For the possible assessment of geothermal resources it is nccessaty to obtain additionalrngeophysical infollnation fium the gravity survey regarding the Shalla caldera and its environs.rnAll available data, over 1041 stations, obtained from the EGS were reduced to sea level with arnuniform cl1lstal density of 2.67 gmicm3 Effects Bouguer masses were calculated applying thernsimple Bouguer correction. TelTain correction was not applied in which case its effect wasrntreated as systematic error in computing the over all mean square elTor of the simple Bouguerrnanomalies at each station. Theoretical gravity field was computed by means of the internationalrngravity fOllnula of 1967 (GRS67) and tied to the IGSN71. The accuracy of the Bouguerrnanomaly at each station is calculated to about Â± 2.82 mgal.rnThe data shows that the study area is characterised by short wavelength positive Bouguerrngravity anomaly of the Ethiopian Rift. The observations define a line of positive residual gravityrnanomalies due to the mass excesses below the rift floor associated with strong hydrothellnalrnactivities in the rift. There is strong correlation between the positive residual gravity anomaliesrnin the rift following the strike of the WFB, the geothermal activity and the location ofrnQuaternaty siliceous domes and recent fissural basalt flows. The root of the denser fissuralrnbasalt's may be still hot and the siliceous domes of the Shalla caldera geothermal field withrnstrong hyrdrothellnal manifestations more likely have hot basaltic dykes underneath associatedrnwith their magma chambers that feed their thernlal features. In general all the geothelmalrnactivity north of Shalla caldera may be related with the Alutu-Langano geothelmal field throughrnthe recent complex volcanic stl1lctures and the active trending fault system. Similarly therngeothelmal activity south of Shalla caldera may be ascribed to the Corbetti caldera through thernShalla-Corbetti segment of the Wonji Fault Belt.