Generalized Bouguer gravity anomaly (2): possibility of constructing Bouguer gravity anomaly distribution with no gravitational effect due to topographic undulation

Abstract

Based on the newly defined formula of a spherical Bouguer anomaly, the authors have proposed a new method intending to determine the regional VGG anomaly (Db) and the Bouguer density (rB) so as to satisfy the condition of eliminating the topographic gravitational effects. For this purpose, we have introduced a new concept of ?the datum level such thatthe value of the Bouguer anomaly becomes invariant forany Bouguer density?, and have shown an approximate equation to be satisfied by Db and rB. Also, we have shown an explicit formula to estimate Db. These two simultaneous equations enable us to estimate both Db and rB. These quantities and subsequently conducted gravity corrections will give a new way to construct Bouguer anomaly distribution with no gravitational effect due to topographic undulation.