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Project Title: |
Alaska Amphibious Community Seismic Experiment (AACSE) |
Project Status: |
Submitted |
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Principal Investigator: |
Geoffrey Abers, Cornell |
Project Institution: |
Cornell |
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Project ID: |
105386 |
Version #: |
11 |
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Date Submitted: |
7/22/2016 12:42:00 PM |
Created By: |
Geoffrey Abers |
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Date Last Modified: |
7/30/2019 2:56:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/MGG - 1654568 - Funded |
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Summary of Field Work: |
AACSE is a shoreline-crossing community seismic experiment around the Alaska Peninsula. The Alaskan Peninsula was identified as a top priority site to address questions fundamental to GeoPRISMS and EarthScope goals at the recent Amphibious Array Facilities Workshop. The GeoPRISMS primary site work, deployment of TA stations in Alaska and the availability of a large pool of both shallow and deep water instruments following the Cascadia Initiative present a unique opportunity to advance understanding of the fundamental solid-earth systems. This proposal, developed through open invitations and public review, funds data collection and rapid release to the community in response to a recent NSF Dear Colleague Letter of March 2016.
The deployment will include 75 broadband OBS instruments and 30 broadband land instruments, recording for 15 months in 2018-19. The array includes a dense transect in the Kodiak/Katmai region from the far outer rise to the distal backarc, covering the megathrust in between. The OBS instruments include 20 shielded sensors intended for deployment in shallow water, on the shelf south of the Alaska peninsula. All shallow-water instruments and approximately nine deepwater instruments will include Absolute Pressure Gauges, will five OBSs and six land sites will include accelerometers, all to capture large local earthquakes without clipping and possible slow slip events. Deep-water instruments will be concentrated on the inner slope between shelf and trench from Kodiak to past the Shumagin Islands, or will be distributed south on the Pacific Plate within 300 km of the trench. Instruments are provided by OBSIP, from multiple instrument centers (LDEO, WHOI).
NSF indicates likely ship availability for the necessary global-class ships in May-June 2018 for the deployment cruise, and Aug-Sep 2019 for the recovery cruise, and we plan our deployment accordingly. OBSIP anticipates two deployment cruises of 19 and 20 days in 2018, with ports of Dutch Harbor and Kodiak, and two 14-day recovery days in 2019 with the same ports, provided global-class ships are available. The 25 shallow-water instruments would be the LDEO TRM design and sufficient deck space is needed to deploy these in 50-250 water depth, to be lowered by heave-compensated winch. Part of the OBSIP support includes adding redundant pop-up buoys which should make all OBS’s recoverable from ship without needing ROV’s. We expect TRM recovery to be comparable to successful popup recoveries in Cascadia.
Each cruise will be staffed by two PIs in addition to the regular OBSIP and technical support staff. Also, we plan open Apply-to-sail programs to fill 7 berths in each cruise with graduate students, postdocs or faculty with little OBS experience, teachers and science writers. One of the 2019 cruises would have an undergraduate-focused Apply-to-sail program, making use of 11 berths. |
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Summary of Facility Requirements: |
The deployment and recovery of the 75 OBS for a 15 month period will each require two cruises, four total. We propose to deploy and recover the OBS using a global-class vessel available on the west coast. The Sikuliaq is a viable option. We require a vessel with sufficient deck space to accommodate up to 45 OBS’s and in particular the 20 TRM’s. We require dry/wet lab space for staging the instruments. To deploy the TRM’s we require addition of a heave-compensated winch, with a large crane or A-frame for deploying and recovering instruments, and JASON for recovery. Multibeam capability will greatly facilitate successful siting of many OBS's and provide important ancillary data. |
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Summary of other requirements and comments: |
Timing of these two cruises needs to be coordinated with OBSIP instrument and support availability. Our deployment plan relies on OBS deployment for two summers and the intervening winter, so late spring 2018 (May) is needed for the first deployment cruise. That timing would necessitate the two recovery cruises take place in August-September 2019. Later years are also not feasible because this project is designed to be synchronous with the deployment of the onshore EarthScope Transportable Array in Alaska, 2017-2019. |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1008672 |
Created By: |
Geoffrey Abers |
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Date Last Modified: |
7/30/2019 2:56:00 PM |
Date Submitted: |
7/22/2016 12:42:00 PM |
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Year: |
2019
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Ship/Facility: |
Global
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Optimum Start Date:
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8/26/2019 |
Dates to Avoid: |
Second of 2 cruises to recover OBS's in 2019 summer Alaska weather window. These OBSs are deployed in July 2018 and operate 14-15 months, so this late date maximized data recovery. |
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Earliest Start Date: |
7/21/2019 |
Multi-Ship Op: |
No |
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Latest Start Date: |
9/10/2019 |
Other Ship(s): |
Global or Sally Ride - good deep-water bathymetry |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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16 |
1 |
2 |
1 |
20 |
Repeating Cruise?
(within same year) |
No |
Interval: |
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# of Cruises: |
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Description of Repeating cruise requirements: |
Weather, OBS battery lifetime, and coordination with onshore seismology deployments. Specifically, these OBSs are to be deployed July 2018 and have up to 15 months battery life; given the Alaska weather window a mid-late Sept 2019 recovery is requested. |
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
Ship choice: need deck space for up to 30 broadband OBS and support, space for OBS recovery. Need multibeam capable of deep-water operation.
Dates/Coordination: OBS battery life is 14-15 months. These OBSs are to be deployed July 2018 and have up to 15 months battery life; given the Alaska weather window a mid-late Sept 2019 recovery is requested.
Number of days: Based on OBSIP estimate and assumption of Kodiak-Kodiak ports. Additional 2 days included to allow multibeam mapping in deep water, which was unavailable in earlier cruises. |
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Short Description of Op Area
for use in schedules: |
Alaska Penin. |
| Description of Op Area: |
South of Alaska Peninsula, Kodiak to Cold Bay, 150W to 161W, including all of shelf and extending 250 km south of trench. |
| Op Area Size/Dia.: |
400 nm x 250 nm |
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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? |
No |
Coastal States:
US EEZ |
 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.) |
OBSIP handles |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Kodiak, AK, USA |
None |
Kodiak, AK, USA |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
This cruise recovers OBS's that are in deep water off Kodiak and the Alaska Peninsula. Kodiak is closest to array and minimizes transit. Seward is used for 2018 deployment legs and has easy access for shipping, it would would increase transit by 1 day. |
Important Info on Working in Foreign Ports
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Chief Scientist: |
Geoffrey Abers, Cornell |
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# in Science Party |
16 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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2 |
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Explanation of Science Party Requirements and Technician Requirements |
Party: Party: 2 chiefs (chief: Abers, co-chief: P. Haeussler); 7 apply-to-sail participantst, 6 OBSIP techs, 2 ship techs. Other tech's should include 2 for 24 hr crane operations, depending on ship policy. |
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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. |
OBSIP. OBSIP will provide more details on needs.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
Cruise 2 recovers 30 broadband OBS's so requires full OBSIP support. Need multibeam for site resurvey. |
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