}$N from San Diego will require about 1.5 days time. During the first leg, we will deploy 40 EM receivers at an average rate of about 1-2 hours per instrument (3 days estimated) and tow SUESI (3 days). We will then transit back to San Diego and leave the EM receivers to record MT data undisturbed for 7-14 additional days. On the recovery cruise we will release instruments (10 minutes each), have an average rise time of 100 minutes (20~m/min in 2000~m water), and a transit time between stations of 20 minutes, to give an average recovery rate of 130 minutes per instrument, for a total recovery time of about 4 days. This is conservative -- if the next instrument along the line is within acoustic range, we may be able to halve this time and return early.
We have no particular constraints on the timing of the cruise. It would be nice to avoid the worst of the winter weather, since we will be operating outside the effect of Point Conception. |
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Summary of Facility Requirements: |
We will need a 0.680" electromechanical cable for our deeptow instrument. At this time we request the coaxial cable. It is possible that by the time this project is carried out, we will have upgraded our transmitter to use the fiber optic cable. |
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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: |
1001779 |
Created By: |
Steven Constable |
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Date Last Modified: |
1/15/2008 4:04:00 PM |
Date Submitted: |
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Year: |
2008
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Ship/Facility: |
New Horizon
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Optimum Start Date:
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6/1/2008 |
Dates to Avoid: |
No strong preference on time, but would prefer to avoid winter storms |
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Earliest Start Date: |
4/1/2008 |
Multi-Ship Op: |
No |
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Latest Start Date: |
11/1/2008 |
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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7 |
0 |
0 |
3 |
10 |
Repeating Cruise?
(within same year) |
Yes |
Interval: |
7-20 days |
# of Cruises: |
2 |
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Description of Repeating cruise requirements: |
We will want a recovery cruise on the Sproul about tow weeks after the deployment cruise on the NH. |
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: |
Central Calif. |
| Description of Op Area: |
Offshore central California, from coast to deep ocean |
| Op Area Size/Dia.: |
100 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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35° 30' N
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121° 0' W
map
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Ending
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34° 18' N
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122° 30' 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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San Diego, CA, USA |
None |
San Diego, CA, 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: |
Brent Wheelock, SIO |
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# in Science Party |
17 |
# 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 will be carrying out 24h deployments, but can probably manage with only one tech if Cambria Colt, in our science team, may |
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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. |
Right now we would need to use the 0680 coax, but may be ready to use the fiber optic cable before the cruise.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
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