KVERT reported on 1 June that the Level of Concern Color Code for Kliuchevskoi was lowered from Red to Orange. During 25 May-1 June, seismic activity continued above background levels and a thermal anomaly in the crater was detected on satellite imagery. According to video data and visual observations on 27 and 31 May, there was Strombolian and Vulcanian activity at the summit crater, lava flows, and phreatic bursts on the NW flank from where lava interacted with ice. Ash plumes rose to altitudes of 5-7 km (16,000-26,200 ft) a.s.l. during 29-31 May and drifted in multiple directions. Strong phreatic bursts were seen from the front of a new lava flow from on the E flank on 31 May.

Based on information from KVERT, the Tokyo VAAC reported that ash emissions produced plumes on 2 and 5 June to an altitude of about 5.8 km (19,000 ft) a.s.l. Ash was not identified on satellite imagery. During 3-4 June, ash plumes to altitudes of 5.2-7 km (17,000-23,000 ft) a.s.l. were possibly identified on satellite imagery.

Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)

Based on a Significant Meteorological Information (SIGMET) advisory and information from the Puerto Montt Flight Information Region (FIR), the Buenos Aires VAAC reported that an ash plume from Llaima rose to an altitude of 3 km (10,000 ft) a.s.l. on 29 May. The plume drifted E. Ash was not identified on satellite imagery.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)

Based on information from JMA, the Tokyo VAAC reported that ash plumes from Sakura-jima rose straight up to altitudes of 2.1-2.4 km (7,000-8,000 ft) a.s.l. during 31 May-1 June. During 4-5 June, plumes again rose to the same altitudes as during 31 May-1 June and drifted W, NW, and E. Ash was not detected on satellite imagery.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)

Based on observations of satellite imagery, the Washington VAAC reported that diffuse ash plumes from Colima drifted SW and S on 31 May.

Source: Washington Volcanic Ash Advisory Center (VAAC)

Seismic activity at Karymsky was slightly above background levels during 25 May-1 June. Visual observations were not possible due to cloud cover. The Level of Concern Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

During 30 May-5 June, lava from Kīlauea flowed SE across a growing lava delta into the ocean at the Poupou entry. By 24 May, lava no longer entered the ocean at the Kamokuna entry. Incandescence was visible from several vents in the Puʻu ʻŌʻō crater and from breakouts above the Pūlama pali fault scarp. The earthquake swarm that began on 12 May continued S of Halemaʻumaʻu and in the upper E rift zone. On 18 May, a large lava flow broke out of the PKK lava tube at the site of an old skylight named Petunia. By 4 June, the Petunia flow advanced 2 km. Also on 4 June, a M 3.8 earthquake occurred about 4 km NE of Pāhala town. Surface flow activity was seen on the E flow-field between Royal Gardens subdivision and the coast.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

RVO reported that the emission of ash clouds from Langila's Crater 2 continued during 22 May-1 June and were occasionally accompanied by roaring noises. Two large explosions on 30 May produced ash plumes that rose to an altitude of 5.3 km (17,400 ft) a.s.l. and drifted NW. Ash plumes rose to altitudes of 3.3-4.3 km (10,800-14,100 ft) a.s.l. and drifted NW during 22 May-1 June. Ashfall was reported from Kilenge Catholic Mission (about 10 km NW of the volcano) and surrounding areas during the last few days of May and 1 June. Incandescence was visible on 29 and 31 May. Crater 3 was quiet. Based on observations of satellite imagery and information from RVO, the Darwin VAAC reported that an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. on 3 June and drifted W.

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

Based on satellite image observations and information from RVO, the Darwin VAAC reported that diffuse plumes from Manam rose to an altitude of 3 km (10,000 ft) a.s.l. on 5 June and drifted WNW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Based on seismic interpretation, INGEOMINAS reported ash emissions from Nevado del Huila during 27 May that were confirmed later that day by aerial observations. Tremor on 28 May possibly indicated another pulse of ash emissions. Sulfur-dioxide flux measured 3,000 metric tons per day on 1 June and about 6,900 metric tons per day on 2 June.

Source: Servicio Geológico Colombiano (SGC)

INSIVUMEH reported that on 31 May, and 1 and 5 June, lava from the NE flank of Pacaya's MacKenney Cone continued to flow and pooled between the base of the volcano and the plateau. Gas plumes from the summit drifted N and SW and rose to altitudes of 2.8 km (9,200 ft) a.s.l. on 5 June. Small pyroclastic explosions from the N part of MacKenney Cone were occasionally observed.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

KVERT reported that seismic activity at Shiveluch continued above background levels during 25 May-1 June. Based on seismic interpretation, ash plumes possibly rose to an altitude of 9.5 km (31,200 ft) a.s.l. throughout the reporting period. According to visual observation and video data, gas-and-steam and ash plumes rose to altitudes of 5-6 km (16,400-19,700 ft) a.s.l. during 27-28 and 30-31 May. Plumes were seen on satellite imagery drifting SW during 27-28 May. A large thermal anomaly was also visible on satellite imagery. The Tokyo VAAC reported that based on reports from KEMSD, an eruption plume rose to an altitude of 6.4 km (21,000 ft) a.s.l. on 2 June. The Level of Concern Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

MVO reported that during 25 May-1 June the lava dome at Soufrière Hills changed very little based on visual observations and seismic activity was very low. Low-level rockfall and pyroclastic flow activity continued. On 31 May, pyroclastic flows traveled approximately 1 km E in the Tar River Valley. The Alert Level remained at 4 (on a scale of 0-5).

Source: Montserrat Volcano Observatory (MVO)

Data from deformation-monitoring instruments indicated that during 30 May-5 June lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. In general, gas and steam plumes from the active lava dome, as well as dust plumes resulting from rockfalls, occasionally rise above the crater rim; a gas plume may have been visible on 3 June. In some instances, clouds inhibited visual observations.

Source: US Geological Survey Cascades Volcano Observatory (CVO)

During 30 May-5 June, IG reported that ash plumes intermittently visible from Tungurahua rose to altitudes of 6-7 km (19,700-23,000 ft) a.s.l. and drifted mainly SW, W, and NW. Ashfall was reported from areas downwind between 30 May and 3 June. Muddy waters traveled down W, SW, and NW drainages during 30 May-1 June. Lahars were reported from the Choglontus drainage to the WSW on 30 May and from the Motilones drainage to the WNW on 1 June. During 4-5 June, roaring noises were reported.

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

Based on observations from satellite imagery and Significant Meteorological Information (SIGMET) advisories, the Buenos Aires VAAC reported that during 30 May-3 June and on 6 June ash plumes from Ubinas rose to altitudes of 3.7-7.6 km (12,000-25,000 ft) a.s.l. Plumes drifted NE, ESE, and SSE.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)