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Vertical deformation in Tianjin area during 1992-2008 was calculated from leveling data.The effect of large surface subsidence caused by extensive groundwater pumping was removed by fitting the data along each survey line with a polynomial function.The results are fitted with crustal blocks individually in this area.Vertical deformation rates are mapped,vertical rates of the main fault zones were calculated,and the activities of the blocks and fault zones were investigated.The observed vertical deformation shows that some of the blocks tilted and some blocks rose or subsided as a whole.The vertical rates at fault zones in the area vary within the range of 0.13-0.48 mm/a,with an average value of 0.29 mm/a.
Vertical deformation in Tianjin area during 1992-2008 was calculated from leveling data. The effect of large surface subsidence caused by extensive groundwater pumping was removed by fitting the data along each survey line with a polynomial function. The results are fitted with crustal blocks individually in this area. Vertical rates of the main fault zones were calculated, and the activities of the blocks and fault zones were investigated. The observed vertical deformation shows that some of the blocks tilted and some blocks rose or subsided as a whole.The vertical rates at fault zones in the area vary within the range of 0.13-0.48 mm / a, with an average value of 0.29 mm / a.