Volcanos

Global Volcanic Activity – Ongoing Activity for the week of 10 April – 16 April 2019

Agung | Bali (Indonesia) : PVMBG reported that at 1847 on 11 April an explosion at Agung produced a dense gray ash plume that rose 2 km above the crater rim and drifted W. The Alert Level remained at 3 (on a scale of 1-4) with the exclusion zone set at a 4-km radius.

Aira | Kyushu (Japan) : JMA reported that incandescence from Minamidake crater (at Aira Caldera’s Sakurajima volcano) was occasionally visible during 12-15 April. Two events and one explosion generated plumes that rose a maximum of 2.2 km above the crater rim and ejected material as far as 700 m. 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 10-12 and 15-16 April ash plumes from Dukono rose as high as 2.4 km (8,000 ft) a.s.l. and drifted in multiple directions. The Alert Level remained at 2 (on a scale of 1-4), and visitors were 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 on 9 April that sent ash plumes up to 2.2 km (7,200 ft) a.s.l. Weather clouds obscured views on the other days during 5-12 April. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Etna | Sicily (Italy) : INGV reported that during 8-14 April gas emissions of variable intensity rose from Etna’s summit craters. During each night webcams recorded pulsating flashes from the E vent in New Southeast Crater (NSEC) which became more intense towards the end of the week. A minor ash emission from Bocca Nuova Crater was visible at 0520 on 8 April.

Fuego | Guatemala : INSIVUMEH reported that during 10-11 April steaming lahars descended Fuego’s Las Lajas (SE), El Jute (SE), Ceniza (SSW), and Taniluyá (SW) drainages, carrying blocks up to 3 m in diameter, and branches and tree trunks. On 11 April lahars were 3 m deep and 20 m wide. During 11-15 April there were 12-22 explosions per hour, generating ash plumes that rose almost 1.1 km and drifted10-15 km N, NE, E, and W. Minor ashfall was reported in areas downwind including Alotenango, Ciudad Vieja (13.5 km NE), La Réunion, Yepocapa (8 km N), Morelia (9 km SW), Santa Sofia (12 km SW), and Panimache (8 km SW). Shock waves sometimes vibrated residential structures. Incandescent material was ejected 100-300 m high and caused avalanches of material that occasionally traveled long distances down Seca, Taniluyá, Ceniza, Trinidad, Las Lajas, and Honda ravines. A lava flow, 400-500 m long, advanced in the Seca drainage.

Ibu | Halmahera (Indonesia) : The Darwin VAAC reported that on 10 April ash plumes from Ibu were identified in satellite images drifting N at an altitude of 2.1 km (7,000 ft) a.s.l. During 15-16 April ash plumes drifted N and NE at an altitude of 2.4 km (8,000 ft) a.s.l. 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.

Kadovar | Papua New Guinea : Based on satellite data and wind model data, the Darwin VAAC reported that on 10 April an ash plume from Kadovar rose to an altitude of 1.2 km (4,000 ft) a.s.l. and drifted SE and E.

Karangetang | Siau Island (Indonesia) : Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 16 April an ash emission from Karangetang rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted W. The Alert Level remained at 2 (on a scale of 1-4).

Kerinci | Indonesia : PVMBG reported that at 1559 on 13 April and 0629 on 14 April brownish ash plumes rose 400 m above Kerinci’s crater rim and drifted E and NE, respectively, as noted by a ground-based observer. The Alert Level remained at 2 (on a scale of 1-4), and tourists were warned to remain outside of the 3-km exclusion zone.

Krakatau | Indonesia : PVMBG reported that an eruption at Anak Krakatau was recorded by the seismic network at 0932 on14 April. An ash plume drifted NE. An event was recorded at 2358 on 15 April, though no ash plume was visible. The Alert Level remained at 3 (on a scale of 1-4), and residents were warned to remain outside of the 5-km radius hazard zone from the crater.

Merapi | Central Java (Indonesia) : PVMBG reported that during 5-11 April the lava dome at Merapi continued to grow slowly, with extruded material channeled into the SE-flank Gendol River drainage. The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to remain outside of the 3-km exclusion zone.

Rincon de la Vieja | Costa Rica : OVSICORI-UNA reported that an eruption at Rincón de la Vieja recorded at 0617 on 10 April produced a gas-and-steam plume that rose 1 km above the crater rim and drifted SE. At 0643 on 12 April a plume rose 500 m. Another event was detected at 0700 on 13 April, although poor weather conditions prevented visual observations. On 14 April OVSICORI-UNA noted that aerial photographs taken during an overflight showed a milky-gray acid lake at a relatively low water level with convection cells of several tens meters of diameter in the center and Eastern parts of the lake.

Ruapehu | North Island (New Zealand) : GeoNet reported that, at least for the last 10 years of continuous lake-temperature monitoring, heating cycles at Ruapehu’s summit Crater Lake have occurred over periods of about 12 months with temperatures ranging from 15 to 45 degrees Celsius. However, the temperature remained elevated at 30 degrees for a period of six months starting in September 2018. GeoNet noted that during the previous two weeks the lake temperature increased further, at a rate of around a half of a degree per day, to 42 degrees on 9 April. Tremor levels also increased. The Volcanic Alert Level remained at 1 (minor volcanic unrest) and the Aviation colour Code remained at Green.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that a thermal anomaly over Sheveluch’s lava dome was identified daily in satellite images during 6-12 April. Explosions on 10 April generated ash plumes that rose to 8-9 km (26,200-29,500 ft) a.s.l. and drifted about 1,300 km SSE. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

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