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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.
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.
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.
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.
Fault-Horst-Graben-ar.svg This is a retouched picture , which means that it has been digitally altered from its original version. Modifications: Redraw of pixel (jpg) image as vector (svg) .
Use the service request map to see where other reports have been made in the last 30 days. To report an issue with a state road, call 859-246-2059 or 859-246-2355.
This is a list of properties and historic districts in Kentucky that are listed on the National Register of Historic Places. There are listings in all of Kentucky's 120 counties . The locations of National Register properties and districts (at least for all showing latitude and longitude coordinates below), may be seen in an online map by ...
The deadly flash flooding throughout eastern Kentucky has led to extensive road closures and hazardous conditions. Drone photos and video from the region show widespread damage as rising waters ...