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

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 (Aft) and the Bouguer density (pB) 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 that the value of the Bouguer anomaly becomes invariant for any Bouguer density’, and have shown an approximate equation to be satisfied by Afl and pB. Also, we have shown an explicit formula to estimate Afl. These two simultaneous equations enable us to estimate both Afl and pB. 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.