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。
The inclination and thickness of coal strata are main influencing factors of ground subsidence.
煤层的倾角、厚度等物理条件是地表沉陷的主要影响因素。
The effect of rate of change for semimajor axis and inclination perturbation and drift of semimajor axis and inclination on the ground-track drift was analyzed.
分析了半长轴和倾角摄动变化率，以及初始半长轴和倾角偏置量对地面轨迹漂移的影响。
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