12/06/2015. Asama, Karangetang .
Asama, Japon :
Volcanic alert raised for Mt. Asama
Aerial photo taken on June 11, 2015, shows Mt. Asama located about 140 kilometers northwest of Tokyo. The Japan Meteorological Agency raised the volcanic alert for the mountain from 1, or “be mindful that the volcano is potentially active,” to 2, or “do not approach the crater” among the five levels the same day.
Asamayama, Honshu’s most active volcano, overlooks the resort town of Karuizawa, 140 km NW of Tokyo. The volcano is located at the junction of the Izu-Marianas and NE Japan volcanic arcs. The modern Maekake cone forms the summit and is situated east of the horseshoe-shaped remnant of an older andesitic volcano, Kurofuyama, which was destroyed by a late-Pleistocene landslide about 20,000 years before present (BP).
Growth of a dacitic shield volcano was accompanied by pumiceous pyroclastic flows, the largest of which occurred about 14,000-11,000 BP, and by growth of the Ko-Asama-yama lava dome on the east flank. Maekake, capped by the Kamayama pyroclastic cone that forms the present summit, is probably only a few thousand years old and has an historical record dating back at least to the 11th century CE. Maekake has had several major plinian eruptions, the last two of which occurred in 1108 (Asamayama’s largest Holocene eruption) and 1783 CE.
Source : kyodonews.jp , GVP
Photos : kyodonews , Oregonstates
Karangetang , Siau Island, Sangihe Islands, Indonesia :
Activity continues at the volcano with the effusion of a lava flow from the summit vent of the volcano and associated glowing avalanches.
Pyroclastic flows in early May destroyed some houses and prompted the evacuation of more than 100 families in nearby villages.
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.
Source : Volcanodiscovery , GVP
Photo : Chinanews