Roundup of Global Volcanic Activity – New Activity for the week of 7 December-13 December 2016
Bezymianny | Central Kamchatka (Russia) : Based on KBGS RAS (Kamchatka Branch of Geophysical Services, Russian Academy of Sciences) data, KVERT noted that seismicity at Bezymianny began to increase on 18 November. The temperature of a thermal anomaly detected in satellite images increased on 5 December, and then significantly increased on 13 December, which was likely caused by lava-dome extrusion. The Aviation Color Code was raised to Orange.
Copahue | Central Chile-Argentina border : Based on satellite and webcam images, the Buenos Aires VAAC reported that during 7-9 and 11 December diffuse gas, water vapor, and ash plumes from Copahue rose to altitudes of 3-3.3 km (10,000-11,000 ft) a.s.l. and drifted NE, E, ESE, and SW. Inclement weather mostly prevented observations on 10 December.
Ebeko | Paramushir Island (Russia) : KVERT reported that, according to observers in Severo-Kurilsk (Paramushir Island) about 7 km E, a gas-and-steam plume containing a small amount of ash rose from Ebeko to an altitude of 1.5 km (4,900 ft) a.s.l., and drifted 6 km N during 8-9 December. The Aviation Color Code was raised to Yellow (the second lowest on a four-color scale). During 9-10 December gas-and-steam plumes with minor amounts of ash rose from two vents, in Sredniy Crater (middle part) and Severny Crater (N part), to altitudes of 1.8-1.9 km (4,900 ft) a.s.l. and drifted 4-5 km NW.
Langila | New Britian (Papua New Guinea) : Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 8-9, 11, and 13 December ash plumes from Langila rose to altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted over 110 km W, WNW, and N.
Sheveluch | Central Kamchatka (Russia) : KVERT reported that during 2-9 December lava-dome extrusion onto Sheveluch’s N flank was accompanied by strong fumarolic activity, dome incandescence, ash explosions, and hot avalanches. Satellite images showed a thermal anomaly over the dome on clear days, and ash plumes drifting 60 km NW on 8 December.
On 10 December explosions generated ash plumes observed in satellite images that rose to altitudes of 10-11 km (32,800-36,000 ft) a.s.l. and drifted 320 km NNE and N. The Aviation Color Code was raised to Red. Satellite images later that day showed a thermal anomaly over the volcano but no ash emissions; the leading edge of the ash plume released earlier was 910 km NNE, drifting at an altitude of 11 km (36,000 ft). The Aviation Color Code was lowered to Orange.