Aira (Japan) | 20 May-26 May 2015 | Continuing ActivityCite this Report

JMA reported 19 explosions during 18-25 May from Showa Crater at Aira Caldera’s Sakurajima volcano, some that ejected tephra as far as 1,300 m, and incandescence from the crater was occasionally visible at night. During 21-22 May explosions generated ash plumes that rose 3-4.3 km above the crater. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Batu Tara (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 21-22 May ash plumes from Batu Tara rose to an altitude of 2.5 km (8,000 ft) a.s.l. and drifted over 80 km W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Colima (Mexico) | 20 May-26 May 2015 | Continuing ActivityCite this Report

Based on satellite images, the Washington VAAC reported that on 21 May an ash plume rose from Colima to an altitude below 4.9 km (16,000 ft) a.s.l. and drifted W.

Source: Washington Volcanic Ash Advisory Center (VAAC)

Dukono (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 17-19 May ash plumes from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 75 km NW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Fuego (Guatemala) | 20 May-26 May 2015 | Continuing ActivityCite this Report

INSIVUMEH reported that activity at Fuego remained high during 21-26 May. Explosions produced ash plumes that rose 800 m above the crater and drifted 8-10 km W and SW. Ash fell in nearby areas including Panimache I and II, Morelia, and Santa Sofía. Homes within a 10-km radius vibrated from explosions. Incandescent material was ejected 150-200 m above the crater and incandescent block avalanches descended the Cenizas (SSW) and Trinidad (S) ravines.

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

Karymsky (Russia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

KVERT reported that moderate activity at Karymsky likely continued during 15-22 May. Satellite images detected a thermal anomaly during 15-16 May and an ash plume drifting 27 km W on 16 May. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Kerinci (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that during 1 February-21 May 2015 white plumes from Kerinci rose 50-150 m and drifted E and W. Seismicity during 1-21 May was dominated by signals indicating emissions (100-110 per day on average) as well as volcanic earthquakes (1 per day on average). The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were advised not to enter an area within 3 km of the summit.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Krakatau (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that during 22 April-25 May diffuse white plumes rose 25 m above Anak Krakatau, although foggy weather often prevented observations. Seismicity was high during May, and continued to be dominated by shallow and deep volcanic earthquakes, and signals indicating emissions. The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were warned not to approach the volcano within 1 km of the crater.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Kuchinoerabujima (Japan) | 20 May-26 May 2015 | Continuing ActivityCite this Report

JMA reported that no eruptions occurred from Kuchinoerabujima during 18-22 May, although the level of activity remained elevated. White plumes rose 600 m above Shindake Crater, and incandescence from the W part of the crater was observed at night. Volcanic earthquakes were detected; tremor was absent. Fumarolic activity in a crack in W part of the crater was observed during a field survey. The Alert Level remained at 3 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Marapi (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that during February-25 May diffuse white plumes rose as high as 300 m above Marapi, although inclement weather often prevented observations. Seismicity fluctuated. The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were advised not to enter an area within 3 km of the summit.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Papandayan (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that during 22 April-25 May seismicity at Papandayan was dominated by shallow volcanic earthquakes but also consisted of volcanic earthquakes, low-frequency earthquakes, tremor, and local and remote tectonic earthquakes. Visual monitoring occurred from the Pakuwon Village post; observers noted white plumes rising at most 30 m above the crater. The Alert Level remained at 2 (on a scale of 1-4); residents and tourists were reminded not to approach the craters within a 1-km radius.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Popocatepetl (Mexico) | 20 May-26 May 2015 | Continuing ActivityCite this Report

CENAPRED reported that during 20-26 May the seismic network at Popocatépetl recorded 40-307 daily emissions consisting of water vapor, gas, and sometimes ash; cloud cover often prevented visual observations. Nighttime crater incandescence was noted every night; sometimes the incandescence would become more intense with accompanying emissions. A small explosion at 0023 on 21 May generated a plume with low ash content that rose 800 m and drifted SW. During 22-24 May ash plumes rose 0.5-2.5 km and drifted SW. Ashfall was reported in Ocuituco (24 km SW) on 22 May. From 1702 to 1955 on 25 May a series of explosions accompanied by tremor ejected steam, gas, and ash plumes that drifted SSE. Explosions were detected on 26 May; ashfall was rpeorted in Tetela del Volcán (20 km SW).The Alert Level remained at Yellow, Phase Two.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)

Raung (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that, during infrequent times of clear weather during 1 February-21 May, gray and gray-to-brown plumes were observed rising as high as 300 m above Raung's crater rim. Rumbling was frequently heard at the observation post. Crater incandescence was observed during February and on 12 April. Seismicity fluctuated and was dominated by tremor. The Alert Level remained at 2 (on a scale of 1-4); residents and tourists were reminded not to approach the craters within a 2-km radius.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Reventador (Ecuador) | 20 May-26 May 2015 | Continuing ActivityCite this Report

During 20-26 May IG reported moderate-to-high seismic activity including explosions, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover sometimes prevented visual observations. A lava flow on the SW flank advanced during 20-21 May. During 24-25 May ash plumes rose 600-800 m and drifted SW, although at 1730 on 25 May a water vapor plume with moderate ash content rose 1.5 km and drifted SW.

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

Santa Maria (Guatemala) | 20 May-26 May 2015 | Continuing ActivityCite this Report

INSIVUMEH reported that a moderate explosion at Caliente cone, part of Santa María's Santiaguito lava-dome complex, generated an ash plume that rose 600 m and drifted SW; ashfall was reported in La Florida and Monte Claro. During 23-24 May explosions produced ash plumes that rose 500 m and drifted SE and E. Ash fell in the Palajunoj area and Monte Claro. Small explosions and avalanches were detected during 24-26 May.

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

Sheveluch (Russia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

KVERT reported that during 15-22 May lava-dome extrusion onto Sheveluch’s N flank was accompanied by fumarolic activity. A thermal anomaly was detected in satellite images during 15-19 May. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Shishaldin (United States) | 20 May-26 May 2015 | Continuing ActivityCite this Report

AVO reported that seismicity at Shishaldin continued to be elevated over background levels 20-26 May indicating that low-level eruptive activity confined to the summit crater likely continued. Elevated surface temperatures were periodically detected in satellite images. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Sinabung (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that foggy weather often prevented visual observations of Sinabung during 19-25 May, except for a few clearer periods on some days. White plumes rose as high as 800 m during 19-20 and 22-24 May. Lava from the lava dome was active as far as 1.5 km S during 21-23 May. On 24 May a pyroclastic flow traveled 2 km down the S flank and produced an ash plume that rose 500 m. Seismicity consisted of avalanche signals, low-frequency and hybrid events, tectonic events, and volcanic earthquakes; RSAM values increased due to an increase of avalanche signals. The Alert Level remained at 3 (on a scale of 1-4). Visitors and tourists were prohibited from approaching the crater within a radius of 6 km on the S, 5 km on the SE flanks, and 3 km in the other directions.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Slamet (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that during 21 April-21 May dense white plumes rose as high as 700 m above Slamet's crater. Seismicity consisted of emission signals and tremor; RSAM values fluctuated. The Alert Level remained at 2 (on a scale of 1-4). Residents and tourists were warned to not approach the crater within a radius of 2 km.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Tengger Caldera (Indonesia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

PVMBG reported that during 1 April-25 May white plumes from Tengger Caldera's Bromo cone rose 50 m above the crater. A sulfur dioxide odor was noted at the Bromo observation post. Seismicity was dominated by tremor, but also included volcanic earthquakes. The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were warned not to approach the crater within a radius of 1 km.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Ubinas (Peru) | 20 May-26 May 2015 | Continuing ActivityCite this Report

Instituto Geofísico del Perú (IGP) Observatorio Volcanológico del Sur (OVS) reported that during 19-26 May long-period earthquakes continued at the same rate while volcano-tectonic and hybrid events increased. Overall the dominant signal was spasmodic tremor associated with ash-and-steam emissions. While conducting fieldwork during 19-22 May, OVS staff observed persistent water vapor, gas, and ash emissions that rose 400 m. At 1051 and 1213 on 24 May ash plumes rose as high as 1.2 km and drifted NE and E.

Source: Instituto Geofísico del Perú (IGP)

Villarrica (Chile) | 20 May-26 May 2015 | Continuing ActivityCite this Report

OVDAS-SERNAGEOMIN reported no significant changes at Villarrica during 20-26 May. Seismicity had significantly decreased, although the data continued to indicate small explosions and degassing from the lava lake. Deformation data suggested inflation during 24-26 May. The Alert Level remained at Orange (the second highest level on a four-color scale) and the public was warned to stay outside of a 5-km radius around the crater and away from drainages.

Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI)

Zhupanovsky (Russia) | 20 May-26 May 2015 | Continuing ActivityCite this Report

On 16 May KVERT reported that the explosive eruption that began at Zhupanovsky on 6 June 2014 ended at the beginning of April 2015. The last ash plume occurred on 3 April, although weak thermal anomalies continued to be detected. The Aviation Color Code was lowered to Yellow. On 20 May an ash plume drifted 470 km E.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)