我国因开采、利用地下水资源而产生地面沉降的城市或地区近 10 0个 ,已在不同程度上威胁到城市或地区的可持续发展。有关部门曾先后于 196 4、 1980、 1988、 1990及 1998年在上海和天津召开过 5次全国性地面沉降学术研讨会。这些会议对我国各地区地面沉降调查、监测、研究和防 Nearly 100 cities or areas in China that have suffered ground subsidence due to exploitation and utilization of groundwater resources have threatened the sustainable development of cities or areas to varying degrees. The relevant departments successively held 5 national land subsidence academic seminars in Shanghai and Tianjin in 196 4, 1980, 1988, 1990 and 1998 respectively. These meetings investigate, monitor, study and prevent land subsidence in various regions of our country