Geoscience Ontology, Faults

A regional-scale, large displacement, low-angle normal fault.

In plan view, the side opposite the observer is displaced to the right.

Fault with right-lateral strike-parallel displacement component of slip vector more than 10 times the dip-parallel component of the slip vector at at least one location along the fault, and right-lateral displacement over more than half the mapped trace of the fault.

A fault along which there is some separation parallel to the dip of the fault.

The net slip of the fault lies in the dip direction of the fault.

a broadly planar zone of shear displacement within which deformation has occurred without loss of material continuity

Displacement across a fault is substantially in the direction perpendicular to the fault. The fault-parallel displacement is effectively zero.

A fault whose two sides have approached each other substantially in the direction perpendicular to the fault.

A discrete surface, or zone of discrete surfaces, with some thickness, separating two rock masses across which one mass has slid past the other and characterized by brittle deformation.

magnitude of slip or separation

Quality that specifies the relative sense of displacement (right, left, up, down) between rocks on opposites of a fault.

Slip vector linking piercing point on opposite sides of fault, or separation vector linking offset surface along fault trace.

a vector (magnitude and orientation) specifying the distance between the intersection of a surface on opposite sides of a displacment surface. In 3-D is the projection of a vector normal to the displaced surface into the displacment surface, but might also be specified as offset of the intersection of displacement surface and marker surface in some other profile view (e.g. horizontal/map view, or a cross section)

a vector (magnitude and orientation) that links a peircing point on opposite sides of a displacement surface.

A material spatial feature that contains one or more fault surfaces as well as deformed rocks related to the faults located between and adjacent to the fault traces

A large-displacement (kilometers or tens of kilometers) shallowly dipping to subhorizontal fault or shear zone.

Fault that dips at least 45 degrees over more than half of its recognized extent, for which slip or separation is not explicitly specified.

Fault that dips at least 45 degrees over more than half of the recognized extent of the fault with the hanging wall displaced from a structurally higher position relative to footwall rocks.

Reverse fault that dips at least 45 degrees over more than half of its recognized extent, for which slip or separation is not explicitly specified.

Fault that dips less than 10 degrees over more than half the recognized extent of the fault.

High angle fault with slip vector that has ratio of strike-parallel to dip-parallel displacement between 10 to 1 and 1 to 10 at at least one location along the mapped trace, with left-lateral strike-parallel component and normal dip-parallel component over at least half the mapped trace of the fault.

High angle fault with slip vector that has ratio of strike-parallel to dip-parallel displacement between 10 to 1 and 1 to 10 at at least one location along the mapped trace, with left-lateral strike-parallel component and reverse dip-parallel component over at least half the mapped trace of the fault.

Fault that dips less than 45 degrees over more than half of the recognized extent of the fault.

Fault that dips less than 45 degrees over more than half of the recognized extent of the fault with the hanging wall displaced from a structurally higher position relative to footwall rocks.

An extraction fault with some displacement within the fault plane.

The fault-parallel displacement is effectively zero, as in an extraction fault.

The hanging wall has been displaced down relative to the footwall, dip of fault usually 45-90 degrees.

The movement sense includes both normal and dextral components.

Fault with dip-parallel displacement component of slip vector more than 10 times the strike-parallel component of the slip vector over more than half recognized extent of the fault, and for which the fault dips consistently in the same direction, and for which the hanging wall has been displaced down relative to the footwall.

The movement sense includes both normal and sinistral components.

The net slip of the fault lies between the strike and dip directions of the fault, the slip vector rakes between 10 and 80 degrees in the plane of the fault.

Fault with slip vector that has ratio of strike-parallel to dip-parallel displacement between 10 to 1 and 1 to 10 at at least one location along the mapped trace of the fault.

An extraction fault with no discernible displacement within the fault plane.

The hanging wall has been displaced up relative to the footwall, dip of fault usually greater than 45 degrees.

The movement sense includes both reverse and dextral components.

Fault with dip-parallel displacement component of slip vector more than 10 times the strike-parallel component of the slip vector at at least one location along the mapped trace of the fault, and the fault dips consistently in the same direction with the hanging wall displaced up relative to the footwall over at least half the mapped trace of the fault.

The movement sense includes both reverse and sinistral components.

High angle fault with slip vector that has ratio of strike-parallel to dip-parallel displacement between 10 to 1 and 1 to 10 at at least one location along the mapped trace, with right-lateral strike-parallel component and normal dip-parallel component of slip over at least half the mapped trace of the fault

High angle fault with slip vector that has ratio of strike-parallel to dip-parallel displacement between 10 to 1 and 1 to 10 at at least one location along the mapped trace, with a right-lateral strike-parallel component and reverse dip-parallel component of slip over at least half the mapped trace of the fault.

A fault on which there is increasing offset or separation along the strike from an initial point of no offset, with the opposite sense of offset in the opposite direction.

A fault on which there is increasing offset or separation along the strike from an initial point of no offset, with reverse offset in the opposite direction.

In plan view the side opposite the observer is displaced to the left.

Fault with left-lateral strike-parallel displacement component of slip vector more than 10 times the dip-parallel component of the slip vector at at least one location along the fault, and left-lateral displacement over more than half the mapped trace of the fault.

planar features indicate some displacement parallel to the strike of the fault.

The net slip of the fault (slip vector) is parallel to the strike of the fault.

Fault with strike-parallel displacement component of slip vector more than 10 times the dip-parallel component of the slip vector at at least one location along the mapped trace of the fault.

A regional-scale low-angle thrust fault.

Fault that dips less than 45 degrees over more than half of the recognized extent of the fault, with a hanging wall displaced from a structurally deeper position relative to footwall rocks.

A large scale strike-slip fault in which the fault surface is steeply inclined.

A variety of strike-slip fault along which the displacement suddenly stops or changes form, typically associated with mid-ocean ridges.

A strike slip fault in which the fault plane dips at least 45 degrees over more than half of the recognized extent of the fault.