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长方体可以组合成各种不规则的三度体,下面的长方体重力异常公式常常成为解释方法中的基本公式: 其中R~2=(ξ-x)~2+(η-y)~2+(ζ-z)~2;x、y、z为测点坐标;ξ、η、ζ为长方体每个角点的坐标。这个公式精度虽高,但计算费时,造成在有些机器上某些解释方法不能实现。在区城重力资料解释中,为了加快计算速度,我们将上述公式简化为:
The cuboids can be combined into a variety of irregular third-degree bodies. The following formula for the rectangular parallelepiped gravity anomaly is often the basic formula for interpretation: where R ~ 2 = (ξ-x) ~ 2 + (η-y) ~ 2 + ( ζ-z) ~ 2; x, y, z are the coordinates of the measuring point; ξ, η, ζ are the coordinates of each corner point of the cuboid. The accuracy of this formula is high, but the calculation is time-consuming, resulting in that some of the interpretation methods on some machines can not be achieved. In the city gravity data interpretation, in order to speed up the calculation speed, we will simplify the above formula: