Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the Week 11 August – 17 August 2021

Ebeko – Paramushir Island (Russia) : According to volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 6-9 and 11 August produced ash plumes that rose as high as 2.5 km (8,200 ft) a.s.l. and drifted E and SE. A thermal anomaly was identified in satellite images on 6, 9, and 11 August.

Karymsky – Eastern Kamchatka (Russia) : KVERT reported that explosions at Karymsky during 6-13 August produced ash plumes that rose as high as 2.5 km (8,200 ft) a.s.l. Gas-and-steam plumes containing some ash drifted over 60 km SE and SE. A thermal anomaly was identified in satellite images during 7-8 August.

Lewotolok – Lembata Island (Indonesia) : PVMBG reported that the Strombolian eruption at Lewotolok continued during 11-17 August. White, gray, and sometimes black plumes rose as high as 2 km above the summit and drifted S, NW, and W during 10-12 August. Incandescent lava was ejected 200-350 m radially on 10 August, accompanied by banging noises. Ash plumes rose 100-300 m during 13-17 August and drifted NE and W. Incandescence from the SW part of the crater was visible during 15-16 August.

Merapi – Central Java (Indonesia) : BPPTKG reported that both the lava dome just below Merapi’s SW rim and the lava dome in the summit crater remained active during 5-12 August. The domes grew and shed material down the flanks, resulting in relatively stable dome volumes. A total of 28 pyroclastic flows descended the SW flank as far as 3 km; as many as 252 lava avalanches traveled a maximum of 2 km SW and one traveled 500 m SE. BNPB noted that ashfall was reported in 19 villages on 10 August and several on 12 August, in the districts of Dukun, Sawangan, Grabag, Pakis, Tegalrejo, Secang, Srumbung, Salam, Muntilan, and Mungkid. Winds played a role in the extensive distribution of ashfall.

Rincon de la Vieja – Costa Rica : OVSICORI-UNA reported that eruptive events at Rincón de la Vieja were recorded at 1052 on 12 August and 0703 on 13 August, though weather conditions prevented visual confirmation of emissions. Fumarolic activity within the crater increased during 16-17 August.

Sheveluch – Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 6-13 August. Gas-and-steam plumes containing some ash drifted 140 km SW during 7 and 9-12 August. On 11 August the Kamchatka Branch of Geophysical Services (KBGS; Russian Academy of Sciences) reported that the spine had crumbled and incandescent material descended the flanks.

Suwanosejima – Ryukyu Islands (Japan) : JMA reported that 10 explosions at Suwanosejima’s Ontake Crater produced eruption plumes that rose as high as 2.2 km above the crater rim during 6-13 August. Large volcanic bombs were ejected 400 m from the crater. Crater incandescence was visible nightly and ashfall was occasionally reported in Toshima village (4 km SSW).

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