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strike-slip fault, in geology, a fracture in the rocks of Earth’s crust in which the rock masses slip past one another parallel to the strike, the intersection of a rock surface with the surface or another horizontal plane.
Transform faults within continental plates include some of the best-known examples of strike-slip structures, such as the San Andreas Fault, the Dead Sea Transform, the North Anatolian Fault and the Alpine Fault.
Faults which move along the direction of the dip plane are dip-slip faults and described as either normal or reverse (thrust), depending on their motion. Faults which move horizontally are known as strike-slip faults and are classified as either right-lateral or left-lateral.
Strike-slip faults accomplish lateral relative motion, which may be dextral (right lateral) or sinistral (left-lateral). Terminology for strike-slip faults has evolved based on the spatial scale and context of faulting.
A strike-slip fault is a geological fault where the movement of tectonic plates occurs predominantly horizontally, parallel to the fault plane, in opposite directions, typically due to horizontal shearing forces.
A focal mechanism, or "beachball", is a graphic symbol that indicates the type of slip that occurs during an earthquake: strike-slip, normal, thrust (reverse), or some combination. It also shows the orientation of the fault that slipped.
The San Andreas Fault—made infamous by the 1906 San Francisco earthquake—is a strike-slip fault. This means two fault blocks are moving past each other horizontally. Strike-slip faults tend to occur along the boundaries of plates that are sliding past each other.
Strikeslip faults are faults with very little vertical component of motion, i.e.: the slip vector is nearly parallel with the strike line. Strikeslip faults are typically steep or
Strike-slip faults are vertical (or nearly vertical) fractures where the blocks have mostly moved horizontally. The fault motion of a strike-slip fault is caused by shearing forces. If the block on the far side of the fault moves to the left, as shown in this animation, the fault is called left-lateral.
Strike-slip faults show horizontal movement in two opposite directions, i.e. right or left with respect to an observer. The former is called a dextral or right-lateral strike-slip fault, while the latter is called a sinistral or left-lateral strike-slip fault.