The Wellington VAAC reported that on 3 April pilots observed lava and ash emissions from Ambrym. Ash plumes rose to altitudes below 2.4 km (8,000 ft) a.s.l.

Source: Wellington Volcanic Ash Advisory Center (VAAC)

Based on satellite imagery and CVGHM, the Darwin VAAC reported that during 29 March-3 April semi-continuous emissions from Batu Tara produced diffuse plumes. The plumes rose to altitudes of 1.5-3 km (5,000-10,000 ft) a.s.l. and drifted E and N.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

On 28 March, observers reported roaring noises and an ash column from Reventador that rose to an altitude of 5.6 km (18,400 ft) a.s.l. and drifted W. A small lava flow traveled 200 m down the S flank. Incandescent material and ash emissions were observed during 29-31 March. On 1 April, ash plumes rose to an altitude of 7.6 km (24,900 ft) a.s.l. and incandescent rocks were ejected about 50 m above the crater. Incandescent material was again seen at the summit on 2 April. The Washington VAAC reported that a strong hotspot was present on satellite imagery during 1-3 April. Based on pilot reports, IG reported that a steam-and-gas plume with little ash content rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted W on 3 April.

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)

According to a news article, a volcano observer monitoring Slamet reported on 1 April that plume activity had increased in intensity and frequency over the previous two weeks. Plumes rose to an estimated altitude of 3.8 km (12,500 ft) a.s.l.

Source: Earth Times

IG reported that on 27 March, at 1716, an ash column from Tungurahua rose to an altitude of 11 km (36,000 ft) a.s.l. An accompanying pyroclastic flow traveled 1 km down the Mandur gorge on the NW flank. A lahar traveled W down the Bilbao gorge and vibrated near-by structures. On 28 March, ash plumes again rose to altitudes of 11 km (36,000 ft) a.s.l. Ashfall was reported from areas downwind. Noises that resembled rolling blocks down the flanks were reported. Hot steaming mudflows traveled N, NW, and W. On 29 March, three explosions rattled windows in areas as far away as 8 km. During 30 March-3 April, ash plumes, occasionally accompanied by roaring noises and "cannon shots," rose to altitudes of 6-10.5 km (19,700-34,400 ft) a.s.l. and drifted mainly W and NW. Incandescent material was ejected 300 m above the crater and subsequently descended about 1 m down the flank on 31 March; similar activity was observed at the summit during 1-2 April. Ashfall was reported from areas about 8 km SW, N, and W.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

According to a news article, eruption plumes from Karangetang rose to an altitude of 1.9 km (6,000 ft) a.s.l. on 27 March. Pyroclastic flows may have occurred the next day.

Source: The Jakarta Post

Based on satellite imagery and information from the Petropavlovsk-Kamchatsky Flight Information Region (FIR), the Tokyo VAAC reported that an eruption plume from Karymsky rose to an altitude of 3 km (10,000 ft) a.s.l. on 31 March.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)

During 28 March-3 April, lava from Kīlauea continued to flow across a lava delta into the ocean at the Kamokuna entry. Lava was not seen entering the ocean at the East Laeʻapuki entry. During 28-29 March, a more than usual number of earthquakes were located near the Halemaʻumaʻu and Koko'olau craters and on the S flank. Incandescence was intermittently visible from several breakouts on the Pūlama pali and from several vents in Puʻu ʻŌʻō's crater. On 31 March, a major lava breakout from the Campout flow caused trees to ignite on a near-by kipuka (an "island" of vegetation) and produced small explosions from trapped gas.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Based on observation and video data, lava from Kliuchevskoi flowed down the NW flank on 29 March. On 31 March, lava bombs from Strombolian activity were projected about 100-200 m above the crater. According to a news article, lava flows are interacting with snow and ice and producing vapor plumes.

Sources: RIA Novosti, Kamchatkan Volcanic Eruption Response Team (KVERT)

OVPDLF reported that on 2 April lava fountains about 50 m high erupted from a fissure at Piton de la Fournaise. The NW-SE-trending fissure was located SW of Dolomieu crater and was about 1 km long.

Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)

Based on information from the Mexico City MWO, the Washington VAAC reported that an ash plume from Popocatépetl rose to an altitude of 7.6 km (25,000 ft) a.s.l. and drifted NE on 1 April.

Source: Washington Volcanic Ash Advisory Center (VAAC)

RVO reported that during 26 March-1 April, Rabaul caldera's Tavurvur cone emitted steam and steam-and-ash plumes that rose to 0.8 km (2,600 ft) a.s.l. and drifted E, N, and NW. Roaring noises occasionally accompanied emissions. Incandescent material was ejected to at most 100 m above the lowest part of the vent during 26-30 March. Based on reports from RVO and satellite imagery, the Darwin VAAC reported that ash plumes rose to altitudes of 1.5-3 km (5,000-10,000 ft) a.s.l. and drifted NE during 1-2 April.

Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)

INSIVUMEH reported that explosions from Santa María's Santiaguito lava dome complex produced ash plumes that rose to an altitude of 5 km (16,400 ft) a.s.l. on 29 March. Ashfall was reported near the Observatory Vulcanológico de Santiaguito (OVSAN), about 5 km S. On 30 March, the Washington VAAC reported that diffuse ash plumes were visible on satellite imagery drifting SW. On 2 April, INSIVUMEH reported that ash plumes rose to 4.4 km (14,400 ft) a.s.l. and drifted SW.

Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

An explosive event at Shiveluch on 29 March produced an ash plume that rose to an estimated altitude of 9.8 km (32,000 ft) a.s.l. and drifted NE. Based on reports from the Yelizovo Meteorological Watch Office and satellite imagery, the Tokyo VAAC reported that the plume reached an altitude of 11.9 km (39,000 ft) a.s.l. The next day, an explosive event that lasted about 6 minutes produced a plume to altitudes of 10.1-12.2 km (33,000-40,000 ft) a.s.l., based on estimates from AVO, Tokyo VAAC, and the Kamchatkan Branch of Geophysical Services. The plume drifted NE.

According to a news article, a mudflow covered an approximately 900-m-long section of road, about 20 km from Shiveluch on 31 March.

Sources: US Geological Survey Alaska Volcano Observatory (AVO), Itar-Tass News

During 23 March-3 April, lava-dome growth at Soufrière Hills was reduced or possibly paused. Small, intermittent pyroclastic flows occurred in the Tar River Valley. Fumarolic activity was observed around the region of a collapse scar at the head of Tyres Ghaut and was audible during 28-29 March. The Washington VAAC reported that a SW-drifting, diffuse plume and a hotspot were visible on satellite imagery on 2 April.

Source: Montserrat Volcano Observatory (MVO)

Data from deformation-monitoring instruments and observations from a remote camera showed that during 28 March-3 April, lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5 and occasionally larger earthquakes. On 3 April, a GPS unit on an active spine showed W-ward movement at a rate of about 30 cm/day.

Source: US Geological Survey Cascades Volcano Observatory (CVO)

Based on information from JMA, the Tokyo VAAC reported explosions from Suwanose-jima on 30 March and 2 April. Ash was not visible on satellite imagery.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)

Based on pilot reports, the Buenos Aires VAAC reported that an ash cloud from Ubinas rose to 5.5-6.1 km (18,000-20,000 ft) a.s.l. on 30 March and drifted E. According to a news article, local residents observed rockfalls and reported ashfall. A scientist from the Geological, Mining, and Metallurgic Institute (INGEMMET) reported that the eruption was the largest in a two-week period characterized by an increased rate of explosions. A diffuse ash plume was visible on satellite imagery on 3 April drifting NE.

Sources: Buenos Aires Volcanic Ash Advisory Center (VAAC), Living in Peru