what is subsidence
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What is Subsidence? Subsidence is the downward motion of ground surface in relation to an entity like the sea level. In other words it can be described as the downward shift of the ground surface. Subsidence is an occurrence that affects residents, geologists, business owners, surveyors, and geotechnical engineers. Subsidence is brought about by both natural occurrences and man made conditions. Human related processes that would bring about subsidence include mining, removal of natural gas, and overusing of ground water.
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Groundwater-related subsidence Mexico City subsidence. Not all groundwater-related subsidence is benign. In Mexico City, the buildings interact with the settlement, and cause cracking, tilting, and other major damage. In many places, large sinkholes open up, as well as surface cavities.
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subside vb (intr) 1. to become less loud, excited, violent, etc; abate. 2. to sink or fall to a lower level. 3. (Physical Geography) (of the surface of the earth, etc) to cave in; collapse. 4. (of sediment, etc) to sink or descend to the bottom; settle.
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- Making the world better, one answer at a time. Subsidence occurs when one plate is denser than the plate it is moving into. It then slips under the less dense plate and melts into the mantle. 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 c … ave system collapses, commonly called sinkholes.    . 6 people found this useful.
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What is broken heart syndrome? Losing a long term partner is one example of severe emotional stress that could cause broken heart syndrome. A broken heart can feel very real for those experiencing the loss of a loved one or significant other. But for some, the emotional stress does quite literally break their heart – at least temporarily – causing symptoms that can mimic a heart attack.
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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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Definition of Settlement and Subsidence Settlement: When a load is applied on the ground, it increases the Subsidence When downward movement of the ground occurs over a large area
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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. It is one of the major components in the water cycle.
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Sinkhole Science: A Primer One is called a cover-subsidence sinkhole. You find these in places like the Shenandoah Valley, or in sandier soils where you've got a void underground. As the soil above transports itself into that cave in the rock, the ground slowly subsides. So it's not catastrophic.
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- Definition. 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. It is one of the major components in the water cycle.
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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.
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Evolution of the Concept of Geosynclines This stage is characterised by the creation, sedimentation and subsidence of geosynclines. Geosynclines are formed due to contraction caused by the cooling process of the earth. The forelands or kratogens which border geosynclines succumbed to the forces of denudation.
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subversion subversion. n. 1. (Government, Politics & Diplomacy) the act or an instance of subverting or overthrowing a legally constituted government, institution, etc. 2. (Government, Politics & Diplomacy) the state of being subverted; destruction or ruin. 3. (Government, Politics & Diplomacy) something that brings about an overthrow.
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Land Subsidence Land subsidence occurs when large amounts of groundwater have been withdrawn from certain types of rocks, such as fine-grained sediments. The rock compacts because the water is partly responsible for holding the ground up. When the water is withdrawn, the rocks falls in on itself.
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Sinkholes and Land Subsidence Dissolution, Cover Subsidence, Cover collapse Dissolution: acidic groundwater seeps through soil, dissolves underlying limestone along fractures, which widen to lumpy or jagged karst surfaces
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- A: Subduction is a geological process that takes place at the boundaries between tectonic plates in which one plate is forced underneath another. Subduction occurs when the massive pressures of entire continental or oceanic tectonic plates collide, over the course of millennia, and one slowly is subsumed underneath the other.
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What is subsidence? Admiral explains Subsidence can occur when the ground below the house shrinks or swells due to the weather - during wet weather the ground expands due to the moisture but then contracts during the dry summer months. So, as much as we may crave a long hot summer, it's certainly not ideal for homes built on clay. What causes subsidence?
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Where does uplift occur? Where does subsidence occur? Subsidence is the motion of a surface (usually, the Earth's surface) as it shifts downward relative to a datum such as sea-level. The opposite of subsidence is uplift, which results in an increase in elevation. Ground subsidence is of concern to geologists, geotechnical engineers and surveyors.
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- The dominant cause of land subsidence in the Delta is decomposition of organic carbon in the peat soils. Under natural waterlogged conditions, the soil was anaerobic (oxygen-poor), and organic carbon accumulated faster than it could decompose.
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- Start studying Sinkholes and Land Subsidence. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
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What is subsidence? Admiral explains What is subsidence? Simply put, a house that's subsiding is sinking into the ground. Homes built on clay are more likely to suffer from subsidence than those built on other types of soil.
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- Predicting and Mitigating Subsidence Hazards. The exact place and time of a disaster related to subsidence cannot usually be predicted with any degree of certainty. This is true of both slow subsidence related to fluid withdrawal and sudden subsidence related to sinkhole formation or mine collapse. Mitigation is the best approach to these hazards.
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- Weathering is the physical breakdown (disintegration) and chemical alteration (decomposition) of rocks to form soil or loose particles at or near Earth's surface. Weathering causes deterioration of building materials. It also weakens rocks, a great concern when weathered rocks are used for foundation.
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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. Based on WordNet 3.0, Farlex clipart collection.
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- Liquefaction is the name given to the process that converts a solid soil mass into a liquid. Liquefaction occurs in cohesionless soils (typically those with a higher content of larger grains such as sand sized clasts) which have water in the pore spaces, and are poorly drained.
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- Removal of these structural bonds causes overall consolidation and is manifested by settlement under loads and subsidence at the ground surface (Inter-Agency Committee on Land Subsidence in the San Joaquin Valley, 1958; Lofgren, 1960; Sajgalik, 1990).