Sibualbuali is an eroded Pleistocene stratovolcano with two solfatara fields on the eastern flank.
Rhyolitic-dacitic lava domes erupted from fissure vents along the Toru-Asik fault to the south are late Pleistocene or possibly Holocene in age and are considered part of the Sibualbuali volcanic center (Aspden et al., 1982). Source: Smithsonian GVP
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