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A graben is a section of crust that has lowered relative to the blocks on either side, which is a result of its bounding faults dipping towards each other. [2] The plural of graben can be either graben or grabens. Graben form low-lying features such as basins and rift valleys. [1] [2] They can be very long relative to their width.
Graben often occur side by side with horsts. Horst and graben structures indicate tensional forces and crustal stretching. Graben are produced from parallel normal faults, where the displacement of the hanging wall is downward, while that of the footwall is upward. The faults typically dip toward the center of the graben from both sides.
Later, an apparent reversal in the polarity of tectonic subduction at the Laurentia-Taconic boundary caused the entire horst-graben structure to invert - the formerly deep graben between the two Tanglewood horsts was raised, while the two horsts subsided, causing the area of deposition of the Tanglewood member to shift to the area previously ...
In physical geography and geology, a horst is a raised fault block bounded by normal faults. [1] Horsts are typically found together with grabens. While a horst is lifted or remains stationary, the grabens on either side subside. [2] This is often caused by extensional forces pulling apart the crust.
With crustal extension, a series of normal faults which occur in groups, form in close proximity and dipping in opposite directions. [4] As the crust extends it fractures in series of fault planes, some blocks sink down due to gravity, creating long linear valleys or basins also known as grabens, while the blocks remaining up or uplifted produce mountains or ranges, also known as horsts.
Location of Pulaski County in Kentucky. This is a list of the National Register of Historic Places listings in Pulaski County, Kentucky. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Pulaski County, Kentucky, United States. The locations of National Register properties and ...
This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Logan County, Kentucky, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.
Location of Wayne County in Kentucky. This is a list of the National Register of Historic Places listings in Wayne County, Kentucky. It is intended to be a complete list of the properties on the National Register of Historic Places in Wayne County, Kentucky, United States. The locations of National Register properties for which the latitude and ...