Subsidence 05
Subsidence 05 :
"Depressions, cracks, and sinkholes in the earth's surface which can threaten people and property. Subsidence depressions, which normally occur over many days to a few years, may damage structures with low strain tolerances such as dams, factories, nuclear reactors, and utility lines. The sudden collapse of the ground surface to form sinkholes many tens of yards wide and deep within the span of a few minutes to a few hours, poses an immediate threat to life and property. Such mass-gravity movements commonly continue for days, weeks, months, or even years until the walls stabilize". (FEMA, Hazard Identification.., 1985, p. A-3)
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