Volcanos

Roundup of Global Volcanic Activity

Augustine volcano (Alaska): Strong ash emissions from the volcano were reported by a pilot shortly after midnight (UTC). The reported height of the plume was to up to 70,000 ft (21 km) altitude, which would indicate an unexpected, and sudden major explosion took place (if the observed plume was volcanic ash and not something else). Anchorage VAAC raised the Aviation Colour Code to RED. No ash could be identified on satellite imagery, and the Alaska Volcano Observatory (AVO) has not issued any comment. In a subsequent VAAC, "ash emissions have ended", Anchorage wrote. It seems likely an unusual weather cloud had been mistaken for a volcanic plume.

Shishaldin volcano (United States, Aleutian Islands) Low-level eruptive activity likely continues at the volcano, AVO writes: "Elevated surface temperatures were detected in satellite data from this morning. Sound waves coupling into the ground (ground-coupled air waves) from small explosions as well as small pulses of tremor are occasionally detected in seismic data." (AVO)

Dukono volcano (Halmahera, Indonesia) activity update Ash emissions continue. Darwin VAAC reported several ash plumes rising to estimated 8,000 ft (2.4 km) altitude and extending up to approx. 100 km NE.

Ibu volcano (Halmahera, Indonesia) A viscous lava flow continues to be active on the northern flank of the volcano. The flow, similar to the one currently active at Santiaguito volcano in Guatemala, starts as an overflow from the lava dome in the crater, and forms a lobe traveling through a breach of the crater rim into a ravine extending north of the volcano. Based on satellite data, it was about 1600-1700 m long in early September, and had been progressing at approx. 6 m per day. According to eyewitness reports, weak to moderate explosive activity accompanies the extrusion of the flow. The volcano's current activity phase of dome-building had begun in 1998.

Stromboli volcano (Eolian Islands, Italy): decreasing lava flow activity. There are signs that the lava flow eruption could be approaching an end soon. Lava effusion rate has dropped although a weak lava flow continues to be active on the upper part of the Sciara del Fuoco. INGV Catania reports strong degassing and that ash emissions from the summit vents have decreased.