Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the Week 25 December 2019 – 31 December 2019

Aira | Kyushu (Japan) : JMA reported that during 23-27 December there were three explosions and one non-explosive eruptive event detected by the Minamidake Crater (at Aira Caldera’s Sakurajima volcano) seismic network. Ash plumes rose as high as 3.3 km above the crater rim and material was ejected 600-900 m away from the crater. Crater incandescence was visible at night and minor eruptive activity continued during 27-30 December. The Alert Level remained at 3 (on a 5-level scale).

Dukono | Halmahera (Indonesia) : Based on satellite and wind model data, and information from PVMBG, the Darwin VAAC reported that during 25-31 December ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted in multiple directions. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.

Ebeko | Paramushir Island (Russia) : Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 22-24 December that sent ash plumes up to 3 km (10,000 ft) a.s.l. Ash plumes drifted NE. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Etna | Sicily (Italy) : INGV reported that Strombolian activity at Etna’s New Southeast Crater and North East Crater continued during 23-29 December, though had significantly decreased compared to previous weeks. Sporadic ash emissions from Voragine Crater rapidly dispersed into the atmosphere.

Ibu | Halmahera (Indonesia) : The Darwin VAAC reported that on 26 December discrete ash puffs from Ibu were identified in satellite images rising to 2.1 km (7,000 ft) a.s.l. and drifting S. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay at least 2 km away from the active crater, and 3.5 km away on the N side.

Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that Strombolian activity at Klyuchevskoy and a weak thermal anomaly identified in satellite images were recorded each day during 17-27 December. A gas-and-steam plume drifted 16 km NE on 22 December. The Aviation colour Code remained at Orange.

Sabancaya | Peru : Instituto Geofísico del Perú (IGP) reported that a daily average of eight low-to-medium intensity explosions occurred at Sabancaya during 23-29 December. Gas-and-ash plumes rose as high as 2.5 km above the summit and drifted NE, E, and SW. There were five thermal anomalies identified in satellite data, originating from the 280-m-diameter lava dome in the summit crater. The Alert Level remained at Orange (the second highest level on a four-colour scale) and the public were warned to stay outside of a 12-km radius.

Sangeang Api | Indonesia : The Darwin VAAC reported that during 25-28 December discrete minor ash emissions from Sangeang Api rose to altitudes of 2.4-3 km (8,000-10,000 ft) a.s.l. and drifted W, SW, and E. The Alert Level remained at 2 (on a scale of 1-4).

Sheveluch | Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 17-27 December. Ash plumes drifted E on 22 December. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Shishaldin | Fox Islands (USA) : AVO reported that the eruption at Shishaldin continued during 25-31 December. Seismicity was elevated with weak explosions recorded by the network during 26-27 December. The seismicity decreased to relatively low levels on 27 December and remained low through 31 December. Strongly elevated surface temperatures were periodically identified in satellite images, indicating continuing lava effusion; images acquired during 25-26 December confirmed a 1.5-km-long lava flow on the NW flank and tephra deposits on the upper flanks. The Aviation colour Code remained at Orange and the Volcano Alert Level remained at Watch.

Stromboli | Aeolian Islands (Italy) : INGV reported that during 23-29 December activity at Stromboli was characterized by ongoing explosive activity mainly from three vents in Area N (north crater area) and at least three vents in Area C-S (south central crater area). On 27 December lava began effusing from a vent in Area C-S and traveled a few hundred meters in the upper part of the Sciara del Fuoco. Variable-intensity explosions from Area N occurred at a rate of 3-17 events per hour and ejected lapilli and bombs 80m to at least 150 m above the vents. Ejected tephra fell onto the flanks and some blocks rolled a few hundred meters along the Sciara del Fuoco. Spattering occurred from vents in the S part of Area N. Medium- to- high-intensity explosions from Area C-S occurred at a rate of 6-12 events per hour and ejected coarse material to heights sometimes greater than 150 m above the vents. Material was deposited along the upper parts of the Sciara del Fuoco.

Suwanosejima | Ryukyu Islands (Japan) : JMA reported that incandescence at Suwanosejima’s Ontake Crater was visible during 20-27 December. Eruptive events generated grayish plumes that rose as high as 800 m above the crater rim and material was ejected as far as 600 m from the crater; there were nine explosions recorded during 25-26 December. The Alert Level remained at 2 (on a 5-level scale).

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