**8.1 Bouguer graph**

The data were converted from excel to data file format using grapher software. Its grid and contour maps were obtained using surfer software. The Bouguer map in **Figure 2** indicates that the Bouguer anomaly of the study area varies from 60 to 4 mGal. Low gravity anomalies are observed in the map with its minimum value appearing in around 11.69°N–11.85°N, 11.2°E–11.33°E, and 11.0°N–11.2°N, 11.5°E–11.7°E. Meanwhile, Bouguer gravity anomalies are maximum around 11.70° N–11.80°N, 12.73°E–12.84°E.
