Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the Week 8 April 2020 – 14 April 2020

Aira | Kyushu (Japan) : JMA reported that during 6-13 April incandescence from Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was visible nightly. The seismic network recorded 16 eruptive events and 6 explosions. Ash plumes rose as high as 2 km above the crater rim and material was ejected 300-500 m away from the crater. The Alert Level remained at 3 (on a 5-level scale).

Dukono | Halmahera (Indonesia) : Based on satellite and wind model data, the Darwin VAAC reported that during 8-14 April ash plumes from Dukono rose to 2.1-3 km (7,000-10,000 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 4-5 and 9 April that sent ash plumes up to 1.5 km (4,900 ft) a.s.l. Ash plumes drifted NE. A thermal anomaly was visible in satellite images on 5 April. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Fuego | Guatemala : In a special report from 6 April INSIVUMEH reported a change in the eruptive pattern at Fuego indicated by seismic and acoustic data. Lava effused from a summit vent and traveled 400 m down the Ceniza (SSW) drainage. Avalanches of material descended the flank as far as 1 km, reaching vegetated areas. Explosions caused rumbling, shock waves, and ash plumes that rose 1.1 km above the summit. The report noted that this activity was similar to the eight-day phase during 16-24 March. There were 5-14 explosions per hour recorded during 7-14 April, generating ash plumes that rose as high as 1.1 km above the crater rim and generally drifted 10-20 km in multiple directions. Minor ashfall was reported in several areas downwind including Santa Sofía (12 km SW), Morelia (9 km SW), Panimaché I and II (8 km SW), Quisache, and Sangre de Cristo (8 km WSW). Explosions sometimes produced shock waves that rattled houses in communities within a 25-km radius. Incandescent material was ejected 100-600 m high. Lava flows in the Ceniza drainage had variable lengths during the week, from 200 to 600 m long. Avalanches of blocks from the lava flows traveled sometimes long distances, and in some cases set fire to vegetated areas.

Ibu | Halmahera (Indonesia) : The Darwin VAAC reported that during 8-10 and 13 April ash plumes from Ibu rose 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted N, SE, and S based on satellite images and weather models. 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 was visible during 3-10 April along with a bright thermal anomaly identified in satellite images. Vulcanian activity was visible during 6-9 April; ash plumes drifted 200 km S, SE, and E at altitudes of 5.5-6 km (18,000-19,700 ft) a.s.l. on those same days. The Aviation colour Code remained at Orange.

Mayon | Luzon (Philippines) : PHIVOLCS reported that during 7-14 April white steam plumes periodically emitted from Mayon rose as high as 400 m above the summit and drifted mainly NW, W, and SW. Crater incandescence was visible nightly. The Alert Level remained at 2 (on a 0-5 scale) and PHIVOLCS reminded residents to stay away from the 6-km-radius Permanent Danger Zone and the 7-km Extended Danger Zone on the SSW and ENE flanks.

Merapi | Central Java (Indonesia) : PVMBG reported that an eruption at Merapi began at 0910 on 10 April and lasted for one minute and 43 seconds. A gray ash plume rose as high as 3 km above the summit and drifted NW. The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to stay outside of the 3-km exclusion zone.

Rincon de la Vieja | Costa Rica : OVSICORI-UNA reported periodic hydrothermal explosions at Rincón de la Vieja during 8-14 April. A possible small eruption occurred at 0658 on 8 April and was followed by a decrease in the amplitude of tremor signals. Beginning at 0033 on 11 April a small-scale hydrothermal explosion was recorded by the infrasoiund and seismic networks for 20 seconds. Water and sediment was ejected onto the upper flanks of the volcano. The event was recorded by the webcam located in Sensoria, 4 km N of the crater. In the morning local residents noted that the water in the Pénjamo River was milky white. A small hydrothermal explosion at 0251 on 13 April produced a plume of steam and gas that rose 500 m.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 3-10 April. Explosions on 8 April generated ash plumes that rose to 10 km (32,800 ft) a.s.l. and drifted 526 km SE during 8-9 April. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Suwanosejima | Ryukyu Islands (Japan) : JMA reported that during 3-10 April incandescence from Suwanosejima’s Ontake Crater was visible nightly. Small eruptions occasionally occurred, producing gray-white plumes that rose as high as 900 m above the crater rim; rumbling sounds were noted in a village 4 km SSW. The Alert Level remained at 2 (on a 5-level scale).

Taal | Luzon (Philippines) : PHIVOLCS reported that during 8-9 April steam plumes rose 100-300 m above the Taal’s main vent and drifted SW. Weak steaming (plumes up to 20 m high) from ground cracks was visible during 8-14 April along the Daang Kastila trail which connects the N part of Volcano Island to the N part of the main crater. PHIVOLCS had lowered the Alert Level to 1 (on a scale of 0-5) on 19 March and recommended no entry onto Volcano Island, the area defined as the Permanent Danger Zone.

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