georefid:2007-035100georefid:2007-035088SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.204.102.20062005-01-01publicationgeorefid:2007-035100doi:10.2973/odp.proc.sr.204.102.2006Tan, BrianMassachusetts Institute of Technology, Department of Civil and Environmental Engineering, Cambridge, MA, United StatesauthorGermaine, John T.Christian-Albrechts-Universitaet zu Kiel, Federal Republic of GermanyauthorFlemings, Peter B.Joint Oceanographic Institutions, United StatesauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Trehu, Anne M., Bohrmann, Gerhard, Torres, Marta E., Rack, Frank R., Bangs, Nathan L., Barr, Samantha R., Borowski, Walter S., Claypool, George E., Collett, Timothy S., Delwiche, Mark E., Dickens, Gerald R., Goldberg, David S., Gracia, Eulalia, Guerin, Gilles, Holland, Melanie, Johnson, Joel E., Lee, Young-Joo, Liu, Char-Shine, Long, Philip E., Milkov, Alexei V., Riedel, Michael, Schultheiss, Peter, Su Xin, Teichert, Barbara, Tomaru, Hitoshi, Vanneste, Maarten, Watanabe, Mahito, Weinberger, Jill L., Boetius, Antje, Brockman, Fred J., Deyhle, Annette, Fehn, Udo, Flemings, Peter B., Girguis, Peter R., Heesemann, Martin, Joye, Samantha B., Lorenson, Thomas D., Mills, Christopher T., Musgrave, Robert J., Popa, Radu, Ussler, Bill, Wilkes, Heinz, Winckler, Gisela, Winters, William J., Proceedings of the Ocean Drilling Program; scientific results; drilling gas hydrates on Hydrate Ridge, Cascadia continental margin; covering Leg 204 of the cruises of the drilling vessel JOIDES Resolution; Victoria, British Columbia, Canada, to Victoria, British Columbia, Canada; Sites 1244-1252; 7 July-2 September 2002204Eight whole-core samples from Ocean Drilling Program Site 1244, Hydrate Ridge, Cascadia continental margin, were provided to Massachusetts Institute of Technology (Cambridge, Massachusetts, USA) for geotechnical characterization. The samples were collected from depths ranging from 5 to 136 meters below seafloor (mbsf). Seven of the eight whole-core samples were located within the gas hydrate stability zone, whereas the eighth sample was located in the free gas zone. Atterberg limits testing showed that the average liquid limit of the soil is 81% and the average plastic limit is 38%, giving an average plasticity index of 43%. The liquid limit is sensitive to oven drying, shown by a drop in liquid limit to 64% when tests were performed on an oven-dried sample. Loss on ignition averages 5.45 wt%. Constant rate of strain consolidation (CRSC) tests were performed to obtain the compression characteristics of the soil, as well as to determine the stress history of the site. CRSC tests also provided hydraulic conductivity and coefficient of consolidation characteristics for these sediments. The compression ratio (C (sub c) ) ranges from 0.340 to 0.704 (average = 0.568). C (sub c) is fairly constant to a depth of 79 mbsf, after which C (sub c) decreases downhole. The recompression ratio (Cr) ranges from 0.035 to 0.064 (average = 0.052). Cr is constant throughout the depth range. In situ hydraulic conductivity varies between 1.5X10 (super -7) and 3X10 (super -8) cm/s and shows no trend with depth.completedOceanographyEngineering geologyCascadia subduction zoneconsolidationcontinental marginEast Pacificengineering propertiesexperimental studiesgrain sizeHydrate Ridgehydraulic conductivitylaboratory studiesLeg 204marine sedimentsNorth PacificNortheast PacificOcean Drilling ProgramODP Site 1244Pacific Oceansedimentssize distributionsoil mechanicsstrengthurn:org.iodp:exp:204urnlargerWorkCitationcampaignurn:org.iodp:exp:204:site:1244urnlargerWorkCitationstudyurn:org.iodp:exp:204urnlargerWorkCitationcampaignEnglishgeoscientificInformation-125.0700-125.070044.350044.3500Data report; available only on CD-ROM in PDF format and on the Web in PDF or HTML; includes appendicesapplication/pdfunknownSEDIS Publication Catalogue

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