Self-potential (SP) measurements were carried out along two survey lines (23.5 km total length) across the Ulubelu geothermal prospect (South Sumatra, Indonesia) in 1991 by the Geothermal Division of Pertamina. The results show long wavelength positive and negative anomalies associated with the geothermal prospect. A quantitative interpretation of the data indicated that these SP anomalies can be explained by electrical potentials generated along four dipping planes located at 0.8 and 1.5 km below the ground surface, which probably represent interactions between faults and geothermal activity at depth.

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