Volcano Watch No. 40

1 – 7 October 2008

New Activity/Unrest:

• Garbuna Group, New Britain
• Karangetang [Api Siau], Siau Island
• Ol Doinyo Lengai, Tanzania
• Piton de la Fournaise, Reunion Island
• Redoubt, Southwestern Alaska
• Soputan, Sulawesi [Indonesia]

Karangetang [Api Siau] Photo

Karangetang (Api Siau) volcano lies at the northern end of the island of Siau, north of Sulawesi. The 1784-m-high stratovolcano contains five summit craters along a N-S line. Karangetang 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 has also produced pyroclastic flows. Photo by Volcanological Survey of Indonesia. Caption and details: GVP.

Volcano: Karangetang [Api Siau]
Country: Indonesia
Region: Sangihe Islands (Indonesia)
Volcano Type: Stratovolcano
Last Known Eruption: 2008
Summit Elevation: 1784 m     5,853 feet
Latitude: 2.78°N     2°47’0″N
Longitude: 125.40°E     125°24’0″E

Ongoing Activity:

• Anatahan, Mariana Islands (Central Pacific)
• Batu Tara, Komba Island (Indonesia)
• Chaitén, Southern Chile
• Karymsky, Eastern Kamchatka
• Kilauea, Hawaii (USA)
• Manam, Northeast of New Guinea (SW Pacific)
• Rabaul, New Britain
• Sakura-jima, Kyushu
• Shiveluch, Central Kamchatka (Russia)
• Soufrière Hills, Montserrat
• Suwanose-jima, Ryukyu Islands (Japan)
• Turrialba, Costa Rica
• Ubinas, Perú

This Weekly Volcanic Activity Report is a cooperative project between the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.