Before getting into the different types of faults, you must understand the difference between a HANGING WALL and a FOOTWALL. The hanging wall is the block of rock above the fault line. You can hang something from the hanging wall as if it were a ceiling. The footwall is the block of rock below the fault line.
What is the foot wall of a fault?
When rocks slip past each other in faulting, the upper or overlying block along the fault plane is called the hanging wall, or headwall; the block below is called the footwall. The fault strike is the direction of the line of intersection between the fault plane and Earth’s surface.
What is a footwall in mining?
footwall. / (ˈfʊtˌwɔːl) / noun. the rocks on the lower side of an inclined fault plane or mineral veinCompare hanging wall.
How do you find hanging wall and footwall?
To determine which is which, visualize yourself creating a mine in along the fault plane. The block below your feet is the footwall, and the one upon which you would hang your miner’s lamp is the hanging wall. It is that simple.
What is an hanging wall?
Definition of hanging wall
: the upper or overhanging wall of an inclined vein, fault, or other geologic structure —opposed to footwall.
What are the 3 fault types?
There are three main types of fault which can cause earthquakes: normal, reverse (thrust) and strike-slip. Figure 1 shows the types of faults that can cause earthquakes. Figures 2 and 3 show the location of large earthquakes over the past few decades.
What are the two types of faults?
A normal fault is one in which the rocks above the fault plane, or hanging wall, move down relative to the rocks below the fault plane, or footwall. A reverse fault is one in which the hanging wall moves up relative to the footwall.
How fault is formed?
A fault is formed in the Earth’s crust as a brittle response to stress. Generally, the movement of the tectonic plates provides the stress, and rocks at the surface break in response to this. Faults have no particular length scale.
Who coined the term hanging wall and footwall?
d) Miners. Explanation: Actually the terms “hanging wall” and “foot wall” have been coined by the miners: while traversing along a track excavated in fault plane, the wall under their feet would be foot wall whereas the other block would hang above their heads.
What is the difference between a hanging wall and a footwall quizlet?
Terms in this set (10)
What is the difference between a hanging wall and a footwall? A hanging wall is the overhanging rock until on the slant the separates the two slabs, while the footwall below the slant.
What happens to the hanging wall and footwall In a normal fault?
In normal faults, the hanging wall drops down relative to the footwall. Normal faults are caused by tension that pulls the crust apart. This causes the hanging wall to slide down.
Does the footwall move?
If the foot wall moves down relative to the hanging wall, then it is a reverse fault. 2. When the motion on a fault is more horizontal, then it is called a strike-slip or lateral fault. Two types of strike slip faults can be distinguished by relative lateral motion of the fault.
Which type of fault is described by a hanging wall slipping down the footwall?
Normal dip-slip faults are produced by vertical compression as Earth’s crust lengthens. The hanging wall slides down relative to the footwall. Normal faults are common; they bound many of the mountain ranges of the world and many of the rift valleys found along spreading margins…
When the hanging wall slips downward below the footwall what kind of fault is it?
Normal faults, or extensional faults, are a type of dip-slip fault. They occur when the hanging wall drops down and the footwall drops down.
What is dip slip?
Dip-slip faults are inclined fractures where the blocks have mostly shifted vertically. If the rock mass above an inclined fault moves down, the fault is termed normal, whereas if the rock above the fault moves up, the fault is termed reverse. A thrust fault is a reverse fault with a dip of 45 degrees or less.
What do you mean by anticline?
An anticline is a fold that is convex upward, and a syncline is a fold that is concave upward. An anticlinorium is a large anticline on which minor folds are superimposed, and a synclinorium is a large syncline on which minor folds are superimposed.
What is a fault plane?
The fault plane is the planar (flat) surface along which there is slip during an earthquake.
