Report on Karangetang (Indonesia) — 17 July-23 July 2002
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 17 July-23 July 2002
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2002. Report on Karangetang (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 17 July-23 July 2002. Smithsonian Institution and US Geological Survey.
2.781°N, 125.407°E; summit elev. 1797 m
All times are local (unless otherwise noted)
During 8-14 July, volcanic activity increased in comparison to the previous week at Karangetang. On July 8 at 1806 an explosion at the main crater produced an ash cloud that rose 1 km above the crater and drifted to the NNW. Lava was visible flowing down the volcano's W slope and burning crops in its path. During the rest of the report week, low-level plumes continued to rise above Karangetang's main crater and Crater II. Karangetang remained at Alert Level 2 (on a scale of 1-4).
Geologic Background. Karangetang (Api Siau) volcano lies at the northern end of the island of Siau, about 125 km NNE of the NE-most point of Sulawesi island. The stratovolcano contains five summit craters along a N-S line. It is one of Indonesia's most active volcanoes, with more than 40 eruptions recorded since 1675 and many additional small eruptions that were not documented in the historical record (Catalog of Active Volcanoes of the World: Neumann van Padang, 1951). Twentieth-century eruptions have included frequent explosive activity sometimes accompanied by pyroclastic flows and lahars. Lava dome growth has occurred in the summit craters; collapse of lava flow fronts have produced pyroclastic flows.