Gravity modelling of an interface above which the density contrast decreases hyperbolically with depth

Abstract

An interpretational procedure for determining the depth of an interface underlying sediments whose density contrast decreases hyperbolically with depth is developed. The approximate depth of the interface at each gravity station is calculated by using the gravity formula of an infinite slab with a hyperbolic density contrast. Based on these depth values, the sediment—basement interface is replaced by an n-sided polygon. Its gravity anomaly is computed by using the formula of Visweswara Rao et al. (1994). These depth values are refined using the procedure of Bott (1960).