AT26-04

Ship

Vehicles

Cruise Party

Departure: Jul 31, 2013

Arrival: Aug 26, 2013

Operations Area

Science Objectives

We propose to conduct a comprehensive study of the thermal environment of the Cascadia Subduction Zone (CSZ) within the NSF GeoPRISM Corridor off the Washington margin.   The primary goal of this study is to determine the temperature structure of Juan de Fuca basement and overlying accretionary prism sediments that comprise the CSZ deformation zone with a transect of systematic heat flow and fluid flux profiles off the Washington Coast.  Temperature is a primary controlling factor of many subduction zone processes, particularly at active margins that are subject to large magnitude, megathrust earthquakes as the CSZ offshore WA, and a comprehensive heat flow study of the Cascadia Corridor is a fundamental parameter required by the Scientific Plan of the GeoPRISM Program.  Compilation of existing data demonstrate that the segment of the CSZ off-shore WA is dramatically under-measured, with only sparse heat flow stations made during programs focused on other scientific goals.  We are proposing to acquire a systematic profile of heat flow and fluid flux measurements along a corridor of the accretionary prism on the Washington margin at 47°N, from west of the deformation front on the abyssal plain to just below the shelf edge at 500 m depth – in order to make the first quantitative estimates of the thermal structure of the ‘locked zone’ of the Cascadia megathrust.  To obtain an accurate estimate of conductive heat flux from the challenging environment of the accretionary prism, we plan redundant methods to obtain both thermal and fluid flux measurements along a 2.5 D profile of the margin at a single latitude. In this profile we would use thermal blankets suitable for impenetrable sub-stratum, continuous fluid flow meters, multi-core deployments for sediment pore water chemistry and thermal gradient measurements, and Jason-II heat flow probes. 

Science Activities

1. Jason II dives along the WA margin, which will deploy 14 thermal blankets and 11 fluid flux meters sequentially at 12 stations along the 100 km length of the survey area (see map).   Jason II activities include (a) thermal blanket deployments and recoveries, (b) methane fluid flux instrument deployment and recoveries, (c) Jason thermal probe measurements, (d) Jason video survey using brow cam and HD cameras, (e) Jason hull-mounted CTD measurements, and (f) small bio-box mounted on Jason
2.  Additional Jason Equipment needed; TWO working elevators, to transport equipment to/from seafloor

 3. ATLANTIS equipment needed.  EM122 swath bathymetry system with ability to measure bathymetry, acoustic backscatter, and water column images.    3.5 kHz Knudsen sounder system with ability to download and exam data in real time on cruise.   CTD with 24 bottle water sampling rosette.   Winch/wire capable of deploying OSU heat flow probe and OSU multi-corer between Jason dives.

Additional Info

Stations:

Supporting documentation:

Shipboard Equipment

Shipboard Communication

CTD/Water Sampling

Critical CTD Sensors

MET Sensors

Sediment Sampling

Sample Storage

Navigation

Wire use and application

Standard Oceanographic Cables

Portable Vans

Specialized Deck Equipment

Over the Side Equipment

OSU may/may not need to bring a small tool van; I am discussing with them about the possibility (if deck space is tight) the possibility of leaving van on Astoria dock.

Special Requirements

Additional Cruise Items/Activities

Hazardous Material

Radioactive Material

Additional Information

OSU coring technician will be part of science party.

):  multibeam surveys, multi-corer, gravity coring, heat flow probe

OSU may/may not need to bring a small tool van; I am discussing with them about the possibility (if deck space is tight) the possibility of leaving van on Astoria dock.

Site Survey

Navigation

Elevators

Science Supplied Equipment

Thermal blankets, deployed.  Fluid flux meters, deployed.

 August, 2011 Atlantis/Jason II cruise to Endeavour Ridge.

Fluid flux meters are ambient pressure.   Data loggers are rated >4000 meters and use previously on Jason.    

Checklist

Master R/V ATLTANTIS
Attn: Scientist's Name - AT26-04
c/o Vasile Tudoran Transport
819 Ohio Ave.
Long Beach, CA 90804

Contact: Vasile Tudoran
Phone: (562) 882-5590
Fax: (562) 434-9800
Email: vtudoran@aol.com


**NOTE:  All packages and shipments should be sent to the following address with shipping notification sent to WHOI contacts, Ship's Agent and Esther Jones, contact information below:

Herb Florer, Director, Seaports Division
(503) 741-3336 (office)
(503) 468-8182 (cell)
herb@portofastoria.com

 Esther Jones, Administrative Assistant
(503) 741-3300 (Office)
admin@portofastoria.com

 Port of Astoria Tel:  (503) 741-3300

Master R/V Ship Name
Attn: Scientist's Name
c/o Port of Astoria
#10 Pier One
Suite 308
Astoria, OR   97103


Note: Agent and WHOI contacts should be copied on all communications.  It is requested that shipment information of any equipment be communicated to the Agent and WHOI contacts

Checklist