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A rotational slump occurs when a slump block, composed of sediment or rock, slides along a concave-upward slip surface with rotation about an axis parallel to the slope. [3] Rotational movement causes the original surface of the block to become less steep, and the top of the slump is rotated backward.
Tilted block faulting, also called rotational block faulting, is a mode of structural evolution in extensional tectonic events, a result of tectonic plates stretching apart. [ 1 ] [ 2 ] When the upper lithospheric crust experiences extensional pressures, the brittle crust fractures, creating detachment faults . [ 3 ]
Slumping, cracking, or plume erosion facilitates the intrusion of underlying asthenosphere. [1] Potential energy that drives the delamination is released as the low density, hot asthenosphere rises and replaces the higher density, cold lithosphere. [ 2 ]
Mass wasting is a general term for any process of erosion that is driven by gravity and in which the transported soil and rock is not entrained in a moving medium, such as water, wind, or ice. [2] The presence of water usually aids mass wasting, but the water is not abundant enough to be regarded as a transporting medium.
Animation of a landslide in San Mateo County, California Landslips Noire River (Rivière Noire), Saint-Alban landslide 1894, Quebec, Canada [1] [2] Landslides , also known as landslips , skyfalls or rockslides , [ 3 ] [ 4 ] [ 5 ] are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls , mudflows ...
Observations made on long geologic times scales (≥10 6 annum) typically reveal much about slower, larger-magnitude geologic processes such as tectonism [5] from a regional to even global scale. Evaluation on geologically short time scales (10 3 -10 5 a ) can reveal much about the relatively shorter climatic cycles, [ 5 ] local to regional ...
A river bank can be divided into three zones: Toe zone, bank zone, and overbank area. The toe zone is the area which is most susceptible to erosion. [2] Because it is located in between the ordinary water level and the low water level, it is strongly affected by currents and erosional events. [2]
Extensional tectonics is associated with the stretching and thinning of the crust or the lithosphere.This type of tectonics is found at divergent plate boundaries, in continental rifts, during and after a period of continental collision caused by the lateral spreading of the thickened crust formed, at releasing bends in strike-slip faults, in back-arc basins, and on the continental end of ...