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.