Figure 6: (a) Bouguer gravity anomaly
map; (b) spectral analysis derived from the Bouguer gravity anomaly
; and (c) gravimetric profile A-A' (see Figure 1) showing sedimentary deposits and the rocky basement.
Finally, the program subtracted the earth model gravity from the observed gravity to give the complete Bouguer gravity anomaly
(CBOG) for each station.
The regional Bouguer gravity anomaly
reported by Ethier (2001) crosses north-striking surficial geological units obliquely, implying deeper level structures lie on a NNE to NE trend.
In this research the simple Bouguer gravity anomaly
is used in comparisons.
where [DELTA][g.sup.B] is the refined Bouguer gravity anomaly
, and [g.sup.c] the gravitational attraction of isostatic compensation masses (see also Bjerhammar, 1962, Chap.
The regional correction was calculated from topography using Airy's model of crustal compensation and subtracted from the Bouguer gravity anomaly
, which then produced an isostatic residual gravity map of the study area.