Ikari, Matt J.; Knuth, Matthew W.; Marone, Chris; Saffer, Demian M. (2012): Frictional healing and compressibility of sheared sediment from fault zones, sites C0004 and C0007. IODP Management International, Washington, DC, United States, 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, 314/315/316, 1-19, georefid:2012-071774

Abstract:
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.
Coverage:
West: 136.4300 East: 136.4757 North: 33.1300 South: 33.0114
Relations:
Expedition: 314
Site: 314-C0004
Expedition: 316
Site: 316-C0004
Site: 316-C0007
Supplemental Information:
Data report
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2204/iodp.proc.314315316.219.2012 (c.f. for more detailed metadata)
Data download: application/pdf
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