The effectiveness of the electrical resistivity methods has been studied using various configurations over the Filwoha Faul t. It has been opserved that the del inea tionof the faul t was possible under differential weathering. Geoelectric sections across the fault has been prepared on the basis of Schlumberger sounding results. In profiling three diffllrent electrode configurations namely Wenner, two-electrode and half-Schlumberger, were used along profile AA' and Wenner only in Profile BB'. On,the basis of data obtained from profiles AA' and BB' it was possible to delineate the strike and extent of the fault \d thin Addis Ababa. Furthermore, the interpretation of the resul ts in AA' su!!/!ests that the two-electrode configuration posses a certain diagnostic feature which heln in mapping latteral contact of this type. The age of the fault is es timated to be between 5. O~la and 6.4 M.yrs. and the down thrown side is to the south.