西安地区由于过量开采地下水，引起地面急剧沉降。
The main reason for the ground subsidence is the excessive exploitation of underground water.
重力变化的主要原因是过量开采地下水，使含水系统压密，从而导致地面重力变化。
The main cause of the gravity variation is that groundwater has been over mined, thus, hydrous system is so pressed that ground gravity varies.
西安地区由于过量开采地下水，引起地层压密效应，造成地面急剧下沉与重力值急剧增加。
In Xi 'an area, because the groundwater has excessively been exploited, the press-dense effect of strata appears so that the ground subsides and the gravity value increases sharply.
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