Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the Week 27 May 2020 – 2 June 2020

Aira | Kyushu (Japan) : JMA reported that during 25 May-1 June incandescence from Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was visible almost nightly. The daily sulfur dioxide emission rate was high. There were three explosive events and 18 eruptive events during 25-29 May with plumes rising as high as 3 km above the crater rim. Material was ejected 800-1,100 m away from the crater. An eruption at 1337 on 1 June generated an ash plume that rose to 3 km. The Alert Level remained at 3 (on a 5-level scale).

Asosan | Kyushu (Japan) : JMA reported that eruptive activity at Asosan was recorded during 29 May-2 June. Volcanic plumes rose 1,000-1,600 m above the crater rim. The sulfur dioxide emission rate was high; the rate was 1,000 tons per day on 27 May. The Alert Level remained at 2 (on a scale of 1-5).

Dukono | Halmahera (Indonesia) : Based on satellite and wind model data, and information from PVMBG, the Darwin VAAC reported that during 27 May-2 June ash plumes from Dukono rose to 2.1 km (7,000 ft) a.s.l. and drifted NW and W. 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 22-29 May that sent ash plumes up to 4.6 km (15,100 ft) a.s.l. The plumes drifted E and 60 km SE, causing ashfall in Severo-Kurilsk on 22 and 24 May. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Nevado del Ruiz | Colombia : Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 27 May-2 June seismicity at Nevado del Ruiz was at similar levels to the week before, with signals dominated by periods of continuous volcanic tremor, tremor pulses, long-period, and very-long-period earthquakes. Some of the earthquakes were associated with minor gas-and-ash emissions that drifted N and were recorded by the webcam. The highest gas-and-steam plume rose about 1.3 km above the summit, recorded on 29 May. The Alert Level remained at 3 (Yellow; the second lowest level on a four-color scale).

Reventador | Ecuador : IG reported that during 27 May-2 June seismic data from Reventador’s network indicated a high level of seismic activity, including explosions, long-period earthquakes, and signals indicating emissions. Gas, steam, and ash emissions observed daily with the webcam or reported by the Washington VAAC rose as high as 1.4 km above the summit crater and drifted N, NW, W, and SW. Cloudy weather sometimes prevented views of the volcano. Incandescent blocks rolled as far as 500 m down the S and E flanks during 27-28 May. Nighttime crater incandescence was visible during 27-28 and 30 May, as well as during 1-2 June.

Rincon de la Vieja | Costa Rica : OVSICORI-UNA reported that periodic phreatic explosions at Rincón de la Vieja continued to be recorded by the seismic network and webcams during 26-29 May and 1-2 June. Some of the events were not visually confirmed by webcams because of weather conditions or darkness. On 26 May a minor amount of ash fell in areas to the NW including in Los Angeles of Quebrada Grande, and Liberia. A phreatic eruption at 1521 on 27 May generated a plume that rose 1.5 km above the crater rim. At 1524 on 28 May an event generated a plume that rose 3 km above the rim and drifted W. Phreatic eruptions at 1745 on 1 June, and at 1446 and 1701 on 2 June produced plumes that rose 1-2 km.

Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that Strombolian activity at Klyuchevskoy was visible during 22-29 May along with a bright thermal anomaly identified in satellite images. A lava flow continued to advance down the Apakhonchich drainage on the SE flank. Gas-and-steam plumes with some ash drifted over 200 km E during 22 and 25-28 May. The Aviation Color Code remained at Orange.

Semeru | Eastern Java (Indonesia) : PVMBG reported that the eruption at Semeru continued during 27 May-2 June, though sometimes weather conditions prevented visual confirmation. Ash plumes rose 300-500 m above the crater and drifted N, W, and SW on most days. White plumes rose 300 m and drifted N during 26-27 May. 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 22-29 May. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Suwanosejima | Ryukyu Islands (Japan) : JMA reported that nighttime incandescence at Suwanosejima’s Ontake Crater was visible during 22-29 May. Five explosions were recorded, producing plumes that rose as high as 700 m above the crater rim. The Alert Level remained at 2 (on a 5-level scale).

Whakaari/White Island : On 29 May GeoNet reported that activity at Whakaari/White Island continued in an elevated state of unrest. Gas and observations flights have resumed; sulfur dioxide and carbon dioxide gas flux increased from 20 to 27 May, possibly indicating a new body of magma at a shallow depth. Areas of lava remained hot on 20 May with temperatures around 500 degrees Celsius. Incandescence from gas emissions around the lobes was visible in nighttime webcam images. Tremor levels remained low overall, punctuated with occasional episodes of slightly elevated tremor. Some shallow-source volcanic earthquakes were recorded. Satellite-based measurements showed several centimeters of subsidence since the December 2019 eruption. The Volcanic Alert Level remained at 2 and the Aviation Color Code remained at Yellow.

Yasur | Vanuatu : On 28 May the Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported that recent visual observations at Yasur confirmed ongoing explosions and gas-and-ash emissions. The report noted that some of the explosions could be intense and eject bombs outside of the summit crater. The Alert Level remained at 2 (on a scale of 0-4). VMGD reminded residents and tourists that hazardous areas were near and around the volcanic crater, within a 600-m-radius exclusion zone, and that volcanic ash and gas could reach areas impacted by trade winds.

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