Ikari, Matt J. et al. (2012): Frictional healing and compressibility of sheared sediment from fault zones, sites C0004 and C0007

Leg/Site/Hole:
IODP 316
IODP 314 C0004
IODP 316 C0004
IODP 316 C0007
Identifier:
2012-071774
georefid
10.2204/iodp.proc.314315316.219.2012
doi
Creator:
Ikari, Matt J.
Pennsylvania State University, Department of Geosciences, University Park, PA, United States
author
Knuth, Matthew W.
University of Wisconsin at Madison, United States
author
Marone, Chris
Ecole Nationale Supeieure de Geologie, France
author
Saffer, Demian M.
Chungnam National University, South Korea
author
Identification:
Frictional healing and compressibility of sheared sediment from fault zones, sites C0004 and C0007
2012
In: Kinoshita, Masataka, Tobin, Harold, Thu, Moe Kyaw, Gaillot, Philippe, Bourlange, Sylvain, Chang, Chandong, Conin, Marianne, Gulick, Sean, Rodriguez, Maria Jose Jurado, Martin, Kylara M., McNeill, Lisa, Miyakawa, Ayumu, Moore, J. Casey, Nakamura, Yasuyuki, Saito, Saneatsu, Sawyer, Dale S., Tudge, Joanne, Yamada, Yasuhiro, Ashi, Juichiro, Lallemant, Siegfried, Masago, Hideki, Behrmann, Jan H., Boeckel, Babette, Byrne, Timothy, Calves, Gerome, Famin, Vincent, Guo, Junhua, Hashimoto, Yoshitaka, Hayashi, Hiroki, Henry, Pierre, Hirono, Tetsuro, Hulme, Samuel M., Kaksonen, Anna Henriikka, Kanagawa, Kyuichi, Kanamatsu, Toshiya, Kopf, Achim, Lewis, Jonathan C., Likos, William John, Pares, Josep Maria, Saito, Hiroyuki, Schmidt-Schierhorn, Friederike, Tomaru, Hitoshi, Underwood, Michael, Zhu, Wen-Lu, Kimura, Gaku, Screaton, Elizabeth J., Curewitz, Daniel, Chester, Frederick, Fabbri, Olivier, Fergusson, Chris, Girault, France E., Goldsby, David, Harris, Robert, Inagaki, Fumio, Jiang, Tao, Kitamura, Yujin, Knuth, Matthew W., Li Chun-Feng, Liljedahl, Lillemor Claesson, Louis, Laurent, Milliken, Kitty, Nicholson, Uisdean, Riedinger, Natascha, Sakaguchi, Arito, Solomon, Evan, Strasser, Michael, Su Xin, Tsutsumi, Akito, Ujiie, Kohtaro, Yamaguchi, Asuka, Zhao, Xixi, Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 1; investigations of seismogenesis, Nankai Trough, Japan; Expeditions 314, 315, and 316 of the riser drilling platform from and to Shingu, Japan; Sites C0001-C0006, 21 September-15 November 2007; and Sites C0001 and C0002, 16 November-18 December 2007; and Sites C0004 and C0006-C0008, 19 December 2007-5 February 2008
IODP Management International, Washington, DC, United States
314/315/316
1-19
We conducted shearing tests on samples spanning key fault zones recovered from Integrated Ocean Drilling Program (IODP) Sites C0004 and C0007 from Expedition 316 to the Nankai Trough offshore Japan. Results of slide-hold-slide and normal stress stepping procedures allow quantification of frictional healing, time-dependent compaction, and compressibility of sheared gouge layers. Samples were sheared as thin layers in the double-direct shear configuration at 25 degrees C in a true-triaxial pressure vessel at constant effective normal stress of 25 MPa and pore pressure of 5 MPa using a water-based brine saturated with 3.5 wt% NaCl. We monitored the poromechanical drainage state during shear by holding the pore pressure at the upstream end of the sample at 5 MPa while monitoring the downstream pore pressure. Friction constitutive behavior was determined using slide-hold-slide tests in which hold times ranged from 1 to 1000 s. Frictional healing rates range from approximately 0.003 to 0.008 per decade, with slightly higher rates measured for samples from Site C0004 than from Site C0007. Both sites exhibit similar compaction rates of approximately 0.002-0.007 per decade during holds. Both frictional healing and compaction correlate very well with the logarithm of hold time, with R (super 2) > 0.95. For Site C0004 samples, compressibility was found to be approximately 1-4 GPa (super -1) . At Site C0004, compaction rates and compressibility are elevated in the vicinity of the fault zone. At Site C0007, healing rates decrease, and compaction rates increase, with increasing depth.
English
Serial
Coverage:Geographic coordinates:
North:33.1300
West:136.4300East: 136.4757
South:33.0114
Engineering geology; Asia; boreholes; compaction; compressibility; continental margin; cores; elastic constants; Expedition 316; experimental studies; Far East; friction; Honshu; Integrated Ocean Drilling Program; IODP Site C0004; IODP Site C0007; Japan; Kii Peninsula; laboratory studies; marine sediments; mechanical properties; Nankai Trough; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; rates; sediments; shear stress; shear tests; soil mechanics; West Pacific; Young's modulus;
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