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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, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail.

This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed narratives on various volcanoes are published as reports of the Bulletin of the Global Volcanism Network.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 20 June-26 June 2007
Name Location Eruption Start Date Report Status
Kilauea Hawaiian Islands (USA) 2020 Dec 20 New
Klyuchevskoy Central Kamchatka (Russia) 2019 Apr 9 New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Arenal Costa Rica Continuing
Batu Tara Komba Island (Indonesia) Continuing
Dukono Halmahera (Indonesia) 1933 Aug 13 Continuing
Karangetang Siau Island (Indonesia) 2018 Nov 25 Continuing
Karymsky Eastern Kamchatka (Russia) Continuing
Lokon-Empung Sulawesi (Indonesia) Continuing
Manam Papua New Guinea 2014 Jun 29 Continuing
Rabaul New Britain (Papua New Guinea) Continuing
Reventador Ecuador 2008 Jul 27 Continuing
Semeru Eastern Java (Indonesia) 2014 Apr 1 ± 15 days Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Soputan Sulawesi (Indonesia) Continuing
Soufriere Hills Montserrat Continuing
St. Helens United States Continuing
Talang Indonesia Continuing
Tengger Caldera Eastern Java (Indonesia) Continuing
Tungurahua Ecuador Continuing
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 16,627 individual reports over 1,061 weeks (average of 16 per week) on 312 different volcanoes.

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



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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 monthly, and 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 Kilauea
During 20-26 June, incandescence was not visible from the vents in Kilauea's Pu'u 'O'o crater. A tiltmeter at Pu'u 'O'o continued to show steady tilting inward toward the crater, and the crater floor was estimated to have subsided 100 m between 17 and 21 June.

On 19 June, new ground cracks were discovered in an area west of Mauna Ulu. On 20 June, HVO scientists measured sulfur dioxide concentrations greater than 10 parts per million (ppm) in a broad area adjacent to Halema'uma'u crater. Typical concentrations are generally negligible except for areas downwind of Halema'uma'u crater, where they can get up to 2.5 ppm in narrow zones. On 21 June, scientists confirmed that lava was not entering the ocean at the Poupou entry.

During 21-26 June lava was not visible anywhere on the flow field or at the site of the 18/19 June eruption. The crack W of Kane Nui o Hamo continued to emit steam and fume. The summit area continued to inflate very slowly and seismic tremor values at Pu'u 'O'o were below pre-June 17 levels. On 25 June, sulfur dioxide and carbon dioxide emissions were at approximately pre-June 17 levels after a gradual decline. HVO lowered the Volcanic Alert Level from Watch to Advisory and Aviation Color Code from Orange to Yellow. Aerial observation revealed that steaming from the site of the 18/19 June fissure eruption decreased, though the steaming cracks at the base of Kane Nui o Hamo were vigorously fuming. Ground-based mapping of the new lava flow was also completed; the eruption occurred from two places along the fissure, separated by about 40 m.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Klyuchevskoy
KVERT reported that during 15-22 June, seismic activity at Kliuchevskoi continued above background levels and a thermal anomaly in the crater was detected on satellite imagery. Based on video and visual observations, ash plumes rose to an altitude of 5 km (16,400 ft) a.s.l. and drifted NE on 15 June. Clouds inhibited observations on other days. Plumes were seen drifting N, W, and S on satellite imagery during 15-22 June.

A large ash cloud, about 300 km in diameter, was observed near Yelizovo airport during 20-21 June. Based on atmospheric profiles, the plumes rose to estimated altitudes of 6.5-9.5 km (21,300-31,200 ft) a.s.l. and drifted SE.

On 25 June, KVERT reported that seismic activity decreased during 22-24 June. Ash plumes were visible on satellite imagery drifting multiple directions. The plumes rose to estimated altitudes of 5.5-6.5 km (18,000-21,300 ft) a.s.l. based on atmospheric profiles. A thermal anomaly continued to be detected in the crater. The Level of Concern Color Code was lowered to Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Aira
Based on information from JMA, the Tokyo VAAC reported that eruption plumes from Sakura-jima rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted N during 20-21 June. Ash was not detected on satellite imagery.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Arenal
In May, activity originating from Arenal's Crater C consisted of gas emissions, sporadic Strombolian eruptions, lava flows traveling SW, and occasional avalanches from lava-flow fronts. Blocks from the lava-flow fronts periodically reached vegetation and started small fires. Volcanic activity was at relatively low levels and few eruptions occurred. Small amounts of pyroclastic material were ejected and affected the NE and SE flanks. Eruptions produced ash plumes that rose about 2.2 km (7,100 ft) a.s.l. Ash and acid rain fell on the NE and SE flanks. Small avalanches of volcanic material traveled down several ravines. Crater D showed only fumarolic activity.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Report for Batu Tara
Based on visual observations, CVGHM reported that on 19 June an ash plume from Batu Tara rose to an altitude of 1.7 km (5,600 ft) a.s.l. Clouds inhibited visual observations on the other days during 18-25 June. The Alert Level remained at 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Dukono
Based on visual observations, CVGHM reported that during 18-25 June ash plumes from Dukono rose to an altitude of 1.4 km (4,600 ft) a.s.l. The Alert Level remained at 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Karangetang
Based on visual observations, CVGHM reported that during 18-25 June ash plumes from Karangetang's main crater produced plumes that rose to an altitude of 2 km (6,600 ft) a.s.l. Activity at Crater II consisted of diffuse ash plumes that rose to an altitude of 1.8 km (5,900 ft) a.s.l. and incandescent ash that rose about 10 m. The Alert Level remained at 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Karymsky
During 15-22 June, seismic activity at Karymsky was above background levels and possibly indicated that ash explosions produced plumes to an altitude of 5.8 km (19,000 ft) a.s.l. all days.

Based on information from KEMSD, the Tokyo VAAC reported that eruption plumes rose to 3-4.6 km (10,000-15,000 ft) a.s.l. during 24-25 June. Ash was not identified on satellite imagery.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Lokon-Empung
Based on visual observations, CVGHM reported that during 18-25 June diffuse ash plumes from Lokon-Empung rose to an altitude of 1.6 km (5,200 ft) a.s.l. The Alert Level remained at 2 (on a scale of 1-4). [Correction: diffuse white plumes from Lokon-Empung's Tompaluan crater rose to an altitude of approximately 1.2 km (3,900 ft) a.s.l.]
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Manam
Based on satellite image observations, the Darwin VAAC reported that an eruption plume from Manam rose to an altitude of 3.4 km (11,000 ft) a.s.l. on 23 June and drifted WNW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Rabaul
RVO reported that during 20-26 June, emissions from Rabaul caldera's Tavurvur cone consisted of white vapor plumes containing little ash occasionally accompanied by blue vapor. The plumes rose to an altitude less than 1.7 km (5,600 ft) a.s.l. and drifted W, NW, N, and SSE. Fine ash fell in areas downwind, including Rabaul Town. A mild smell of hydrogen sulfide gas was reported from Rabaul Town. Weak roaring noises were heard and incandescence was visible at night.
Source: Rabaul Volcano Observatory (RVO)
Report for Reventador
Based on seismic interpretation, IG reported that lahars occurred on the flanks of Reventador on 20, 21, and 23 June. Clouds inhibited visual observations during 20-24 June.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
Report for Semeru
Based on visual observations, CVGHM reported that during 18-25 June multiple ash explosions from Semeru produced plumes that rose to an altitude of 4.2 km (13,800 ft) a.s.l. The Alert Level remained at 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Sheveluch
KVERT reported that seismic activity at Shiveluch continued above background levels during 15-22 June. Based on seismic interpretation, ash plumes rose to an altitude of 5.3 km (17,400 ft) a.s.l. during the reporting period. On 15 June, gas-and-steam plumes drifted S. A large thermal anomaly was detected in the crater on satellite imagery during 14-17 and 20 June. The Level of Concern Color Code remained at Orange.

Based on information from KEMSD, the Tokyo VAAC reported that an eruption plume rose to 5.8 km (19,000 ft) a.s.l. during 25-26 June. Ash was not identified on satellite imagery.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Soputan
Based on visual observations, CVGHM reported that during 18-25 June diffuse ash plumes from Soputan rose to an altitude of 1.8 km (5,900 ft) a.s.l. 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 Soufriere Hills
MVO reported that during 20-25 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, however, and predominantly affected the Tar River Valley to the E. The Alert Level remained at 4 (on a scale of 0-5).
Source: Montserrat Volcano Observatory (MVO)
Report for St. Helens
Data from deformation-monitoring instruments indicated that during 20-26 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 some instances, clouds inhibited visual observations.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
Report for Talang
Based on visual observations, CVGHM reported that during 18-25 June thick brown ash plumes from Talang's Main Crater rose to an altitude of 3.1 km (10,200 ft) a.s.l. Diffuse white ash plumes rose to an altitude of about 3 km (10,000 ft) a.s.l. from the South Crater. The Alert Level remained at 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Tengger Caldera
CVGHM reported that during 18-25 June diffuse ash plumes from Tengger Caldera rose to an altitude of 2.4 km (7,900 ft) a.s.l. The Alert Level remained at 2 (on a scale of 1-4). [Correction: CVGHM later confirmed that the plumes did not contain ash.]
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Tungurahua
The IG reported that during 20-25 June mudflows and lahars traveled on the S, W, NW, and N flanks of Tungurahua and interrupted traffic. A steam plume with little ash content was observed on 21 June. On 22 June, ashfall was reported SW in Choglontus and roaring noises were heard. A small landslide occurred on the edge of the Chambo river; another landslide affected a highway. On 23 June, a steam plume with little ash content rose to an altitude of 5.8 km (19,000 ft) a.s.l. and drifted W. The next day, ashfall was reported. During 23-24 June, roaring noises were heard.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)