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Diagram of horsts and grabens In geology , horst and graben (or range and valley ) refers to topography consisting of alternating raised and lowered fault blocks known as horsts and grabens . The features are created by normal faulting and rifting caused by crustal extension . [ 1 ]
Dendritic drainage: the Yarlung Tsangpo River, Tibet, seen from space: snow cover has melted in the valley system. In geomorphology, drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of land, whether a particular region is ...
In geology, a basin is a region where subsidence generates accommodation space for the deposition of sediments. A pull-apart basin is a structural basin where two overlapping (en echelon) strike-slip faults or a fault bend create an area of crustal extension undergoing tension, which causes the basin to sink down.
Strike and dip are generally written as 'strike/dip' or 'dip direction,dip', with the degree symbol typically omitted. The general alphabetical dip direction (N, SE, etc) can be added to reduce ambiguity. For a feature with a dip of 45° and a dip direction of 75°, the strike and dip can be written as 345/45 NE, 165/45 NE, or 075,45.
Bar Initiation: The braid bar will form following a series of dune amalgamations. As sediments are deposited to form the braid bar, flow in the channel begins to diverge, with the braid bar acting as a wedge. This stage is associated with high flow in the braided river. Bar Growth: Dune amalgamation continues as an accretionary dune front is ...
Diagram illustrating the structural relationship between grabens and horsts Infrared-enhanced satellite image of a graben in the Afar Depression. In geology, a graben (/ ˈ ɡ r ɑː b ən /) is a depressed block of the crust of a planet or moon, bordered by parallel normal faults.
A military police officer has been arrested in Brazil after a video emerged of him throwing a civilian over a bridge in Sao Paulo on Monday, sparking protests in the city.
Lake-filled half-graben showing sedimentation dominantly from the 'hinge' margin. Four zones of sedimentation can be defined in a half-graben. The first is "escarpment margin" sedimentation, found along the major border faults bounding the half graben, where the deepest part of the basin meets the highest rift-shoulder mountains. [6]