Ship Request

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  Cascadia forearc  -  2021  -  Marcus Langseth  
  Project Information  
Project Title: Cascadia submarine forearc structure from multiscale controlled-source seismic data combining regional and focused large-N nodal arrays of multicomponent OBSs Project Status: Submitted
Principal Investigator: Juan Pablo Canales, WHOI Project Institution: WHOI
Project ID: 106396 Version #: 3
Date Submitted: 2/8/2019 8:00:00 PM Created By: Juan Pablo Canales
Date Last Modified: 3/16/2021 11:41:00 PM URI Serial #: None
Funding Agencies: NSF/OCE/MGG - 1929545 - Funded
Summary of Field Work: We propose to conduct a marine wide-angle seismic reflection/refraction survey of the Cascadia submarine forearc encompassing most of the length of the margin from southern Oregon to northern Vancouver Island. This survey will consist of the deployment of multicomponent OBSs and large-N ocean bottom nodal arrays that will record the controlled-source airgun signals of an NSF-funded seismic reflection survey of the Cascadia margin planed for Summer 2021 onboard R/V Langseth. The instrumentation will be deployed along ~half of the planed 2-D MCS profiles in advance of the Langseth MCS cruise, and recovered after the MCS cruise. The OBS and OBN arrays will sample the wavefields at different spatial scales, thus providing a multi-scale seismic dataset that is optimal for obtaining seismic P- and S-wave velocity models of the Cascadia forearc, from the abyssal plain near the deformation front to near the coast, at three complementary scales:

1. A margin-scale model (~100-km lateral resolution) encompassing most of the length of the subduction zone, from southern Oregon to northern Vancouver Is.

2. Regional, intermediate-resolution models ((~10-km lateral resolution) across 10 transects from the abyssal plain to the continental shelf evenly spaced along the full length of the margin.

3. Local, high-resolution models (hundreds-of-meters lateral resolution) across 3 transects representative of distinct forearc deformation regimes and known structural heterogeneities.

The survey we propose to conduct will consist of: (1) deployment and recovery (using a 3,000-m ROV from Pelagic Research Services) of 350 short-period, 4-component ocean bottom nodes leased from a commercial provider (inApril) at a nominal instrument spacing of 500 m along 3 profiles 30-90 km in length offshore Oregon; (2) deployment (free-fall) and recovery of 60 short-period, 4-component OBSs from the national instrumentation pool (OBSIC) at a nominal instrument spacing of 10 km along 6 profiles 70-150 km in length offshore Oregon; and (3) deployment (free-fall) and recovery of 55 short-period, 4-component OBS from the national instrumentation pool (OBSIC) at a nominal instrument spacing of 10 km along 4 profiles 100-130 km in length offshore Washington and Vancouver Island.
Summary of Facility Requirements: 1 Leg on RV Oceanus (4 mob + 28 science + 2 demob days: May 19-June 21, 2021) with ROV capabilities for node deployment/recovery. Deck space for ROV vans, and deck and wet lab space for node storage.

1 Leg on RV Oceanus (1 mob + 22 science + 1 demob days : June 22-July 15, 2021) for OBS deployment/recovery. Deck space for carrying 60 OBSs and over-the-side OBS deployment/recovery capabilities. Deck/lab space for 60 OBSs from OBSIC.

1 Leg on RV M.G. Langseth (2 mob + 5 science + 1 demob: May 22-29, 2021) for OBS deployment. Deck space for carrying 60 OBSs and over-the-side OBS deployment/recovery capabilities. Deck/lab space for 60 OBSs from OBSIC.
Summary of other requirements and comments: Scheduling of each leg will have to be coordinated with R/V Langseth's schedule for Summer 2021 for their MCS project (PI S. Carbotte).

Node (OBN) Deployments

We propose to deploy 350 ocean bottom nodes (OBNs) leased from inApril, a commercial provider of ocean bottom node-based seabed seismic surveys (

Due to its small, compact size, the units are not buoyant and lack anchor and self-release mechanisms, and therefore cannot be deploy by free-fall as the OBSIC OBSs do. Thus OBN deep-water surveys are routinely conducted using a remote-operated vehicle (ROV). Pelagic Research Services (PRS) will be providing the ROV support for this project.

We will conduct 1 deployment of 350 ocean bottom nodes:

- 179 nodes at 500-m spacing along a 89-km-long transect.
- 107 nodes at 500-m spacing along a 53-km-long transect.
- 64 nodes at 500-m spacing along a 32-km-long transect.

We propose a RV Oceanus 28-day cruise to deploy and recover the nodes using PRS' ROV. During the first 14 days we will deploy the 350 units in 10 ROV dives. The ROV will be fitted with a skid with capacity for 32 units, lowered to the seafloor, and towed at speed of 0.6 knots at an altitude of 5-10 m over the seafloor between deployment sites. After the 32 units have been deployed, we will retrieve the ROV, reload the skid with another 32 units, and send it back to the seafloor to continue the deployment. Nodes on the seafloor will start to record the Langseth airgun signals soon after deployment.

The last 14 days of the cruise will be to recover the nodes, following the same strategy.

OBS Deployments

We will conduct 2 deployments of short-period OBSIC instruments, resulting in a total of 115 drops:
(1) One deployment of 60 OBSs to instrument 6 transects offshore Oregon at 10-km spacing.
(2) A second deployment of 55 OBSs to instrument the 4 transects offshore Washington and Vancouver Is. at 10-km spacing.

The instruments to be used in these deployments will be short-period OBSs from the Ocean Bottom Seismograph Instrument Center (OBSIC). The OBSs will record the Langseth’s airgun shots.

OBS deployment/recoveries will be conducted in 2 separate legs and different ships:
- We are requesting the use of RV Langseth for a 5-day cruise to deploy 60 OBSs.
- We are requesting the use of RV Oceanus for a 22-day cruise to recover the 60 OBSs, re-deploy 55 OBS along the northern transects, and then recover the 55 OBSs.
Ship Request Identification
Type of Request: Primary Ship Use Request Status: Submitted
Request ID: 1010290 Created By: Juan Pablo Canales
Date Last Modified: 3/16/2021 11:41:00 PM Date Submitted: 2/8/2019 8:00:00 PM
Requested Ship, Operating Days and Dates
Year: 2021 Ship/Facility: Marcus Langseth
Optimum Start Date: 5/23/2021 Dates to Avoid: Weather window: summer.
Earliest Start Date: 5/23/2021 Multi-Ship Op: Yes
Latest Start Date: 5/23/2021 Other Ship(s): Ocean Bottom Seismometers (OBS) deployed from a ship suitable for OBS operations OBSs will record airgun signals from an MCS survey with R/V Langseth. Thus scheduling of the legs of this cruise will have to be coordinated with Langseth's Summer 2021 MCS survey off Oregon and Washington (PI S. Carbotte).

Operating Days Needed: Science Days Mob Days De-Mob Days Estimated Transit Days Total Days
5 2 1 0 8
Repeating Cruise?
(within same year)
No Interval:   # of Cruises:  

Description of Repeating cruise requirements: N/A
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations:
OBSs deployed from this ship will record airgun signals from an MCS survey with R/V Langseth. Thus scheduling of this cruise will have to be coordinated with Langseth's Summer 2021 MCS survey off Oregon and Washington (PI S. Carbotte).

We need one RV Langseth 5-science-days leg to deploy 60 OBSs prior to the MCS survey.
Work Area for Cruise
Short Description of Op Area
for use in schedules:
West coast
Description of Op Area: Offshore Oregon
Op Area Size/Dia.: 225 nm x 60 nm
  Lat/Long Marsden Grid Navy Op Area
42.1833° N / 124.25° W map
157 map
NP09 map
46° N / 126° W map
157 map
NP09 map
  Show Degrees Minutes    
Foreign Clearance and Permitting Requirements
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.)
This leg is all in US waters. Permits for deploying OBSs in Olympic marine sanctuary are being coordinated by Holly Smith at NSF in conjunction with permits for the RV Langseth Cascadia MCS survey.
Port Calls
Requested Start Port Intermediate Port(s) Requested End Port
Newport, OR, USA None, Newport, OR, USA
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops
Very convenient for the area of operations.

 Important Info on Working in Foreign Ports

Science Party
Chief Scientist: Nathan Miller, USGS-WH
# in Science Party 8 # of different science teams 1 # Marine Technicians to be
provided by ship operator:
(include in science party total)
Explanation of Science Party Requirements and Technician Requirements 2 science + 4 OBSIC + 2 Langseth techs.
Instrumentation Requirements That Impact Scheduling Decisions
Selected Dynamic PositioningUnselected ADCPUnselected MultibeamUnselected Seismic
Unselected Dredging/Coring/Large Dia. Trawl WireUnselected Stern A-frameUnselected Fiber Optic (.681)Unselected 0.680 Coax Wire
Unselected SCUBA DivingUnselected Radioisotope use - briefly describeUnselected NO Radioisotope use/Natural level workUnselected Other Operator Provided Inst. - Describe
0 PI-Provided Vans - briefly describe Unselected MOCNESS  
Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling.

The ship needs to be adequately equiped for OBS operations (deployment and
recovery) associated with 60 OBSs.

Major Ancillary Facilities (that require coordination of schedules with ship schedule)
Unselected Helicopter Ops (USCG)Unselected Twin OtterUnselected Unmanned Aerial Systems (UAS) 
Autonomous Underwater Vehicle (AUV)
Unselected Other AUVUnselected Sentry  
Coring Facility
Unselected Jumbo Piston CoringUnselected Large Gravity Core Unselected MC800 multicorer w/ MISO camera/telemetryUnselected OSU Coring Facility (MARSSAM)
Unselected Other Large Coring FacilityUnselected WHOI Long Core  
Human Occupied Vehicle (HOV)
Unselected AlvinUnselected Clelia (HBOI)Unselected JSL I & II (HBOI)Unselected Other HOV
Other Facility
Unselected MISO Facility - deep-sea imagingUnselected Other FacilityUnselected Potential Fields Pool Equipment 
Remotely Operated Vehicle (ROV)
Unselected JasonUnselected Other ROV  
Seismic Facility
Selected Ocean Bottom Seismograph Instrument Center (OBSIC)Unselected Ocean Bottom Seismograph Instrument Pool (OBSIP)Unselected Ocean-Bottom Seismometer Program (UTIG)Unselected Other Seismic/OBS Facility
Unselected PASSCALUnselected Portable MCS groupUnselected Portable MCS/SCS groupUnselected U.S. Geological Survey Ocean Bottom Seismometer Facility (USGS at WHOI)
Towed Underwater Vehicle
Unselected ARGO IIUnselected Hawaii MR1 (HMRG)Unselected IMI12 (HMRG)Unselected IMI120 (HMRG - formerly DSL 120A)
Unselected IMI30 (HMRG)Unselected Other Towed Underwater VehicleUnselected Towfish 
UNOLS Van Pool
Unselected AUV Lab Van #1Unselected Clean Lab VanUnselected Cold Lab VanUnselected General Purpose Lab Van
Unselected Radioisotope Lab VanUnselected Wet Lab Van  
UNOLS Winch Pool
Unselected Mooring SpoolerUnselected Portable WinchUnselected Turn Table 
Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems.
We are requesting 60 short-period OBSs from the OBS Instrumentation Center
equipped with 3-component seismometers and hydrophone.

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