000			01464pab a2200217 454500
008			180718b1997 xxu||||| |||| 00| 0 eng d
100			_aAmin, Ammar
245			_aCauses of land subsidence in the Kingdom of Saudi Arabia
260			_c1997
300			_ap.57-63
362			_aJuly
520			_aThe occurrence of land subsidence in the Kingdom Saudi Arabia is either natural or man-made. Natural land subsidence occurs due to the development of subterranean voids by a solution of host rocks in carbonate and evaporite terrains, over many areas of Saudi Arabia. Man-induced land subsidence is either due to the removal of groundwater in the agricultural areas or to wetting of unstable soils. Therefore, earth fissures and a lowering of the ground surface in unconsolidated sediments took place in alluvial plains and volcanic vent terrains. Unstable soils include Sabkha soils and loess sediments. These types of soils occur in coastal plains, desert areas and volcanic terrains. When this soil is wetted either during agricultural activities, waste disposal or even during a rain storm, subsidence takes place due to either the removal of salts from the Sabkha soil or the rearrangement of soil particles in loess sediments. - Reproduced
650			_aSabkha soil
650			_aLoess sediments
650			_aSalt diapers
650			_aKarst
650			_aLand subsidence
700			_aBankher, Khalid
773			_aNatural Hazards
909			_a40458
999			_c40458 _d40458