Woods Hole Oceanographic Institution

Cruise Planning Synopsis

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AT42-20: GoFar TF Earthquakes


R/V Atlantis

Cruise Party

Mark Behn: Principal Investigator
Woods Hole Oceanographic Institution Clark 260B, MS#22 Woods Hole, Ma. USA 02543
+1 508 289 3637

John Collins: Chief Scientist, Principal Investigator
Organization Name USA
+1 508 289 2733

Wenyuan Fan: Principal Investigator
Florida State University USA
+1 850 644 6265
Wenyuan Fan

Jessica Warren: Principal Investigator, Chief Scientist
University of Delaware 255 Academy Street Newark, DE USA 19716
+1 302 831 8229

Departure: Nov 16, 2019

San Diego, USA

Arrival: Dec 12, 2019

Manzanillo, Mexico

Operations Area

Gofar-Discovery-Quebrada Transform Faults, EPR
Lat/Lon: 4° 0.0′ S / 105° 0.0′ W
Depth Range: 2500 / 5000
Will the vessel be operating within 200 NM of a foreign country? no

Science Objectives

The expedition consists of two activities:

  1. Deployment of 51 OBS instruments on the Gofar Transform Fault. Deployments will occur for 16hrs per day and will take 11 days. The instruments will be left out for one year as part of a two year deployment.
  2. Dredging at night (8hr) during the OBS deployment period, followed by 3 days of round-the-clock dredging. Dredging will be on Gofar, Discovery and Quebrada Transform Faults, starting in the area 106W, 4.6S and ending in the area 103W, 3.5S.

Science Activities

  • Deployment of OBS instruments.
  • Sampling via dredging.
  • On board analysis of rocks, including cutting and describing.
  • High-resolution multibeam to be collected when possible.


Additional Info

Pre-cruise Planning Meeting: Teleconference/Visit WHOI
Meeting Notes: Jessica Warren and John Collins will attend in person. Mark Behn may attend in person. The project lead, Margaret Boettcher, will call in from Australia (GMT+8). Our preferred meeting time is 9am to accommodate time zones.


  Gofar 1E, M6 Zone
  Distance: null
  Days: 6
  Latitude: 4° 30.0’ S
  Longitude: 104° 65.0’ W

  Gofar 3, Foreshock Zone
  Distance: 60
  Days: 5
  Latitude: 4° 33.0’ S
  Longitude: 106° 0.0’ W

  Distance: null
  Days: 3
  Latitude: 3° 30.0’ S
  Longitude: 103° 0.0’ W

Supporting documentation:



Funding Agency: NSF
Grant or contract number: 1832830
Funding Agency: NSF
Grant or contract number: 1833279
Funding Agency: NSF
Grant or contract number: 1832868
Funding Agency: NSF
Grant or contract number: 1832164

Scientific Instrumentation for R/V Atlantis

Other Science Vans:

Shipboard Equipment

Bathymetry System 12 kHz
Sippican XBT System (Mark 21)
12 kHz Pinger for Wire Use
Transponder Navigation - Sonardyne USBL
Navigation - Heading
Transducer well for visiting instrumentation
Navigation - Position

Shipboard Communication

Basic Internet access via HiSeasNet
Is there an expectation to use Skype or any other real-time video conference program?

CTD/Water Sampling

911+ Rosette 24-position, 10-liter bottle Rosette with dual T/C sensors
SBE43 oxygen sensor

Critical CTD Sensors

Sediment Sampling

Gravity corers
Rock dredges
Storage Notes: We will store rock samples on deck in wire baskets. The 6 baskets will be provided by WHOI.


Will you be using Long Base Line (LBL) navigation? no
How many nets? null
How many tansponders? null
Will you be using Ultra-short baseline (USBL) navigation?no


Navigation Notes:

We will be using Ultra-short baseline (USBL) navigation for other than Alvin operations. (This question appears in the pdf created from this form, but the question is not available to answer on the form itself.)


Trawl Winch with 9/16th trawl wire
CTD Winch with .322" Electro-mechanical wire
Winch Notes: CTD winch will be used for OBS lowering.
Trawl winch will be used for dredging.
Need swivel for dredge.
Traction winch required for dredging.
Need 3 WHOI rock dredges.
Lee Ellett (SIO) is sending 3 SIO rock dredges with weaklinks.
We need 2 x 12 kHz Pinger for wire use (1 ready spare).
We would like confirmation of the condition of the winch ahead of the cruise. How recently has it been used? Where there any issues?

Wire use and application

CTD Winch with .322" Electro-mechanical wire
Winch Notes: We would like to confirm the condition of the wire:
What is the wire age?
When was the wire last pull tested?
When was the wire last unspooled to a seafloor depth of 5000 m, the maximum depth for our dredging?
Is the level wind working?

Standard Oceanographic Cables

Slip ring required? no
Non-standard wire required? no
Traction winch required? no
Science Van 1
Type/size: OBSIC Van Location:
Water: Power:

Specialized Deck Equipment

Mooring Deployment/Recovery Equipment Required: no Type: 
Cruise Specific Science Winch Required: no Type: 
Nets Required: no Type: 

Over the Side Equipment

Will you be bringing any equipment (winches, blocks, etc.) that lowers instruments over the side? no

Special Requirements

Elecrical Power: yes Identify Rock saw on deck
Equipment Handling: no Identify: 
Inter/intraship Communications: no Identify: 
Science Stowage: yes Identify: Stowage of equipment and samples to Panama or other safe port
Water: no Identify: 

Additional Cruise Items/Activities

Explosive Devices:no Portable Air Compressors:no Flammable Gases:no Small Boat Operations:no SCUBA Diving Operations:no

Hazardous Material

Will hazardous material be utilized?noDescribe deployment method and quantity:

Radioactive Material


Additional Information

Is night time work anticipated on this cruise?yesSpecialized tech support (Seabeam, coring, other):
Dredging operations will be conducted at nighttime. OBS deployments may be conducted at night.
We have requested a UNOLS dredging technician and bosun support for nighttime deck operations.Other required equipment and special needs:
Two rock saws, with spare blades and pumps.

Checklist & Notes


U.S. Customs Form: no
Diplomatic Clearance: no
Date Submitted:
Date Approved:
Agent Information:
Isotope Use Approval: no
Isotope Notes:
SCUBA Diving: no


SSSG Tech: