One set is approximately horizontal with evenly spaced bedding planes with a
dip angle varying slightly with the survey sites (basically maintained within 0[degrees]~5[degrees]) and the interlayer spacing is approximately 1.0 m, whereas the other set points to the foot of the north slope and inwards to the south slope with the
dip angle and interlayer spacing varying significantly.
Step I: A model frame system is built, and two steel strips with 2 mm thickness, 50 mm width, and 1800 mm length are installed to assure the
dip angle of faults (Fig.
The pole of intersection point of the joints lies within the friction cone or safe region because the
dip angle of [J.sub.1] is very small.
When the
dip angle of macrospores is low, the cohesion depends on the sliding friction of the fine-grained soil.
In fact, both the fixed boundary conditions at the bottom and rolling conditions at the side of the hanging wall were changed to moving boundary conditions composed of horizontal and vertical displacement with the assumed fault
dip angle, see Figure 1.
Several studies have shown that this subduction zone may exhibit lateral variations in the
dip angle of the subducted oceanic lithospere as well as changes in the distribution of seismicity along and down dip the trench, specially at intermediate depths (between the latitudes 3[degrees]N-4[degrees]N), where a seismic gap is apparent (Pennington, 1981; Taboada et al., 1998; Monsalve, 1998; Gutscher et al., 1999, Vargas et al., 2003, Mejia and Meyer, 2004, Chicangana and Vargas, 2004).
where [alpha] is the dip direction, [beta] is the
dip angle, [DELTA][alpha] is the cell size on dip direction, [DELTA][beta] is the cell size on
dip angle (Figure 2), [P.sub.A] is the corrected frequency in cell, [p.sub.AB] ([alpha], [beta]) is the joint probability density that the dip direction and
dip angle are intersected by scanline, and P is the observed frequency in cell.
The configuration of the tunnel, fault rupture, boundary conditions, and fault
dip angle adopted for numerical study are shown in Figure 2.