Normal Fault


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Related to Normal Fault: thrust fault

normal fault

[′nȯr·məl ′fȯlt]
(geology)
A fault, usually of 45-90°, in which the hanging wall appears to have shifted downward in relation to the footwall. Also known as gravity fault; normal slip fault; slump fault.

Normal Fault

 

a fracture-type tectonic displacement of rocks. In a normal fault, the relative displacement of rocks occurs either vertically or along a steeply inclined fracture in such a way that the rocks of the hanging wall are shifted downward and the rocks of the footwall move upward. Normal faults often occur in pairs, forming depressions called grabens or elevations called horsts. Step faults are also common. Normal faults form primarily under conditions of tension. Some normal faults have amplitudes of 4 and 5 km.

References in periodicals archive ?
3D], studied the evolution law of mining stress, elastic energy distribution characteristics and fault activation pattern when the working face headed towards the normal fault.
Further west of Kalabagh Hills Fault, a steeply west dipping normal fault named as Kuch Tender Fault appears on the cross-section that is attributed to gravitational collapse of the hanging wall of the Kalabagh Hills Fault.
In this area, we can distinguish two main fault sets displacing young deposits and landforms: N-S normal faults, and WNW-ESE oblique faults (normal faults with minor strike-slip component).
The southern part of the network is located along the southern limb of Sierra Tejeda, deformed by NW-SE oriented normal faults, and reaches the coast line with sites 890 and 880, build up respectively on Alpujarride metapelites and marbles.
Normal faults are often associated with divergent (tensional) boundaries.
The original dip of the faults is uncertain, but they probably dipped at up to about 45% much like most seismically active normal faults presently observed at the axes of mid-ocean ridges.
According to standard seismological theory, it should make little difference whether a house sits next to a thrust fault or a normal fault.
The veins themselves occupy normal faults, with their strike, dip and width varying according to the host rock type.
A major north-south trending normal fault, the Cerro Bola fault, was formed in the study area.
2008a, Behavior of deep immersed tunnel under combined normal fault rupture deformation and subsequent seismic shaking.
The CVF was originally an E-dip normal fault that controlled the deposition of Permian-Triassic and Jurassic rocks, so the thickness of these rocks increases toward the east of the CVF.
1998) assumed that this event occurred on an east-west, normal fault located near epicenter with a dip of 45[degrees] which is compatible with the known tectonics of the area and mean displacement of 0.