Abstract

There are numerous artificial and natural causes for ground subsidence, from dissolution and removal of evaporite deposits in the East, to collapse of underground coal seams and mines in the Midwest, to growth faults in the South, to subsidence due to groundwater withdrawal in the West. Ground subsidence is not a serious hazard unless homes or subsurface infrastructure (pipelines, tunnels, etc.) are impacted. This chapter devotes most of its attention to subsidence due to groundwater withdrawal and identifying subsidence fissures using aerial photographs. Ground subsidence due to collapsing soils and growth faults in the Mississippi Delta area are also covered.

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