Smithsonian / USGS Weekly Volcanic Activity Report

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 20 August-26 August 2014
Name	Location	Eruption Start Date	Report Status
Bardarbunga	Iceland	—	New
Aira	Kyushu (Japan)	2017 Mar 25	Continuing
Bagana	Bougainville (Papua New Guinea)	2000 Feb 28 (in or before)	Continuing
Batu Tara	Komba Island	—	Continuing
Dukono	Halmahera	1933 Aug 13	Continuing
Fuego	South-Central Guatemala	2002 Jan 4	Continuing
Kilauea	Hawaiian Islands (USA)	—	Continuing
Kuchinoerabujima	Ryukyu Islands (Japan)	—	Continuing
Kusatsu-Shiranesan	Honshu (Japan)	—	Continuing
Mayon	Luzon (Philippines)	2023 Apr 27 ± 2 days	Continuing
Pacaya	South-Central Guatemala	—	Continuing
Popocatepetl	Mexico	2005 Jan 9	Continuing
Reventador	Ecuador	2008 Jul 27	Continuing
Sabancaya	Peru	2016 Nov 6	Continuing
San Miguel	Eastern El Salvador	—	Continuing
Santa Maria	Southwestern Guatemala	1922 Jun 22	Continuing
Sheveluch	Central Kamchatka (Russia)	1999 Aug 15	Continuing
Shishaldin	Fox Islands (USA)	2023 Jul 12	Continuing
Tungurahua	Ecuador	—	Continuing
Ubinas	Peru	—	Continuing
Zhupanovsky	Eastern Kamchatka (Russia)	—	Continuing

All times are local unless otherwise stated.

Bardarbunga | 20 August-26 August 2014 | New Activity / Unrest Cite this Report

Bardarbunga
Iceland

During 20-26 August the Icelandic Met Office reported ongoing high rates of seismic activity at Bárdarbunga volcano. Global Postioning System and seismic data indicated that an intrusive dike had increased from 25 to 40 km in length E, NE, and N of the volcano over the past week. During 22-26 August several earthquakes in the 4.7-5.7 magnitude range had been detected at or near the volcano. On 23 August seismic tremor indicated a small lava-eruption 150-400 m beneath the Dyngjujökull glacier, prompting a change in the Aviation Color Code to Red. On 24 August observations from an overflight indicated there was no eruption and the Aviation Color Code was changed to Orange. On 26 August the location of the seismicity was located primarily along the 10 km long tip of the dike that extended 5 km beyond the glacier margin.

Source: Icelandic Meteorological Office (IMO)

Aira | 20 August-26 August 2014 | Continuing ActivityCite this Report

Aira
Kyushu (Japan)

During 20-26 August JMA reported 17 explosions from Showa Crater at Aira Caldera’s Sakurajima volcano that were accompanied by volcanic earthquakes and volcanic tremor, and which ejected ballistics 500-800 m away. On 20-24 August clear incandescence was visible using high-sensitivity camera at night. On 20-26 August the Tokyo VAAC reported explosions with plumes that rose to an altitude of 1.2-2.7 km (4,000-9,000 ft) a.s.l. and drifted NE and N, though volcanic ash could not be identified in satellite data. The Alert Level remained at 3 (on a scale of 1-5).

Sources: Japan Meteorological Agency (JMA), Japan Meteorological Agency (JMA)

Bagana | 20 August-26 August 2014 | Continuing ActivityCite this Report

Bagana
Bougainville (Papua New Guinea)

During 25-26 August the Darwin VAAC reported ash plumes at Bagana that rose 2.1-2.4 km (7,000-8,000 ft) a.s.l. and drifted 65-120 km W and WNW. The Aviation Color Code remained at Orange.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Batu Tara | 20 August-26 August 2014 | Continuing ActivityCite this Report

Batu Tara
Komba Island

Based on analyses of satellite data, the Darwin VAAC reported an ash plume from Batu Tara on 26 June that drifted 35-55 km NW and W. The Aviation Color Code remained at Orange.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Dukono | 20 August-26 August 2014 | Continuing ActivityCite this Report

Dukono
Halmahera

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 20-21 August a low-level plume from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 37 km NW and N.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Fuego | 20 August-26 August 2014 | Continuing ActivityCite this Report

Fuego
South-Central Guatemala

During 20-26 August, INSIVUMEH reported that weak to moderate explosions at Fuego expelled blocks up to 800 m above the rim. On most days white plumes rose 200-600 m above the crater and drifted SW and W and on 25 August the white plume rose to 4.2 km (13,800 ft) above the crater. Ash plumes rose 4.1-4.6 km (13,500-15,100 ft) a.s.l. and drifted 10-15 km NE, W, S and SW. Ashfall was reported in villages Morelia (9 km SW), Panimaché (8 km SW), Panimaché II, Sangre de Cristo (8 km WSW), and Hagia Sophia. On most days rumbling was heard around the volcano and rattled structures near the volcano on 24 August. On 21 and 25 August were jet engine like sounds lasting 1-4 minutes. Weak to moderate avalanches of blocks were channeled into the canyons Las Lajas (SE), Trinidad (S), Ceniza (SSW), Taniluyá (SW), Santa Teresa and Honda.

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

Kilauea | 20 August-26 August 2014 | Continuing ActivityCite this Report

Kilauea
Hawaiian Islands (USA)

During 20-26 August HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Gas emissions remained elevated. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas; smaller particles may have been dropped several kilometers away. On 23 August part of the deep inner ledge surrounding the lava lake collapsed, disrupting the lava lake surface for a short time.

During 20-26 August glow was visible overnight above several outgassing openings in Pu`u `O`o's crater floor and on 20-21 August glow was visible at skylights along the June 27th flow lava tube. On 22 August observations during a helicopter flight showed the June 27th flow had poured into a deep, large crack of Kilauea’s east rift zone and produced a line of steaming that advanced eastward. On 25 August an overflight confirmed that lava in the crack had returned to the surface, creating a small, isolated pad of lava. On 26 August the farthest portion of this new pad of lava was about 11.4 km from the vent on Pu`u `O`o and about 3.1 km from the eastern boundary of the Wao Kele o Puna Forest Reserve. A separate branch of the June 27th flow continued to advance into a different section of forest northeast of Pu`u `O`o and was 7.3 km from the vent on 25 August.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Kuchinoerabujima | 20 August-26 August 2014 | Continuing ActivityCite this Report

Kuchinoerabujima
Ryukyu Islands (Japan)

JMA reported that during 20-26 August there were few episodes of volcanic tremor and volcanic earthquakes, with no explosions at Kuchinoerabujima. On most days a white plume rose 20-400m above the crater rim. The Alert Level for Kuchinoerabujima remained at 3 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Kusatsu-Shiranesan | 20 August-26 August 2014 | Continuing ActivityCite this Report

Kusatsu-Shiranesan
Honshu (Japan)

On 20-22 August JMA reported volcanic earthquakes continuing at Kusatsu-Shiranesan’s crater, although decreased from early August and tremor was absent. The Alert Level remains at 2 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Mayon | 20 August-26 August 2014 | Continuing ActivityCite this Report

Mayon
Luzon (Philippines)

During 20-26 August PHIVOLCS reported no incandescence at Mayon, despite the emergence of a summit dome, slight ground deformation, and increased volcanic gas emission. On most days seismic instruments recorded a few rock falls and sparse earthquakes. During 20-25 August observers noted moderate emission of white steam plumes that drifted SW, WSW, NE, ENE, and SSW. The Alert Level remained at 2 (on a scale of 0-5).

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Pacaya | 20 August-26 August 2014 | Continuing ActivityCite this Report

Pacaya
South-Central Guatemala

INSIVUMEH reported that during 20-26 August white and blueish white fumarolic plumes rose 50-150 m above Mackenney Crater at Pacaya and drifted 500-800 m S and SW. On 25 August small bursts of gray ash rose 300-700 m above the crater and drifted S.

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

Popocatepetl | 20 August-26 August 2014 | Continuing ActivityCite this Report

Popocatepetl
Mexico

CENAPRED reported that during 20-26 August steam-and-gas emissions with minor ash rose 100-800 m above Popocatépetl’s crater and drifted NW and W. On 25-26 August the emissions had a low intensity explosive component. On most nights incandescence was observed, increasing with larger emissions. On 23 August slight amounts of ash were reported northwest of the volcano in the communities of Amecameca, Ozumba, and Tlalmanalco. On most days there was only partial visibility due to cloud cover, and on 25-26 August heavy cloud cover was reported. On 24 August the Washington VAAC reported emissions but ash was not detected by satellite. The Alert Level remained at to Yellow, Phase Two.

Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)

Reventador | 20 August-26 August 2014 | Continuing ActivityCite this Report

Reventador
Ecuador

During 20-26 August IG reported moderate to high volcanic activity at Reventador, including explosions, long-period earthquakes, harmonic tremor, and tremor. On 20 August ash plumes, observed through partly cloudy skies, remained near the volcano. On 26 August in the morning hours emissions of water vapor were reported above the crater drifting SW. The volcano was obscured by clouds the other days of the week. On 24 August the Washington VAAC reported an emission with light ash to 6 km (20,000 ft) a.s.l. identified by wind and satellite data, seismic detection, and pilot report.

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

Sabancaya | 20 August-26 August 2014 | Continuing ActivityCite this Report

Sabancaya
Peru

IGP reported that on 24-25 August an increase in volcano-tectonic and long-period earthquakes, and during 23-25 August there was a slight increase in white to blueish white fumarolic emissions that rose 500-1500 m above the summit of Sabancaya. On 25 August during the night instruments detected a sequence of explosive events that lasted 82 seconds. On 26 August INGEMMET reported long-period, volcano-tectonic, and hybrid earthquakes. White to light gray plumes rose 100-1300 m above the summit drifting SE.

Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)

San Miguel | 20 August-26 August 2014 | Continuing ActivityCite this Report

San Miguel
Eastern El Salvador

On 20-26 August SNET reported low seismic activity at San Miguel. On most days short pulses of white and whitish gray steam plumes were observed at the summit.

Source: Servicio Nacional de Estudios Territoriales (SNET)

Santa Maria | 20 August-26 August 2014 | Continuing ActivityCite this Report

Santa Maria
Southwestern Guatemala

On 20-25 August, INSIVUMEH reported lava flowing towards Upper Nima Canyon I and incandescence within the Santiaguito crater at night. On most days collapses of the lava flow generate fine ash that drifts up to 700 m SW, S, and SE. Fumarolic degassing plumes rose 100-200 m above the crater and drifted up to 2.9 km SW, S, and SE.

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

Sheveluch | 20 August-26 August 2014 | Continuing ActivityCite this Report

Sheveluch
Central Kamchatka (Russia)

KVERT reported that during 15-21 August lava-dome extrusion onto Sheveluch’s SE flank was accompanied by moderate ash explosions, incandescence of the dome summit, hot avalanches, and fumarolic activity. Satellite data showed a thermal anomaly over the lava dome on 18-19 August. The volcano was obscured by clouds the other days of week. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Shishaldin | 20 August-26 August 2014 | Continuing ActivityCite this Report

Shishaldin
Fox Islands (USA)

AVO reported that during 20-26 August low-level eruptive activity continued at Shishaldin volcano. A steam and gas plume was visible in web camera and satellite images occasionally during the week. On 20 August satellite images showed a steam plume extending 60 km N of the volcano. On 23 August a pilot reported a steam-and-ash plume rose about 300 m (1,000 ft) above the summit and drifted NE. On 20-22 and 26 August elevated surface temperatures at the summit were detected in clear satellite views. Infrasound sensors located in Dillingham and on Akutan Island detected sound waves from the direction of Shishaldin that were consistent with low-level eruptive activity. No significant activity noted in seismic data. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Tungurahua | 20 August-26 August 2014 | Continuing ActivityCite this Report

Tungurahua
Ecuador

During 20-26 August IG reported that moderate to high eruptive activity continued at Tungurahua, including volcanic tremor, explosions, and long-period earthquakes. On most days explosions described as “canon like” blasts, roars, and “gunfire” were heard near the volcano and rattled windows in the town of Baños on 21 August. On most days ash plumes rose 1.5-5 km (4,900-16,400 ft) above the crater rim and drifted W and SW. On 22-23 August views through intermittent clouds showed blocks falling on the E flank of the volcano and on 24-25 August incandescent blocks fell 1-1.5 km below the crater rim. On 23-26 ashfall was reported in several areas, including Bilbao, Chacauco, Mocha, Choglontus, Tisaleo, and El Manzano. On 26 August muddy water was observed after rains in Mapayacu Gorge. On most days the Washington VAAC reported ongoing and continuous emissions. On 21 August the Washington VAAC reported emissions rose to 6 km (20,000 ft) a.s.l. and on 24 August emissions rose to 8.5 km (28,000 ft) a.s.l. On 26 August short duration explosions were reported.

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

Ubinas | 20 August-26 August 2014 | Continuing ActivityCite this Report

Ubinas
Peru

During 20-26 August INGEMMET reported that the eruption of Ubinas was continuing. During 20-25 August water vapor, gas, and minor ash plumes rose 200-1800 m above the crater and drifted E, NE, and S. On 21 August an explosion was followed by an ash plume that rose 4.2 km (13,800 ft) above the summit and drifted S and expelled incandescent blocks up to 2 km from the crater, primarily on the S flank. The explosion was heard up to 10 km from the volcano. On 22 August an ash plume rose to 1.8 km (5,900 ft) and drifted E and NE. On 21-22 August ashfall was reported in the towns of Querapi, Ubinas, Escacha, Tonohaya, and Yalahua.

Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Buenos Aires Volcanic Ash Advisory Center (VAAC), Instituto Geofísico del Perú (IGP)

Zhupanovsky | 20 August-26 August 2014 | Continuing ActivityCite this Report

Zhupanovsky
Eastern Kamchatka (Russia)

KVERT reported that during 15-21 August that moderate explosive eruption continued at Zhupanovsky. Satellite data showed a thermal anomaly over the volcano on 16-17 August. On 18 and 15 August the volcano was obscured by clouds. The Tokyo VAAC reported ash plumes rose to 3-4.5 km (10,000-15,000 ft) a.s.l. and drifted S and SSE. On August 19 KVERT reported that satellite data showed ash plumes drifted 51 km S of the volcano and on August 20 that ash plumes rose to 3 km (9800 ft) a.s.l. and drifted 110 km SSE.

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

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Criteria & Disclaimers

Criteria

The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:

- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.

Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.

It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.

Disclaimers

1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are cover longer time periods and are more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.

2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.

3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.

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Acronyms and Abbreviations

a.s.l. - above sea level

AVO - Alaska Volcano Observatory

AVHRR - Advanced Very High Resolution Radiometer

CENAPRED - Centro Nacionale de Prevencion de Desastres (México)

CONRED - Coordinadora Nacional para la Reducción de Desastres

COSPEC - Correlation Spectrometer

CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation

CVO - Cascades Volcano Observatory (USGS)

GMS - Geostationary Meteorological Satellite

GOES - Geostationary Operational Environmental Satellite

GVO - Goma Volcano Observatory

GVP - Global Volcanism Program (Smithsonian Institution)

HVO - Hawaiian Volcano Observatory (USGS)

ICE - Instituto Costarricense de Electricidad (Costa Rica)

IG - Instituto Geofísico (Ecuador)

IGNS - Institute of Geological and Nuclear Sciences (New Zealand) - now GNS Science

INETER - Instituto Nicaragüense de Estudios Territoriales (Nicaragua)

INGEMMET - Instituto Geológical Minero y Metalúrgico (Peru)

INGEOMINAS - Instituto Colombiano de Geología y Minería (Colombia)

INGV-CT - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (Italy)

INSIVUMEH - Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia (Guatemala)

IRD - Institut de Recherche pour le Développement (France)

JMA - Japanese Meteorological Agency

KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department

KVERT - Kamchatkan Volcanic Eruption Response Team

M - magnitude

METEOSAT - Meteorological Satellite

MEVO - Mount Erebus Volcano Observatory

MODIS - Moderate Resolution Imaging Spectroradiometer

MVO - Montserrat Volcano Observatory

MWO - Meteorological Watch Office

NEIC - National Earthquake Information Center

NIED - National Research Institute for Earth Science and Disaster Prevention (Japan)

NOAA - National Oceanic and Atmospheric Administration

NOTAM - Notice to Airmen

OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)

OFDA - Office of US Foreign Disaster Assistance

ONEMI - Oficina Nacional de Emergencia - Ministerio del Interior (Chile)

OVPDLF - Observatoire Volcanologique du Piton de la Fournaise (France)

OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)

PHIVOLCS - Philippine Institute of Volcanology and Seismology (Philippines)

RSAM - Real-time Seismic Amplitude Measurement

RVO - Rabaul Volcano Observatory

SERNAGEOMIN - Servicio Nacional de Geologia y Mineria (Chile)

SIGMET - Significant Meteorological Information

SNET - Servicio Nacional de Estudios Territoriales (El Salvador)

SVERT - Sakhalin Volcanic Eruption Response Team (Russia)

USAID - US Agency for International Development

USGS - United States Geological Survey

UTC - Coordinated Universal Time

VAAC - Volcanic Ash Advisory Center

VAFTAD - Volcanic Ash Forecast Transport And Dispersion

VDAP - Volcano Disaster Assistance Program (USGS)

VHP - Volcano Hazards Program (USGS)

VRC - Volcano Research Center (Japan)

Report for Bardarbunga
During 20-26 August the Icelandic Met Office reported ongoing high rates of seismic activity at Bárdarbunga volcano. Global Postioning System and seismic data indicated that an intrusive dike had increased from 25 to 40 km in length E, NE, and N of the volcano over the past week. During 22-26 August several earthquakes in the 4.7-5.7 magnitude range had been detected at or near the volcano. On 23 August seismic tremor indicated a small lava-eruption 150-400 m beneath the Dyngjujökull glacier, prompting a change in the Aviation Color Code to Red. On 24 August observations from an overflight indicated there was no eruption and the Aviation Color Code was changed to Orange. On 26 August the location of the seismicity was located primarily along the 10 km long tip of the dike that extended 5 km beyond the glacier margin.
Source: Icelandic Meteorological Office (IMO)

Report for Aira
During 20-26 August JMA reported 17 explosions from Showa Crater at Aira Caldera’s Sakurajima volcano that were accompanied by volcanic earthquakes and volcanic tremor, and which ejected ballistics 500-800 m away. On 20-24 August clear incandescence was visible using high-sensitivity camera at night. On 20-26 August the Tokyo VAAC reported explosions with plumes that rose to an altitude of 1.2-2.7 km (4,000-9,000 ft) a.s.l. and drifted NE and N, though volcanic ash could not be identified in satellite data. The Alert Level remained at 3 (on a scale of 1-5).
Sources: Japan Meteorological Agency (JMA), Japan Meteorological Agency (JMA)

Report for Bagana
During 25-26 August the Darwin VAAC reported ash plumes at Bagana that rose 2.1-2.4 km (7,000-8,000 ft) a.s.l. and drifted 65-120 km W and WNW. The Aviation Color Code remained at Orange.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Report for Batu Tara
Based on analyses of satellite data, the Darwin VAAC reported an ash plume from Batu Tara on 26 June that drifted 35-55 km NW and W. The Aviation Color Code remained at Orange.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Report for Dukono
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 20-21 August a low-level plume from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 37 km NW and N.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Report for Fuego
During 20-26 August, INSIVUMEH reported that weak to moderate explosions at Fuego expelled blocks up to 800 m above the rim. On most days white plumes rose 200-600 m above the crater and drifted SW and W and on 25 August the white plume rose to 4.2 km (13,800 ft) above the crater. Ash plumes rose 4.1-4.6 km (13,500-15,100 ft) a.s.l. and drifted 10-15 km NE, W, S and SW. Ashfall was reported in villages Morelia (9 km SW), Panimaché (8 km SW), Panimaché II, Sangre de Cristo (8 km WSW), and Hagia Sophia. On most days rumbling was heard around the volcano and rattled structures near the volcano on 24 August. On 21 and 25 August were jet engine like sounds lasting 1-4 minutes. Weak to moderate avalanches of blocks were channeled into the canyons Las Lajas (SE), Trinidad (S), Ceniza (SSW), Taniluyá (SW), Santa Teresa and Honda.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Report for Kilauea
During 20-26 August HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Gas emissions remained elevated. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas; smaller particles may have been dropped several kilometers away. On 23 August part of the deep inner ledge surrounding the lava lake collapsed, disrupting the lava lake surface for a short time.

During 20-26 August glow was visible overnight above several outgassing openings in Pu`u `O`o's crater floor and on 20-21 August glow was visible at skylights along the June 27th flow lava tube. On 22 August observations during a helicopter flight showed the June 27th flow had poured into a deep, large crack of Kilauea’s east rift zone and produced a line of steaming that advanced eastward. On 25 August an overflight confirmed that lava in the crack had returned to the surface, creating a small, isolated pad of lava. On 26 August the farthest portion of this new pad of lava was about 11.4 km from the vent on Pu`u `O`o and about 3.1 km from the eastern boundary of the Wao Kele o Puna Forest Reserve. A separate branch of the June 27th flow continued to advance into a different section of forest northeast of Pu`u `O`o and was 7.3 km from the vent on 25 August.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Report for Kuchinoerabujima
JMA reported that during 20-26 August there were few episodes of volcanic tremor and volcanic earthquakes, with no explosions at Kuchinoerabujima. On most days a white plume rose 20-400m above the crater rim. The Alert Level for Kuchinoerabujima remained at 3 (on a scale of 1-5).
Source: Japan Meteorological Agency (JMA)

Report for Kusatsu-Shiranesan
On 20-22 August JMA reported volcanic earthquakes continuing at Kusatsu-Shiranesan’s crater, although decreased from early August and tremor was absent. The Alert Level remains at 2 (on a scale of 1-5).
Source: Japan Meteorological Agency (JMA)

Report for Mayon
During 20-26 August PHIVOLCS reported no incandescence at Mayon, despite the emergence of a summit dome, slight ground deformation, and increased volcanic gas emission. On most days seismic instruments recorded a few rock falls and sparse earthquakes. During 20-25 August observers noted moderate emission of white steam plumes that drifted SW, WSW, NE, ENE, and SSW. The Alert Level remained at 2 (on a scale of 0-5).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Report for Pacaya
INSIVUMEH reported that during 20-26 August white and blueish white fumarolic plumes rose 50-150 m above Mackenney Crater at Pacaya and drifted 500-800 m S and SW. On 25 August small bursts of gray ash rose 300-700 m above the crater and drifted S.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Report for Popocatepetl
CENAPRED reported that during 20-26 August steam-and-gas emissions with minor ash rose 100-800 m above Popocatépetl’s crater and drifted NW and W. On 25-26 August the emissions had a low intensity explosive component. On most nights incandescence was observed, increasing with larger emissions. On 23 August slight amounts of ash were reported northwest of the volcano in the communities of Amecameca, Ozumba, and Tlalmanalco. On most days there was only partial visibility due to cloud cover, and on 25-26 August heavy cloud cover was reported. On 24 August the Washington VAAC reported emissions but ash was not detected by satellite. The Alert Level remained at to Yellow, Phase Two.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)

Report for Reventador
During 20-26 August IG reported moderate to high volcanic activity at Reventador, including explosions, long-period earthquakes, harmonic tremor, and tremor. On 20 August ash plumes, observed through partly cloudy skies, remained near the volcano. On 26 August in the morning hours emissions of water vapor were reported above the crater drifting SW. The volcano was obscured by clouds the other days of the week. On 24 August the Washington VAAC reported an emission with light ash to 6 km (20,000 ft) a.s.l. identified by wind and satellite data, seismic detection, and pilot report.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Report for Sabancaya
IGP reported that on 24-25 August an increase in volcano-tectonic and long-period earthquakes, and during 23-25 August there was a slight increase in white to blueish white fumarolic emissions that rose 500-1500 m above the summit of Sabancaya. On 25 August during the night instruments detected a sequence of explosive events that lasted 82 seconds. On 26 August INGEMMET reported long-period, volcano-tectonic, and hybrid earthquakes. White to light gray plumes rose 100-1300 m above the summit drifting SE.
Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)

Report for San Miguel
On 20-26 August SNET reported low seismic activity at San Miguel. On most days short pulses of white and whitish gray steam plumes were observed at the summit.
Source: Servicio Nacional de Estudios Territoriales (SNET)

Report for Santa Maria
On 20-25 August, INSIVUMEH reported lava flowing towards Upper Nima Canyon I and incandescence within the Santiaguito crater at night. On most days collapses of the lava flow generate fine ash that drifts up to 700 m SW, S, and SE. Fumarolic degassing plumes rose 100-200 m above the crater and drifted up to 2.9 km SW, S, and SE.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Report for Sheveluch
KVERT reported that during 15-21 August lava-dome extrusion onto Sheveluch’s SE flank was accompanied by moderate ash explosions, incandescence of the dome summit, hot avalanches, and fumarolic activity. Satellite data showed a thermal anomaly over the lava dome on 18-19 August. The volcano was obscured by clouds the other days of week. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Report for Shishaldin
AVO reported that during 20-26 August low-level eruptive activity continued at Shishaldin volcano. A steam and gas plume was visible in web camera and satellite images occasionally during the week. On 20 August satellite images showed a steam plume extending 60 km N of the volcano. On 23 August a pilot reported a steam-and-ash plume rose about 300 m (1,000 ft) above the summit and drifted NE. On 20-22 and 26 August elevated surface temperatures at the summit were detected in clear satellite views. Infrasound sensors located in Dillingham and on Akutan Island detected sound waves from the direction of Shishaldin that were consistent with low-level eruptive activity. No significant activity noted in seismic data. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Source: US Geological Survey Alaska Volcano Observatory (AVO)

Report for Tungurahua
During 20-26 August IG reported that moderate to high eruptive activity continued at Tungurahua, including volcanic tremor, explosions, and long-period earthquakes. On most days explosions described as “canon like” blasts, roars, and “gunfire” were heard near the volcano and rattled windows in the town of Baños on 21 August. On most days ash plumes rose 1.5-5 km (4,900-16,400 ft) above the crater rim and drifted W and SW. On 22-23 August views through intermittent clouds showed blocks falling on the E flank of the volcano and on 24-25 August incandescent blocks fell 1-1.5 km below the crater rim. On 23-26 ashfall was reported in several areas, including Bilbao, Chacauco, Mocha, Choglontus, Tisaleo, and El Manzano. On 26 August muddy water was observed after rains in Mapayacu Gorge. On most days the Washington VAAC reported ongoing and continuous emissions. On 21 August the Washington VAAC reported emissions rose to 6 km (20,000 ft) a.s.l. and on 24 August emissions rose to 8.5 km (28,000 ft) a.s.l. On 26 August short duration explosions were reported.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)

Report for Ubinas
During 20-26 August INGEMMET reported that the eruption of Ubinas was continuing. During 20-25 August water vapor, gas, and minor ash plumes rose 200-1800 m above the crater and drifted E, NE, and S. On 21 August an explosion was followed by an ash plume that rose 4.2 km (13,800 ft) above the summit and drifted S and expelled incandescent blocks up to 2 km from the crater, primarily on the S flank. The explosion was heard up to 10 km from the volcano. On 22 August an ash plume rose to 1.8 km (5,900 ft) and drifted E and NE. On 21-22 August ashfall was reported in the towns of Querapi, Ubinas, Escacha, Tonohaya, and Yalahua.
Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Buenos Aires Volcanic Ash Advisory Center (VAAC), Instituto Geofísico del Perú (IGP)

Report for Zhupanovsky
KVERT reported that during 15-21 August that moderate explosive eruption continued at Zhupanovsky. Satellite data showed a thermal anomaly over the volcano on 16-17 August. On 18 and 15 August the volcano was obscured by clouds. The Tokyo VAAC reported ash plumes rose to 3-4.5 km (10,000-15,000 ft) a.s.l. and drifted S and SSE. On August 19 KVERT reported that satellite data showed ash plumes drifted 51 km S of the volcano and on August 20 that ash plumes rose to 3 km (9800 ft) a.s.l. and drifted 110 km SSE.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)