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DESSC Annual Review San Francisco Marriott 5 December 2011

Servicing borehole observatories to run three-dimensional cross-hole perturbation and monitoring experiments, eastern flank of the Juan de Fuca Ridge. A. T. Fisher 1 , K. Becker 2 , C. G. Wheat 3 , J. F. Clark 4 , S. Cooper 5 , J. Cowen 6 , K. Edwards 7 , and the AT18-07 Shipboard Party.

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DESSC Annual Review San Francisco Marriott 5 December 2011

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  1. Servicing borehole observatories to run three-dimensional cross-hole perturbation and monitoring experiments, eastern flank of the Juan de Fuca Ridge A. T. Fisher1, K. Becker2, C. G. Wheat3, J. F. Clark4, S. Cooper5, J. Cowen6, K. Edwards7, and the AT18-07 Shipboard Party 1 University of California, Santa Cruz 2 University of Miami 3 University of Alaska Fairbanks 4 Univeristy of California, Santa Barbara 5 Consortium for Ocean Leadership 6 University of Hawaii 7 University of Southern California DESSC Annual Review San Francisco Marriott 5 December 2011

  2. Expedition AT18-07 Goals • Service seven CORK borehole observatories • Download downhole pressure data • Recover OsmoSampler systems, deploy new systems • Assess and retrofit old CORKs for pressure monitoring • Recover and redeploy long-term sampling/measurement sled • Collect large volume samples • Deploy autonomous flowmeter • Initiate long-term, cross hole discharge test

  3. All Expedition AT18-07 Goals Accomplished! • Service seven CORK borehole observatories • Download downhole pressure data • Recover OsmoSampler systems, deploy new systems • Assess and retrofit old CORKs for pressure monitoring • Recover and redeploy long-term sampling/measurement sled • Collect large volume samples • Deploy autonomous flowmeter • Initiate long-term, cross-hole discharge test

  4. Subseafloor borehole observatories (CORKs) • Seal reentry hole to prevent hydrologic contamination, allow return to pre-drilling P/T/Chemistry/MBIO conditions • Allow access to the subseafloor environment over long times, without drillship • Permit passive monitoring, facilitate active testing • Isolate multiple depth intervals Hundreds of meters Sounds like a lot of work... It is! But it’s worth the effort… modified from Fisheret al. (2011)

  5. Animation of CORK subseafloor observatories Created by Stephanie Keske, IODP Expedition 327 Department of Visualization, Texas A & M University

  6. Video from Atlantis/Jason Expedition AT18-07 CORK in Hole 1362B August 2011

  7. Acknowledgements Thank you! Collaboratiors: E. Davis, M. Hutnak, V. Spiess, G. Spinelli, H. Villinger, shipboard parties of ODP Leg 168, IODP Expeditions 301 and 327, numerous R/V Atlantis expeditions from 2004-11 WHOI National Deep Submergence Facility: Funding, leadership: IOs for ODP and IODP, crews and technicians of: J. Resolution, Atlantis, Thompson… Planning, field support:

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