Karymsky, Russia

KVERT reported that during 5 and 9-10 December seismic activity at Karymsky was at background levels; possible explosions may have generated ash-and-gas plumes to an altitude of 2.8 km (9,200 ft) a.s.l. Volcanologists occasionally saw ash plumes rise to altitudes of 2 km (6,600 ft) a.s.l. and drift E. Ash deposits on the E flank [...]

Galeras, Colombia

INGEOMINAS reported that thermal images of the lava dome in Galeras’s crater were taken during an overflight on 11 December. The images revealed temperatures as hot as 530 degrees Celsius on the N side of the dome and temperatures near 80 degrees Celsius on the W side. Temperatures had declined compared to thermal images taken [...]

Fuego, Guatemala

Based on NOTAM’s (“Notices to Airmen”), the Washington VAAC reported that on 9 December a possible gas-and-ash plume from Fuego rose to an altitude of 4.9 km (16,000 ft) a.s.l., drifted N, and dissipated rapidly. INSIVUMEH reported that on 12 December explosions produced ash plumes that rose to altitudes of 4.1-5 km (13,500-16,400 ft) a.s.l. [...]

Dukono, Halmahera, Indonesia

Based on analysis of satellite imagery, the Darwin VAAC reported that on 15 December an ash plume from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted about 160 km SE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological [...]

Colima, Mexico

During 9-16 December, gray and white plumes from Colima rose to altitudes of 3.9-4.5 km (12,800-14,800 ft) a.s.l. Plumes occasionally drifted SE and N. On 11 December, a gray plume rose to an altitude of 5.8 km (19,000 ft) a.s.l.
Source: Gobierno del Estado de Colima – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program [...]

Bagana, Papua New Guinea

Based on analysis of satellite imagery, the Darwin VAAC reported that on 16 December an ash plume from Bagana rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted SW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards [...]

Tungurahua, Ecuador

The IG reported that activity from Tungurahua on 15 December was characterized by increased seismicity, ash emissions, and the ejection of incandescent blocks. Ash plumes rose to an altitude of 6 km (19,700 ft) a.s.l. and drifted NE. Ashfall was reported 6 km NNE in Runtún. Observers at the Tungurahua Observatory (OVT) in Guadalupe, 11 [...]

Soufriére Hills, Montserrat, West Indies

MVO reported that seismicity from Soufrière Hills lava dome remained elevated during 6-10 December. On 10 December, seven pyroclastic flows traveled W down Gages Valley, at least two reached Plymouth (about 5 km W). A few small pyroclastic flows were detected during 11-12 December. Monitoring data indicated that the volcano continued to inflate.
Based on analysis [...]

Sangay, Ecuador

Based on analysis of satellite imagery, the Washington VAAC reported that a small gas-and-steam plume with some ash rose from Sangay on 16 December.
Source: Washington Volcanic Ash Advisory Center (VAAC)   – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”
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Piton de la Fournaise, Reunion Island, Indian Ocean

OVPDLF reported that a seismic crisis at Piton de la Fournaise on 14 December was characterized by hundreds of earthquakes, many greater than M 2.5. On 15 December, an eruption began from two fissures inside Dolomieu crater and produced low-velocity lava flows that ponded at the bottom, covering about 20 percent of the 21 September [...]