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Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

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 May-26 May 2009
Name Location Eruption Start Date Report Status
Karangetang Sangihe Islands 2018 Nov 25 New
Reventador Ecuador 2008 Jul 27 New
Slamet Central Java New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Barren Island Andaman Islands (India) 2022 Dec 30 Continuing
Batu Tara Komba Island Continuing
Chaiten Southern Chile Continuing
Colima Mexico Continuing
Dukono Halmahera 1933 Aug 13 Continuing
Ebeko Paramushir Island (Russia) 2022 Jun 11 Continuing
Fuego South-Central Guatemala 2002 Jan 4 Continuing
Kilauea Hawaiian Islands (USA) 2021 Sep 29 Continuing
Llaima Central Chile Continuing
Rabaul New Britain (Papua New Guinea) Continuing
Redoubt Alaska Peninsula Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Soufriere Hills Montserrat Continuing
Suwanosejima Ryukyu Islands (Japan) 2004 Oct 23 Continuing
Tungurahua Ecuador Continuing
Ubinas Peru 2023 Jun 22 Continuing
Veniaminof Alaska Peninsula, Alaska Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 19,386 individual reports over 1,186 weeks (average of 16 per week) on 331 different volcanoes.

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Use the dropdowns to choose the year and week for archived Weekly Reports.

Use the dropdowns to choose the year and week for archived Weekly Reports.          



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Agung Cotopaxi Ijen Lewotobi Peuet Sague South Sarigan Seamount
Ahyi Cuicocha Iliamna Lewotolok Pinatubo Spurr
Aira Cumbal Iliwerung Little Sitkin Planchon-Peteroa St. Helens
Akan Dabbahu Inielika Llaima Poas Stromboli
Alaid Davidof Ioto Lokon-Empung Popocatepetl Sulu Range
Alu-Dalafilla Dempo Irazu Lonquimay Purace Sumbing
Ambae Descabezado Grande Iya Lopevi Puyehue-Cordon Caulle Sundoro
Ambang Dieng Volcanic Complex Izu-Torishima Machin Rabaul Suretamatai
Ambrym Dukono Jackson Segment Makushin Raikoke Suwanosejima
Anatahan Ebeko Kaba Maly Semyachik Ranakah Taal
Aniakchak Ebulobo Kadovar Manam Raoul Island Tair, Jebel at
Antillanca Volcanic Complex Edgecumbe Kaitoku Seamount Manda Hararo Rasshua Takawangha
Antuco Egon Kama'ehuakanaloa Marapi Raung Talang
Apoyeque Ekarma Kambalny Maroa Redoubt Tambora
Arenal Eldey Kanaga Martin Reventador Tanaga
Asamayama Epi Kanlaon Masaya Reykjanes Tandikat-Singgalang
Askja Erebus Karangetang Maule, Laguna del Rincon de la Vieja Tangkoko-Duasudara
Asosan Erta Ale Karkar Mauna Loa Rinjani Tangkuban Parahu
Atka Volcanic Complex Etna Karthala Mayon Ritter Island Tara, Batu
Augustine Etorofu-Yakeyama [Grozny Group] Karymsky McDonald Islands Rotorua Ta'u
Avachinsky Eyjafjallajokull Kasatochi Melimoyu Ruang Taupo
Awu Fagradalsfjall Katla Merapi Ruapehu Telica
Axial Seamount Fernandina Katmai Midagahara Ruby Tenerife
Azul, Cerro Fogo Kavachi Misti, El Ruiz, Nevado del Tengger Caldera
Azumayama Fonualei Kelimutu Miyakejima Sabancaya Three Sisters
Bagana Fournaise, Piton de la Kelud Momotombo Sakar Tinakula
Balbi Fourpeaked Kerinci Monowai Salak Tofua
Bamus Fuego Ketoi Montagu Island San Cristobal Tokachidake
Banda Api Fujisan Kharimkotan Moyorodake [Medvezhia] San Miguel Tolbachik
Bardarbunga Fukutoku-Oka-no-Ba Kick 'em Jenny Mutnovsky San Vicente Toliman
Barren Island Galeras Kie Besi Myojinsho Sangay Tongariro
Batur Galunggung Kikai Nabro Sangeang Api Trident
Bezymianny Gamalama Kilauea Negra, Sierra Santa Ana Tungurahua
Bogoslof Gamkonora Kirishimayama Negro, Cerro Santa Maria Turrialba
Brava Gareloi Kita-Ioto Nightingale Island Sao Jorge Ubinas
Bristol Island Gaua Kizimen Nishinoshima Sarigan Ugashik-Peulik
Bulusan Gorely Klyuchevskoy Nisyros Sarychev Peak Ukinrek Maars
Calbuco Great Sitkin Kolokol Group Novarupta Saunders Ulawun
Callaqui Grimsvotn Koryaksky NW Rota-1 Savo Unnamed
Cameroon Guagua Pichincha Krakatau Nyamulagira Semeru Unnamed
Campi Flegrei del Mar di Sicilia Guallatiri Krummel-Garbuna-Welcker Nyiragongo Semisopochnoi Veniaminof
Cayambe Guntur Krysuvik-Trolladyngja Ofu-Olosega Seulawah Agam Villarrica
Chachadake [Tiatia] Hachijojima Kuchinoerabujima Okataina Sheveluch Vulcano
Chaiten Hakoneyama Kurikomayama Okmok Shishaldin West Mata
Chiginagak Heard Kusatsu-Shiranesan Ontakesan Simbo Westdahl
Chikurachki Hekla Kverkfjoll Oraefajokull Sinabung Whakaari/White Island
Chiles-Cerro Negro Helgrindur La Palma Osorno Sinarka Witori
Chillan, Nevados de Hierro Lamington Pacaya Siple Wolf
Chirinkotan Hokkaido-Komagatake Lamongan Pagan Sirung Yakedake
Chirpoi Home Reef Langila Palena Volcanic Group Slamet Yasur
Ciremai Hood Lanin Paluweh Snaefellsjokull Yufu-Tsurumi
Cleveland Huaynaputina Lascar Panarea Soputan Zaozan [Zaosan]
Colima Hudson, Cerro Late Papandayan Sorikmarapi Zavodovski
Colo Huila, Nevado del Lateiki Parker Sotara Zhupanovsky
Concepcion Hunga Tonga-Hunga Ha'apai Lengai, Ol Doinyo Pavlof Soufriere Hills Zubair Group
Copahue Ibu Leroboleng Pelee Soufriere St. Vincent
 News Feeds and Google Placemarks


Download Smithsonian / USGS Weekly Volcanic Activity Report Network RSS Feed

The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. At the end of each report is a list of the sources used. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. This feature was first made available on 5 March 2008.



Download Smithsonian / USGS Weekly Volcanic Activity Report Network CAP Feed

The CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management. They are similar in content to the RSS feed, but contain no active links.



Download Smithsonian/USGS Weekly Volcanic Activity Report Network Link Download Smithsonian / USGS Weekly Volcanic Activity Report Network Link

A Google Earth network link for the Weekly Volcanic Activity Report can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano profile page and to the complete Weekly Report for that week. This feature was first made available on 1 April 2009.

 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.

4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.

5. USGS Disclaimer Statement for this Website:

Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.

Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL: https://volcano.si.edu/reports_weekly.cfm

 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 Karangetang
Based on a pilot observation, the Darwin VAAC reported that on 24 May an ash plume from Karangetang rose to an altitude of 3.7 km (12,000 ft) a.s.l. and drifted 75 km S.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Reventador
Based on a pilot observation and a SIGMET notice, the Washington VAAC reported that on 26 May a diffuse ash plume from Reventador rose to an altitude of 6.4 km (21,000 ft) a.s.l. and drifted SW. Thermal anomalies were intermittently seen on satellite imagery. Gas plumes with some possible ash were noted later that day.
Source: Washington Volcanic Ash Advisory Center (VAAC)
Report for Slamet
On 26 May, CVGHM reported that since 21 April seismicity from Slamet continued to increase or remain elevated; the peak of activity was on 17 May. White-to-brown "eruption smoke" rose about 800 m above the crater and inflation was detected. Ashfall was detected in areas 5-9 km away. The temperature of water in several locations on the flanks increased. During 12 and 21-23 May, lava fountains rose 100-400 m above the crater rim. White-to-gray "smoke" rose 150 m above the crater and ejected incandescent material onto the W flank. On 22 May, ashfall was reported in Sawangan village, 5 km W. On 23 May, an ash plume rose 1 km above the crater and ash fell on the N flank. Ash accumulated to1 mm near the observation post. The next day, an ash plume rose 700 m above the crater. The Alert Level remained at 3 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Aira
Based on information from JMA, the Tokyo VAAC reported that on 26 May an eruption from Sakura-jima produced a plume that rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted NW.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Barren Island
Based on analysis of satellite imagery, the Darwin VAAC reported that on 20 May an ash plume from Barren Island rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 75 km NE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Batu Tara
Based on analysis of satellite imagery, the Darwin VAAC reported that on 20 May ash plumes from Batu Tara rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 65 km NW. On 26 May, an ash plume rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 55 km NW. A thermal anomaly was also identified on satellite imagery.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Chaiten
SERNAGEOMIN reported that time-lapse photographs of Chaitén taken during 12-19 May showed the continued eruption of the Domo Nuevo 1 and Domo Nuevo 2 lava-dome complex. Gas-and-ash plumes that varied in color from white to gray rose 1.5 km above the complex. Collapses originating from unstable slopes of the lava domes generated block-and-ash flows. Growth was concentrated in the SW area of the lava-dome complex. The Alert Level remained at Red. Based on web camera views, analysis of satellite imagery, and a SIGMET notice, the Buenos Aires VAAC reported that on 21 and 26 May ash plumes rose to altitudes of 2.4-3.7 km (8,000-12,000 ft) a.s.l. Plumes drifted SSE on 21 May and 45-50 km NE on 26 May.
Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Buenos Aires Volcanic Ash Advisory Center (VAAC)
Report for Colima
The government of the state of Colima reported that during 21-25 May white and gray plumes from Colima rose to altitudes of 3.9-4.2 km (12,800-13,800 ft) a.s.l. and drifted E, SE, and S.
Source: Gobierno del Estado de Colima
Report for Dukono
Based on analysis of satellite imagery, the Darwin VAAC reported that on 26 May an ash plume from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 90 km N.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Ebeko
Based on analysis of satellite imagery and information from Yelizovo Airport, the Tokyo VAAC reported that on 22 May an ash plume from Ebeko rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted SE.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Fuego
INSIVUMEH reported that on 21 May lahars descended the Santa Teresa and Ceniza ravines to the W and SW of Fuego, respectively, and carried fine material as well as blocks up to 2 m in diameter. During 25-26 May, explosions produced ash plumes that rose to altitudes of 4.1-4.7 km (13,500-15,400 ft) a.s.l. and drifted W, SW, S, and SE. Some rumbling noises were reported. On 25 May, fumarolic plumes rose to an altitude of 4.2 km (13,800 ft) a.s.l. and drifted S and SE. Ashfall was reported in areas to the W and WSW on 26 May.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Kilauea
During 20-26 May, HVO reported that lava flowed SE from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the Waikupanaha and Kupapa'u ocean entries. The vent in Halema'uma'u crater continued to produce a predominantly white plume that rose 200-300 m. The plume drifted N, NE, and SW, and caused poor air quality in the summit region. Small amounts of usually ash-sized tephra, including Pele's hair, Pele's tears, and glassy spatter, were retrieved from collection bins placed near the plume during the reporting period. A molten lava pool near the base of the cavity, deep below the floor of the vent, produced incandescence of variable intensity. Sounds resembling rushing gas and rockfalls were heard in the vicinity of the crater on 26 May.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Llaima
During 12-18 May, SERNAGEOMIN reported sporadic incandescence from an area in the SW part of Llaima's main crater, corresponding to a small active "outcrop of lava." Steam plumes rose from the same area. The Volcano Alert Level remained at Yellow.
Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Report for Rabaul
RVO reported that during 14-20 May white and occasionally blue plumes from Rabaul caldera's Tavurvur cone rose 1 km above the crater. Incandescence from the summit crater was seen at night. Based on analysis of satellite imagery, the Darwin VAAC reported that during 20-21 May ash plumes rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 30-40 km SE and SW.
Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Redoubt
AVO reported that during 20-26 May seismicity from Redoubt remained above background levels and growth of the lava dome in the summit crater continued. Steam-and-gas emissions from the lava dome were seen on the web camera during 20-21 and 26 May; clouds obscured the view during the rest of the reporting period. Occasional rockfalls originating from unstable slopes of the lava dome possibly produced minor ash clouds in the vicinity of the summit, although no ash was detected by satellite or radar. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Sheveluch
KVERT reported that during 15-22 May seismic activity from Shiveluch was above background levels. A hot avalanche seen on a video camera on 16 May produced an ash plume that rose to an altitude of 4.5 km (14,800 ft) a.s.l. During 17-18 May, observers reported active fumaroles. Based on interpretations of seismic data, ash plumes were likely present during the reporting period; a possible ash plume rose to an altitude of 5.3 km (17,400 ft) a.s.l. on 21 May. Analysis of satellite imagery revealed a daily thermal anomaly over the lava dome. The Level of Concern Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Soufriere Hills
MVO reported that during 15-22 May activity from the Soufrière Hills lava dome had increased slightly, but remained overall at a low level. Seismic activity increased slightly; tectonic earthquakes were noted on 16, 18, 20, and 21 May at depths less than 3 km beneath the lava dome. Lahars traveled down multiple river valleys on 18 May. Two possible explosions were detected on 21 May. The second and larger signal was followed by an ash plume that was seen drifting to the W over Gages Mountain. During 21-22 May, a strong smell of sulfur dioxide was noted from Salem (6 km NW) to Woodlands (1 km N of Salem).The Hazard Level remained at 3.
Source: Montserrat Volcano Observatory (MVO)
Report for Suwanosejima
Based on analysis of satellite imagery and pilot observations, the Tokyo VAAC reported that on 25 May an ash plume from Suwanose-jima rose to an altitude of 1.5 km (5,000 ft) a.s.l.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Tungurahua
The IG reported that inclement weather often prevented observations of Tungurahua during 20-26 May; ash plumes rose 1-2 km above the summit and drifted W on 22, 24, 25, and 26 May. Occasionally roaring noises were reported and explosions caused structures to vibrate. During 20-23 and 25-26 May, ashfall was reported in areas to the W and SW. During 24-26 May, incandescence from the crater was seen and blocks rolled 100-500 m down the flanks.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Report for Ubinas
Based on SIGMET notices, the Buenos Aires VAAC reported that on 20 May an eruption of Ubinas produced an ash plume that rose to an altitude of 7.3 km (24,000 ft) a.s.l. and drifted NE. Ash was not detected on satellite imagery. According to a news article, two explosions were detected on 25 May. Gas emissions impacted local residents and their fields, prompting residents to request government assistance.
Sources: Peru.com, Buenos Aires Volcanic Ash Advisory Center (VAAC)
Report for Veniaminof
On 26 May, AVO reported that seismicity from Veniaminof had decreased during the previous week. The Volcanic Alert Level was lowered to Normal and the Aviation Color Code was lowered to Green.
Source: US Geological Survey Alaska Volcano Observatory (AVO)