The image above represents gravity anomaly for a semi-infinite horizontal sheet.

To compute for gravity anomaly for a semi-infinite horizontal sheet, five essential parameters are needed and these parameters are **Gravitational Constant (G), Anomalous Density (Δρ), Thickness of the Sheet (t), ****Horizontal Distance (x)** and** Depth Buried (d).**

The formula for calculating gravity anomaly for a semi-infinite horizontal sheet:

δg_{z} = 2GΔρt [^{π}/_{2} + tan^{-1}(^{x}/_{d})]

Where:

δg_{z} = Gravity Anomaly for a Semi-Infinite Horizontal Sheet

G = Gravitational Constant

Δρ = Anomalous Density

t = Thickness of the Sheet

x = Horizontal Distance

d = Depth Buried

Let’s solve an example;

Find the gravity anomaly for a semi-infinite horizontal sheet when the gravitational constant is 6.67E-11, the anomalous density is 12, the thickness of the sheet is 14, the horizontal distance is 18 and the depth buried is 5.

This implies that;

G = Gravitational Constant = 6.67E-11

Δρ = Anomalous Density = 12

t = Thickness of the Sheet = 14

x = Horizontal Distance = 18

d = Depth Buried = 5

δg_{z} = 2GΔρt [^{π}/_{2} + tan^{-1}(^{x}/_{d})]

δg_{z} = 2(6.67e-11)(12)(14) [^{π}/_{2} + tan^{-1}(^{18}/_{5})]

δg_{z} = 2.2411200000000002e-8 [1.570 + tan^{-1}(3.6)]

δg_{z} = 2.2411200000000002e-8 [1.570 + 74.475]

δg_{z} = 2.2411200000000002e-8 [76.046]

δg_{z} = 0.000001704

Therefore, the **gravity anomaly for a semi-infinite horizontal sheet** is **0.000001704 mGal.**