CLEVELAND Chuginadak Island 52.825°N, 169.944°W; summit elev. 1730 mAVO reported that a small explosion from Cleveland was detected at 0112 on 4 April by distant seismic stations and infrasound arrays. Weather conditions prevented the detection of a possible eruption cloud in satellite images or by visual observation of the summit. Observations the next day revealed a thermal anomaly and that the 70-m-diameter lava dome had been destroyed by the explosion. This was the third lava dome that was erupted and subsequently destroyed by explosive events since the eruption began in July 2011. On 6 April two short-duration explosions occurred at about 1635 and 2126. The resulting eruption clouds were ash poor and did not rise above 3 km (10,000 ft) a.s.l. Elevated surface temperatures were observed using infrared satellite images near the times of the explosions. Satellite observations were obscured by clouds during 8-10 April. No seismic information was available because Cleveland does not have a real-time seismic network. Map.
FUEGO Guatemala 14.473°N, 90.880°W; summit elev. 3763 mINSIVUMEH reported that during 9-10 April explosions from Fuego produced ash plumes that rose 100-900 m above the crater and drifted 10-15 km E and SE. Explosions produced shock waves detected within 8 km of the volcano. Avalanches descended the flanks. Map.
NEVADO DEL RUIZ Colombia 4.895°N, 75.322°W; summit elev. 5321 mAccording to INGEOMINAS, the Observatorio Vulcanológico and Sismológico de Manizales reported that during 4-10 April seismicity at Nevado del Ruiz fluctuated but remained elevated. Sulfur dioxide emissions also remained high; occasionally a sulfur odor was reported in Manizales, about 25 km NW. On 5 April a volcano-tectonic earthquake, M 2.8, occurred below Arenas crater at a depth of 1 km, and was the highest magnitude earthquake recorded since February. During 4-6 April gas-and-steam plumes drifted NW. Gas-and-steam plumes rose 3 km above the crater on 7 April and 1.5 km above the crater on 10 April; the plumes drifted SE both days. The Alert Level remained at II (Orange; "eruption likely within days or weeks"). Map.
SOUFRIERE HILLS Montserrat 16.72°N, 62.18°W; summit elev. 915 mMVO reported that during 30 March-6 April activity at the Soufrière Hills lava dome was generally at a low level and no ash-venting episodes had been detected since 23 March. The average sulfur dioxide emission rate measured during the week was 529 tonnes per day with a minimum of 200 and a maximum of 1,033. Scientists aboard a helicopter overflight on 4 April observed a new vent which had formed on 23 March; it was 30-50 m across and on the W side of the crater floor. The Hazard Level remained at 2. Map.
For the complete list of ongoing volcanic activity and additional geological summary, click HERE or select the specific volcano name below for additional details:
ONGOING ACTIVITY: Karymsky, Eastern Kamchatka (Russia) | Kilauea, Hawaii (USA) | Pagan, Mariana Islands | Puyehue-Cordón Caulle, Central Chile | Ranakah, Flores Island (Indonesia) | Santa María, Guatemala | Shiveluch, Central Kamchatka (Russia) | Tambora, Sumbawa Island (Indonesia) | Tungurahua, Ecuador