Global Volcanism Program | Image GVP-06435
An eruption plume above the summit of Karengetang (Api Siau) volcano is seen from Ulu village on the northern flank sometime during 1961. Explosive eruptions in that year began on February 28 and lasted until April. Incandescent material was ejected to 300 m above the vent and the eruption plume rose 1.5 km above the crater. Explosive activity also occurred in October 1961.
Photo by M. Pantauw, 1961 (published in Kusumadinata 1979, "Data Dasar Gunungapi Indonesia").