What geological feature is a fracture in earth's crust?
A fracture is any separation in a geologic formation, such as a joint or a fault that divides the rock into two or more pieces. A fracture will sometimes form a deep fissure or crevice in the rock. Fractures are commonly caused by stress exceeding the rock strength, causing the rock to lose cohesion along its weakest plane. Fractures can provide permeability for fluid movement, such as water or hydrocarbons. Highly fractured rocks can make good aquifers or hydrocarbon reservoirs, since they may possess both significant permeability and fracture porosity.
What geological feature is a crack in the earth's crust, with no movement?
Fracture
Fracture (geology)
where formula_3 is the stress intensity factor for Mode I, II, or III cracking and formula_4is a dimensionless quantity that varies with applied load and sample geometry. As the stress field gets close to the crack tip, i.e. formula_5, formula_4becomes a fixed function of formula_7. With knowledge of the geometry of the crack and applied far field stresses, it is possible to predict the crack tip stresses, displacement, and growth. Energy release rate is defined to relate K to the Griffith energy balance as previously defined. In both LEFM and energy balance approaches, the crack is assumed to be cohesionless behind the crack tip. This provides a problem for geological applications such a fault, where friction exists all over a fault. Overcoming friction absorbs some of the energy that would otherwise go to crack growth. This means that for Modes II and III crack growth, LEFM and energy balances represent local stress fractures rather than global criteria.
What geological feature is a fracture in the earth's crust, with movement?
Fault
Fracture (geology)
Fracture (geology)
https://en.wikipedia.org/wiki/Fracture%20%28geology%29
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements.
Fault (geology)
A crack in the Earth's crust with no movement is the geological feature called a fracture, whereas one with movement is the geological feature called a fault. A fracture is any separation in a geologic formation, such as a joint or a fault that divides the rock into two or more pieces. A fault is a planar fracture or discontinuity in rock across which there has been significant displacement.