Curved slickenfibers: a new brittle shear sense indicator with application to a sheared serpentinite

Paleostress inversion: A multi-parametric geomechanical evaluation of the Wallace–Bott assumptions

“…Furthermore, this basic hypothesis is also questionable, since Wallace and Morris (1986) and Tibaldi (1998) reported that observed geometrical complexity of fault surfaces and fault networks may induce heterogeneity in fault slip directions. Hancock (1985) and Petit (1987) studied evidences of local stress perturbations in microstructures, while others (Twiss and Geffel, 1990;Twiss et al, 1991;Pascal, 1998) observed block rotations along fault surfaces. Gapais et al, (2000) showed two examples of faulted regions to illustrate the spatial variability of fault-slip data either due to local complications at the edges of fault blocks, or to complex kinematic conditions at regional boundaries.…”

Paleostress field reconstruction in the Oslo region

“…All circular plots are lower-hemisphere, equal-area projections. a) Measured fault-slip data plotted in a tangent-lineation plot (Twiss and Gefell, 1990): each arrow represents one fault-slip datum; the centre of an arrow indicates the pole to the respective fault plane, while the arrowhead indicates the slip direction of the footwall block. b) Separation of fault-slip data according to clusters of PBT-axes.…”

Stability of the regional stress field in central Japan during the late Quaternary inferred from the stress inversion of the active fault data

“…Blue crosses denote the locations of outcrops, trench sites, and seismicreflection profiles from where the fault-slip data were collected. Focal-mechanism solutions for historical surface-rupturing earthquakes are also shown by Shiono [1977] and Kikuchi and Kanamori [1996]: 1891 Nobi, 1927Kita-Tango, 1945Mikawa, 1948Fukui, and 1995 [Twiss and Gefell, 1990], improved by Sato [2006], that display the fault attitude and possible slip directions of the complete and sense-only data. A complete datum is denoted by an arrow plotted by a lower-hemisphere, equal-area projection; the pole of the fault plane is depicted in the stereogram by the position of the arrow, which itself indicates the slip direction of the footwall block (Figure 2d).…”

“…The possible slip directions of the footwalls are constrained within the range indicated by the semicircle and quadrant drawn on the fault plane. (d-f) The fault-slip data expressed in tangent-lineation diagrams [Twiss and Gefell, 1990] improved by Sato [2006]. Figures 2d-2f correspond to Figures 2a-2c, respectively.…”