gravity vertical gradient [地物] 重力垂向梯度
gravity vertical gradient survey [地物] 重力垂向梯度测量
disturbing gravity vertical gradient 扰动重力垂直梯度
vertical gradient of gravity anomaly 重力异常垂直梯度
By very simple mathematical derivations, the practical expression of (Vzz), the expression of normal vertical gravity gradient, and the comment on the accuracy were given.
本文以极简单的数学推导，给出了正常重力垂直梯度的实用表达式，并对其精度作出了评价。
Therefore it is considered that the decrement of gravity vertical gradient is caused by mountain mass distribution.
分析了佘山重力垂直梯度偏小的原因，认为这是由于山体质量分布引起的。
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