The leaning is due to ground subsidence caused by over-pumping of groundwater. In 1996, the amount of inclination surpassed 1m.
大雁塔倾斜的原因是长期超采地下水导致地面沉降，在1996年时最大倾斜超过1米。
Over pumping of ground - waters produces a difference in hydrostatic head in favor of the seawater.
过量抽取地下水时，产生利于海水的流体静力学水位差。
Over pumping of ground - waters produces a difference in hydrostatic head in favor of the seawater.
过量抽取地下水时，产生利于海水的流体静力学水位差。
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