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在重磁异常解释中,经常用一个或几个规则的棱柱体表示地质体作正演计算.对于三度体用常规手工方法作正演计算,困难很大.六十年代开始采用似二度量板,才使这种计算得以实现.但量板的制作很麻烦,计算精度也难以保证.现在带程序的计算器已广泛使用,三度体的正演计算于是变得轻而易举了. 下面介绍对于走向长度有限(上、下底水平)的倾斜板状体,在垂直其走向的剖面上△Z的正演计算.设倾斜板状体的水平宽度为2 b,走向长度为2 L,倾斜长度为2l,埋深为h,板与水平方向的倾角为β,剖面内有效磁化强度为J,有效磁化强度方向为i.其磁场垂直分量△Z的计算公式为
In the interpretation of gravity and magnetic anomaly, often using one or several regular prisms for the forward calculation of the geological body.For the third body using the conventional manual method for forward calculation, difficult.From the sixties began to adopt two similar measures Plate, only to make this calculation can be achieved, but the volume of the board is very troublesome, the calculation accuracy is difficult to guarantee now with the calculator program has been widely used, three-dimensional body forward calculation so it becomes easier. Toward the finite length (upper and lower bottom level) of the inclined plate-shaped body, perpendicular to the direction of its profile in the forward calculation of △ Z. Set the inclined plate-shaped body horizontal width of 2 b, the length of 2 L, length of inclination Is 2l, the depth is h, the inclination of the plate with the horizontal direction is β, the effective magnetization in the section is J, and the direction of the effective magnetization is i. The calculation formula of the vertical component of the magnetic field ΔZ is