Dipslip

A dip-slip fault is a fault in which the relative movement of the blocks is parallel to the fault plane’s dip. This means the motion occurs mainly in the vertical direction, or along the slope of the fault surface, rather than horizontally along the fault trace. Dip-slip faults are distinguished from strike-slip faults, where movement is parallel to the fault’s strike, and from oblique-slip faults, which combine dip-slip and strike-slip motion.

There are two main types of dip-slip faults. Normal faults form in extensional tectonic regimes; the hanging wall moves downward relative to the footwall. They are common in continental rift zones and regions of crustal thinning, such as the Basin and Range Province in North America. Reverse faults, including low-angle thrust faults, form in compressional settings; the hanging wall moves up relative to the footwall. Thrust faults are a subset of reverse faults with relatively shallow dip angles and are characteristic of mountain belts formed by continental collision.

Dip-slip geometry can be described by the dip angle of the fault, the direction of dip (up or down the slope), and the sense of slip. Recognition in the field includes stratigraphic markers that become displaced across the fault, fault scarps, and slickensides on the fault plane. Dip-slip faults may also host secondary features such as fault-block basins or ranges.

In geology, dip-slip faults record crustal extension or compression and contribute to the interpretation of tectonic history, seismic hazard assessment, and the distribution of natural resources influenced by faulting. Oblique-slip faults incorporate a dip-slip component, adding complexity to faulting patterns in many regions.