An
extensional fault is a fault that vertically thins and horizontally extends portions of the
Earth's crust and/or
lithosphere. In most cases such a fault is also a
normal fault, but may be rotated to have a shallower geometry normally associated with a
thrust fault. Extensional faults are generally planar and, so long as the
stress field is oriented with the maximum stress direction orthogonal to the Earth's surface initiate with a dip of 60° typically continuing down to the base of the
seismogenic layer.