长期生活和工作在中国首都的人也许并没有意识到,北京的地面正在以每年十到二十毫米的速度下沉。其中北京东郊在过去的40年间,已累计下沉了700多毫米。西南郊的大兴县庞各庄、榆垡一带,近十多年沉降了330多毫米。 专门从事北京地面沉降监测与分析的北京测绘设计研究院,从1966年河北邢台地震后,开始重视地面下沉的研 People who live and work in the Chinese capital for so long may not be aware that the ground in Beijing is sinking at a rate of 10 to 20 millimeters a year. The eastern suburbs of Beijing have accumulated more than 700 mm in the past 40 years. Daxing County in the southwestern suburbs Panggezhuang, Elm area, the settlement of more than a decade more than 330 millimeters. Beijing Institute of Surveying, Mapping and Design, specializing in the monitoring and analysis of land subsidence in Beijing. Since the earthquake in Xingtai, Hebei Province in 1966,