2.Current status and main features At present, more than 11 cities have had the accumulative subsidence greater than 1 m at their subsidence centers.These cities include Shanghai, Tianjin,Suzhou,Wuxi,Changzhou,Cangzhou,Xian, Fuyang,Taiyuan,An'yang and Taibei.Investigation has shown that the land subsidence in China have been caused primarily by increasing withdrawal of groundwater from ground at various depths. 2. Current status and main features At present, more than 11 cities have had the accumulative subsidence greater than 1 m at their subsidence centers. These cities include Shanghai, Tianjin, Suzhou, Wuxi, Changzhou, Cangzhou, Xian, Fuyang, Taiyuan, An’yang and Taibei. Investigation has shown that the land subsidence in China have been caused primarily by increasing withdrawal of groundwater from ground at various depths