ABSTRACT
The Downward Compact Conical-ended Borehole Overcoring technique (Sakaguchi et al., 2003(a), 2003(b), 2004, 2006) is a stress-measurement method based on the Compact Conical-ended Borehole Overcoring (CCBO) technique (Sakaguchi et al., 1994; Sugawara & Obara, 1999). This stress-measurement technique can be applied to a water-filled vertical borehole to measure in-situ stress at great depth.
