Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the Week 5 August 2020 – 11 August 2020

Aira | Kyushu (Japan) : JMA reported that the daily sulfur dioxide emission rate at Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was 700 tons/day on 3 August. An explosion at 0538 on 9 August produced an ash plume that rose as high as 5 km above the crater rim; ejected blocks were not visually confirmed due to weather conditions. Ashfall was reported in areas N of the crater including Kagoshima City (about 10 km W), Kirishima City (20 km NE), Yusui Town (40 km N), and parts of the Miyazaki Prefecture and the Kumamoto Prefecture. After the explosion at 0538, smaller eruptions were intermittently detected through 10 August. 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 5, 7, and 9-11 August ash plumes from Dukono rose to 1.8-2.1 km (6,000-7,000 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 volcano, observed explosions on 30 July and during 1-2 and 6 August that sent ash plumes up to 3.5 km (11,500 ft) a.s.l. and drifted E. A thermal anomaly over the volcano was identified in satellite images on 6 August; weather clouds obscured views on the other days during 1-7 August. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Etna | Sicily (Italy) : INGV reported that during 27 July-9 August activity at Etna was characterized by intra-crater Strombolian activity at Northeast Crater (NEC), sporadic Strombolian activity at Voragine Crater (VOR) with minor ash emissions that quickly dispersed, and both Strombolian activity and diffuse ash emissions at the New Southeast Crater (NSEC) cone. Explosive activity increased on 31 July; an ash cloud rose to 4.5 km (14,800 ft) a.s.l. On 2 August very minor ashfall was reported in Trecastagni and Acicastello, possibly from a slight increase in explosive activity that was not visually confirmed. During 3-9 August Strombolian activity ejected material above the NSEC cone’s crater rim; the activity was almost continuous during the evening of 6 August and the next morning, and booming was heard several kilometers away. Ash emissions dispersed near the summit. A series of ash emissions were visible in the morning of 9 August.

Ibu | Halmahera (Indonesia) : PVMBG reported that on 5 August an ash plume rose 500 m above Ibu’s summit and drifted N. A few hours later the Darwin VAAC reported that an ash plume rose to 4.3 km (14,000 ft) a.s.l., or 2.9 km above the summit. 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.

Karymsky | Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 5-6 August; weather clouds prevented views of the volcano on the other days during 1-7 August. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Kerinci | Indonesia : PVMBG reported that at 1024 on 7 August a brown ash emission from Kerinci rose 600 m above the summit and drifted NE, E, and SE. At 1140 on 9 August a brown ash plume rose 600 m above the summit and drifted ENE. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 3-km exclusion zone.

Rincon de la Vieja | Costa Rica : OVSICORI-UNA reported that phreatic activity at Rincón de la Vieja had significantly decreased compared to activity during January-May. Events were recorded at 0546 on 5 August and at 1000 on 8 August, but not visually confirmed due to weather conditions. A phreatic explosion at 0035 on 6 August generated a plume that rose 500 m above the crater rim. Small steam plumes were visible on 10 August; one at 0845 was likely produced from a small phreatic event. Another s small phreatic event was detected later that day at 2346.

Sabancaya | Peru : Instituto Geofísico del Perú (IGP) reported a daily average of 19 explosions at Sabancaya during 3-9 August. Gas-and-ash plumes rose as high as 2.5 km above the summit and drifted SE, S, SW, and NW. There were five thermal anomalies over the crater identified in satellite data. 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.

Sangay | Ecuador : IG reported a high level of activity at Sangay during 5-11 August. Weather clouds often prevented visual observations of the volcano; according to Washington VAAC notices and IG webcams ash plumes rose 870-2,000 m above the summit and drifted NW, W, and S almost daily. Heavy rain generated secondary lahars in the Volcán and Upano drainages during 5-7 August.

Semeru | Eastern Java (Indonesia) : PVMBG reported that the eruption at Semeru continued during 5-11 August, though sometimes foggy conditions prevented visual confirmation. Ash plumes rose 400-500 m above the summit and drifted N on 8 August. The Alert Level remained at 2 (on a scale of 1-4), and the public was reminded to stay outside of the general 1-km radius from the summit and 4 km on the SSE flank.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 1-7 August. A moderate explosion produced a small ash plume that rose to 4.5 km (14,800 ft) a.s.l. and drifted SE and E on 2 August according to the Kamchatka Branch of Geophysical Services (KBGS; Russian Academy of Sciences). The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Suwanosejima | Ryukyu Islands (Japan) : JMA reported occasional eruptive events, three explosions, and occasional nighttime incandescence at Suwanosejima’s Ontake Crater during 31 July-7 August. An explosion at 1553 on 1 August generated an ash plume that rose 1.8 km above the crater rim. The Alert Level remained at 2 (on a 5-level scale).

Turrialba | Costa Rica : OVSICORI-UNA reported that there were 19 minor ash emissions recorded at Turrialba during 4-5 August, with event durations lasting no longer than three minutes and plumes rising no higher than 200 m above the summit. Four more events were recorded on 5 August, with event durations lasting less than 10 minutes. Plumes again rose no higher than 200 m.

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