What is a Microfault?
Micro-faults were classified into two groups related to stress state before and after earthquake using misfit angle. Misfit angle is the angle between calculated slip direction and observed slip direction for each estimated stress state. Microfaults were sampled from TCDP core.
What is a Decollement in geology?
1. n. [Geology] A fault surface parallel to a mechanically weak horizon or layer, or parallel to bedding, that detaches or separates deformed rocks above from undeformed or differently deformed rocks below.
What is duplex in geology?
Duplex structures are a system of imbricate thrust faults that branch off from a floor thrust below and curve upward to join a roof thrust at a branch line. The fault bound bodies of rock in the duplex are called horses.
What is hanging wall and footwall?
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 basal detachment?
Décollement (from French décoller ‘to detach from’) is a gliding plane between two rock masses, also known as a basal detachment fault. Décollements are a deformational structure, resulting in independent styles of deformation in the rocks above and below the fault.
What is Listric fault in geology?
1. n. [Geology] A normal fault that flattens with depth and typically found in extensional regimes. This flattening manifests itself as a curving, concave-up fault plane whose dip decreases with depth.
What is a crack in the earth called?
Faults are cracks in the earth’s crust along which there is movement. These can be massive (the boundaries between the tectonic plates themselves) or very small. If tension builds up along a fault and then is suddenly released, the result is an earthquake.
What are the 4 different types of faults?
There are four types of faulting — normal, reverse, strike-slip, and oblique. 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.
What is imbricate fault?
An imbricate structure consists of a series of overlapping rock slices separated by steeply inclined subparallel reverse faults and bounded above and below by major low-angle thrust surfaces. The arrangement is somewhat similar to a set of books leaning against one another on an incompletely filled shelf.
What is schuppen structure in geology?
a structure built to support the lateral pressure of an arch or span, e.g., at the ends of a bridge.