What is the coverage of the asphalt fields?
In south Buton alone, the asphalt fields occur along down block-faulted zones of 5 to 7 km wide that developed on the east side of a NNE SSW trending somewhat sigmoidal wrench fault extending about 75 km from bays of Sampolawa to Lawele. In north Buton, the areas surrounding two districts are really underlain by beds which are susceptible for asphalt impregnation especially along the zone of their boundary.