what is an subsidence
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subsidence subsidence - the sudden collapse of something into a hollow beneath it. cave in. collapse - a natural event caused by something suddenly falling down or caving in; the roof is in danger of collapse; the collapse of the old star under its own gravity subsidence. noun sinking, settling, collapse, settlement The problems were caused by subsidence. subsidence
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- Subsidence holes and troughs are the main forms of surface instability. The former is defined by the creation of sharply delineated surface sinkholes (cave-ins) formed as a result of upward progressing chimney-shaped failures from mine junctions. These junctions represent the largest mine roof spans).
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- subside(Verb) To sink or fall to the bottom; to settle, as lees. subside(Verb) To tend downward; to become lower; to descend; to sink. subside(Verb) To fall into a state of quiet; to cease to rage; to be calmed; to settle down; to become tranquil; to abate.
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- Mine Subsidence Engineering Consultants 36 August 2007 1.7.6. The Lateral Distribution of Upsidence Upsidence is the result of two separate mechanisms, namely, valley bulging and buckling of the strata in the base of the valley.
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Subsequence In mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements. For example, the sequence is a subsequence of.
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- The subsidence factor is dependent on the lithologies and the treatment of caving (total or over some form of stowing), Table 1, Figure 14. It decreases with depth of mining. The severity of surface deformation and resultant discontinuities 'a' is inversely proportional to mining depth.
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Definitions &Translations In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones.Rates of subduction are typically centimetres per year, with the average rate of convergence being approximately two to eight centimetres per year.hat is, the subducted lithosphere is always oceanic while the over-riding lithosphere may or may not be oceanic. Subduction zones are sites of high rates of volcanism, earthquakes, and mountain building.
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Slump (geology)update Slump (geology) For other uses, see Slump (disambiguation). A slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or rock layers moves a short distance down a slope. Movement is characterized by sliding along a concave-upward or planar surface.
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resolution 1. subsidence of a pathological state, as the subsidence of an inflammation, or the softening and disappearance of a swelling. 2. perception as separate of two adjacent points; in microscopy, the smallest distance at which two adjacent objects can be distinguished as separate.
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- 1 For subsidence caused by sudden collapse of the ground to form sinkholes, several measures can be taken. 2  First, geologists can make maps of areas known to be underlain by rocks like limestone, gypsum, or salt, that are susceptible to dissolution by fluids.
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- Split and merge into it. Answer by Paul Jones. Confidence votes 68.5K. Rockhound. A drop in the elevation of the surface of the land is called land subsidence, and can be caused by a collapse of underground mining shafts or naturally occurring underground cave system collapses, commonly called sinkholes.plit and merge into it. Answer by Paul Jones. Confidence votes 68.5K. Rockhound. A drop in the elevation of the surface of the land is called land subsidence, and can be caused by a collapse of underground mining shafts or naturally occurring underground cave system collapses, commonly called sinkholes.
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Definitions &Translations In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones. Rates of subduction are typically centimetres per year, with the average rate of convergence being approximately two to eight centimetres per year.
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What is Subsurface Utility Engineering (SUE)? What is Subsurface Utility Engineering (SUE)? February 23, 2012 / in Utility Locating / by Rob Harris SUE (subsurface utility engineering) is an engineering technique which identifies the quality of underground utility information. Using this technique will result in better designs and enhance damage prevention efforts.
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The most common causes of subsidence are as follows: Tree roots spread out in search of water. Clay soils are a ready source of water that a tree can remove by suction. When trees grow in shrinkable clay soils they locally dry out the soils and can often cause subsidence if they affect the soils beneath the footings.
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CONVECTION In the atmosphere, subsidence results from a disturbance in the normal upward flow of convection currents. These currents may act to set up a convective cell, as we have seen, resulting in the flow of breeze. The water vapor in the air may condense as it cools, changing state to a liquid and forming clouds. Convection can create an area of low pressure, accompanied by converging winds, near Earth's surface, a phenomenon known as a cyclone.
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Subversion Subversion is a version control system that keeps track of changes made to files and folders (directories), facilitating data recovery and providing a history of the changes that have been made over time.
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- sub-. prefix. 1. situated under or beneath: subterranean. 2. secondary in rank; subordinate: subeditor. 3. falling short of; less than or imperfectly: subarctic; subhuman. 4. forming a subdivision or subordinate part of a whole: subcommittee.
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John Bellman & Associates Ltd. Subsidence can be induced by the chalk on which such areas are built, dissolving. Such “solution features” are either caused by excess water building up in one area or by the flow of underground water through zones of chalk which are weaker than others.
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What is subsidence? Admiral explains If you're concerned about subsidence, find out about signs, causes and whether your insurance covers you from home insurer, Admiral. If Homes Under the Hammer has taught us anything - aside from the fact avocado bathroom suites will never make a comeback - it's that subsidence can spell bad news for homeowners.
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Glossary of Water Terminology 1 soil-sediment on or near the Earth's surface that is formed by the chemical and physical weathering of rocks as well as the decay of living matter. 2  soil subsidence-the lowering of the normal level of the ground, usually due to over pumping of water or oil from wells.
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Subsidence If the pressure drops, the soil pressure increases and this leads to subsidence at the ground level. Since exploitation of the Slochteren (Netherlands) gas field started in the late 1960s the ground level over a 250 km² area has dropped by a current maximum of 30 cm.
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- Subsurface runoff is the water that infiltrates in the vadose zone (unsaturated zone), from rain, snowmelt, or other sources, and moves laterally towards the streams. Vadose zone extends from the top of the ground surface to the water table.
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Technical Guide to Mine Subsidence Mine subsidence can be defined as movement of the ground surface as a result of readjustments of the overburden due to collapse or failure of underground mine workings. Surface subsidence features usually take the form of either sinkholes or troughs.
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- Freebase(0.00 / 0 votes)Rate this definition: In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones.
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What animal eats a arctic willow? An arctic willow is an autotroph and makes it's own food from carbon dioxide in the air, water from the ground and sunlight. Plus a few trace minerals and ions from the soil.
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- Subsidence can also occur as a result of un-derground mining, excessive pumping of groundwater, or subsurface ero-sion due to the failure of existing utility lines. All of these examples of sub-sidence can produce surface features that appear similar, but not all arenaturally occurring.