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.
Read more about Subsidence: Dissolution of Limestone, Mining, Extraction of Natural Gas, Earthquake, Groundwater-related Subsidence, Faulting Induced, Isostatic Subsidence, Seasonal Effects