fault plane

Thus, in Figure 185, the rigid earth block under lateral thrust has found it easier to break along the fault plane than to fold.

In 1891 there occurred along an old fault plane in Japan a slip which produced an earth rent traced for fifty miles (Fig. 192).

Normal faults occur in response to pulling or tension; the overlying block moves down the dip of the fault plane.

Thrust (reverse) faults occur in response to squeezing or compression; the overlying block moves up the dip of the fault plane.

The angle (ff´v) which the fault plane makes with the vertical is the hade.