Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the Week 3 June 2020 – 9 June 2020

Aira | Kyushu (Japan) : JMA reported that during 1-8 June incandescence from Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was sometimes visible at night. An explosion at 0259 on 4 June produced a plume that rose 1.5 km above the crater rim and ejected material almost 2 km away from the crater. Vibrations from the explosion were detected at the Seto Observatory, 4 km from the crater. During field surveys on 4 and 8 June deposits of tephra (up to 5 cm in diameter) were observed in areas 4-5 km E, and large blocks had fallen 3 km SW; craters created from the impact of the blocks were about 6 m in dimeter and 2 m deep. An explosion at 0130 on 5 June generated a plume that rose 3.7 km above the rim. 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 3-5 and 9 June ash plumes from Dukono rose to 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted NW, SW, S, and NNE. 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 29-31 May and 1 June that sent ash plumes up to 4.5 km (14,800 ft) a.s.l. Ash plumes drifted E and S. A thermal anomaly over the volcano was identified in satellite images during 30 May and 1-2 June. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that Strombolian activity at Klyuchevskoy was visible during 29 May-5 June 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 465 km SE and E on 29 and 31 May, and 1 June. The Aviation colour Code remained at Orange.

Nevados de Chillan | Chile : SERNAGEOMIN reported that a long-period earthquake beneath Nevados de Chillán was recorded at 0417 on 6 June. An emission associated with the earthquake rose more than 760 m above the vent and drifted NE. Pyroclastic flows descended the NW, N, E, and SE flanks. The Alert Level remained at Yellow, the second lowest level on a four-colour scale, and residents were reminded not to approach the crater within 3 km. ONEMI modified their Alert Level status on 19 March, noting that an Alert Level Yellow (the middle level on a three-colour scale) was in place for the communities of Pinto and Coihueco, and that the public should stay at least 2 km away from the crater.

Sabancaya | Peru : Instituto Geofísico del Perú (IGP) reported that a daily average of 18 explosions occurred at Sabancaya during 1-7 June. Gas-and-ash plumes rose as high as 1.5 km above the summit and drifted E and SE. There were three thermal anomalies identified in satellite data, originating from the 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.

Sangay | Ecuador : IG reported that in the evening of 8 June, through the next morning, an eruptive event at Sangay was characterized as the collapse of one or more lava-flow fronts. Pyroclastic flows descended the Volcán River on the SE flank, and based on thermal anomalies some reached the Upano River. The Washington VAAC stated that ash plumes drifted SW. Several regional communities downwind reported ashfall including Santa Elena (170 km W), Guayas (175 km W), Los Ríos, Chimborazo, and the Morona-Santiago province. The most significant ashfall occurred in Alausí (60 km WSW). The local seismic station stopped transmitting signals on 7 June, though stations located tens of kilometers N recorded signals from the event beginning around 2000 on 8 June and lasting several hours.

Semeru | Eastern Java (Indonesia) : PVMBG reported that the eruption at Semeru continued during 1-7 June, though sometimes foggy conditions prevented visual confirmation. Dense white-to-gray plumes rose 100-400 m above the summit. Incandescent material from the ends of lava flows descended 200-400 m in the Kembar drainage (on the S flank), reaching a maximum distance of 1.6 km from the crater. 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 29 May-5 June. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Suwanosejima | Ryukyu Islands (Japan) : JMA reported that nighttime incandescence at Suwanosejima’s Ontake Crater was occasionally visible during 29 May-5 June. An explosion at 0210 on 29 May produced an off-white plume that rose as high as 500 m above the crater rim. Large rocks were ejected 200 m above the rim. The Alert Level remained at 2 (on a 5-level scale).

Whakaari/White Island | North Island (New Zealand) : On 9 June GeoNet reported that a short-lived gas pulse and accompanying minor uplift in the vent area at Whakaari/White Island was recorded the previous week. The activity was likely linked to new magma emplaced at a shallow depth. High temperatures (around 450 degrees Celsius) at the vent area continued to be recorded. A decline in gas flux was recorded on 3 June, lower than the high levels detected on 28 May, suggesting that the increase was short-lived. Recent rainfall increased steam emissions and some water has ponded on the crater floor. The Volcanic Alert Level remained at 2 and the Aviation colour Code remained at Yellow.

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