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- Strictly speaking, a fault is a single fracture surface. However, many mapped faults turn out to have multiple fault strands, all roughly parallel, but branching and joining (“anastomosing”) along their strike. This type of fault array is called a fault zone. The total offset of the fault zone is distributed across the zone.
An extensive terminology has developed around faults, their geometry, and movement (kinematics). It is important to distinguish between descriptive (geometric) terms, which tell us about the orientation of a fault and the offset of layers on either side, and kinematic terms, which describe the distance and direction of fault movement.
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How do you describe a fault based on geometry?
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Describing the fault geometry. How do you usually describe a plane (with lines)? In geology, we choose these two lines to be: strike. dip. strike is the orientation of the line where the fault plane intersects the horizontal plane.
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Faulting Geometry. Faulting is a complex process and the variety of faults that exists is large. We will consider a simplified but general fault classification based on the geometry of faulting, which we describe by specifying three angular measurements: dip, strike, and slip.
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Nov 28, 2023 · Faults can also be described based on their geometry as dip-slip (vertical motion), strike-slip (horizontal motion), oblique-slip (combination of vertical and horizontal motion), or listric (curved fault planes).
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 geometry is usually described as a planner surface across which the relative motion of rock mass occurred during an earthquake. This assumption is considered to simplify the computational methods, however, a real fault may have complicated geometry. The fault geometry indicates the fault plane and the direction of the slip along the plane.
An extensive terminology has developed around faults, their geometry, and movement (kinematics). It is important to distinguish between descriptive (geometric) terms, which tell us about the orientation of a fault and the offset of layers on either side, and kinematic terms, which describe the distance and direction of fault movement.
