Subsidence or Land Subsidence : The loss of surface elevation due to removal of subsurface support. This may be due to natural or man-made causes that lead to erosion of subsurface materials
Tom May, CEM, Steve Davis, Larrie Wright, All Hands Community, Glossary of Terms and Definitions (in the fields of Emergency Management, Business Continuity and related service areas), 3rd Ed, USA 2005. http://www.macogonline.org/archive/homeland/emerge ncy_glossary.pdf, (Emr Mgt, Biz Cont and related srvc areas - Brit) {482}