Logo link to homepage

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 12 July-18 July 2023
Name Location Eruption Start Date Report Status
Bagana Bougainville (Papua New Guinea) 2000 Feb 28 (in or before) New
Fagradalsfjall Iceland New
Kirishimayama Kyushu (Japan) New
Kuchinoerabujima Ryukyu Islands (Japan) New
Langila New Britain (Papua New Guinea) 2015 Oct 22 (?) New
Lokon-Empung Sulawesi New
Mayon Luzon (Philippines) 2023 Apr 27 ± 2 days New
Piton de la Fournaise Reunion Island (France) New
Shishaldin Fox Islands (USA) 2023 Jul 12 New
Ubinas Peru 2023 Jun 22 New
Ulawun New Britain (Papua New Guinea) 2023 Jul 18 New
Ahyi Mariana Islands (USA) Continuing
Dukono Halmahera 1933 Aug 13 Continuing
Ebeko Paramushir Island (Russia) 2022 Jun 11 Continuing
Etna Sicily (Italy) 2022 Nov 27 Continuing
Great Sitkin Andreanof Islands (USA) 2021 May 25 Continuing
Ibu Halmahera 2008 Apr 5 Continuing
Karangetang Sangihe Islands 2018 Nov 25 Continuing
Klyuchevskoy Central Kamchatka (Russia) 2023 Jun 22 Continuing
Lewotolok Lembata Island 2020 Nov 27 Continuing
Merapi Central Java 2020 Dec 31 Continuing
Popocatepetl Mexico 2005 Jan 9 Continuing
Sabancaya Peru 2016 Nov 6 Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Taal Luzon (Philippines) Continuing
Takawangha Andreanof Islands (USA) Continuing
Tanaga Andreanof Islands (USA) Continuing
Villarrica Central Chile 2014 Dec 2 ± 7 days Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 19,832 individual reports over 1,207 weeks (average of 16 per week) on 332 different volcanoes.

Search by Date



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.          



Search by Volcano



Agung Cuicocha Iliwerung Llaima Popocatepetl Sumbing
Ahyi Cumbal Inielika Lokon-Empung Purace Sundoro
Aira Dabbahu Ioto Lonquimay Puyehue-Cordon Caulle Suretamatai
Akan Davidof Irazu Lopevi Rabaul Suwanosejima
Alaid Dempo Iya Machin Raikoke Taal
Alu-Dalafilla Descabezado Grande Izu-Torishima Makushin Ranakah Tair, Jebel at
Ambae Dieng Volcanic Complex Jackson Segment Maly Semyachik Raoul Island Takawangha
Ambang Dukono Kaba Manam Rasshua Talang
Ambrym East Epi Kadovar Manda Hararo Raung Tambora
Anatahan Ebeko Kaitoku Seamount Marapi Redoubt Tanaga
Aniakchak Ebulobo Kama'ehuakanaloa Maroa Reventador Tandikat-Singgalang
Antillanca Volcanic Complex Edgecumbe Kambalny Martin Reykjanes Tangkoko-Duasudara
Antuco Egon Kanaga Masaya Rincon de la Vieja Tangkuban Parahu
Apoyeque Ekarma Kanlaon Maule, Laguna del Rinjani Tara, Batu
Arenal Eldey Karangetang Mauna Loa Ritter Island Ta'u
Asamayama Erebus Karkar Mayon Rotorua Taupo
Askja Erta Ale Karthala McDonald Islands Ruang Telica
Asosan Etna Karymsky Melimoyu Ruapehu Tenerife
Atka Volcanic Complex Etorofu-Yakeyama [Grozny Group] Kasatochi Merapi Ruby Tengger Caldera
Augustine Eyjafjallajokull Katla Midagahara Ruiz, Nevado del Three Sisters
Avachinsky Fagradalsfjall Katmai Misti, El Sabancaya Tinakula
Awu Fernandina Kavachi Miyakejima Sakar Tofua
Axial Seamount Fogo Kelimutu Momotombo Salak Tokachidake
Azul, Cerro Fonualei Kelud Monowai San Cristobal Tolbachik
Azumayama Fournaise, Piton de la Kerinci Montagu Island San Miguel Toliman
Bagana Fourpeaked Ketoi Moyorodake [Medvezhia] San Vicente Tongariro
Balbi Fuego Kharimkotan Mutnovsky Sangay Trident
Bamus Fujisan Kick 'em Jenny Myojinsho Sangeang Api Tungurahua
Banda Api Fukutoku-Oka-no-Ba Kie Besi Nabro Santa Ana Turrialba
Bardarbunga Galeras Kikai Negra, Sierra Santa Maria Ubinas
Barren Island Galunggung Kilauea Negro, Cerro Sao Jorge Ugashik-Peulik
Batur Gamalama Kirishimayama Nightingale Island Sarigan Ukinrek Maars
Bezymianny Gamkonora Kita-Ioto Nishinoshima Sarychev Peak Ulawun
Bogoslof Gareloi Kizimen Nisyros Saunders Unnamed
Brava Gaua Klyuchevskoy Novarupta Savo Unnamed
Bristol Island Gorely Kolokol Group NW Rota-1 Semeru Veniaminof
Bulusan Great Sitkin Koryaksky Nyamulagira Semisopochnoi Villarrica
Calbuco Grimsvotn Krakatau Nyiragongo Seulawah Agam Vulcano
Callaqui Guagua Pichincha Krummel-Garbuna-Welcker Ofu-Olosega Sheveluch West Mata
Cameroon Guallatiri Krysuvik-Trolladyngja Okataina Shishaldin Westdahl
Campi Flegrei del Mar di Sicilia Guntur Kuchinoerabujima Okmok Simbo Whakaari/White Island
Cayambe Hachijojima Kurikomayama Ontakesan Sinabung Witori
Chachadake [Tiatia] Hakoneyama Kusatsu-Shiranesan Oraefajokull Sinarka Wolf
Chaiten Heard Kverkfjoll Osorno Siple Wrangell
Chiginagak Hekla La Palma Pacaya Sirung Yakedake
Chikurachki Helgrindur Lamington Pagan Slamet Yasur
Chiles-Cerro Negro Hierro Lamongan Palena Volcanic Group Snaefellsjokull Yufu-Tsurumi
Chillan, Nevados de Hokkaido-Komagatake Langila Paluweh Soputan Zaozan [Zaosan]
Chirinkotan Home Reef Lanin Panarea Sorikmarapi Zavodovski
Chirpoi Hood Lascar Papandayan Sotara Zhupanovsky
Ciremai Huaynaputina Late Parker Soufriere Hills Zubair Group
Cleveland Hudson, Cerro Lateiki Pavlof Soufriere St. Vincent
Colima Huila, Nevado del Lengai, Ol Doinyo Pelee South Sarigan Seamount
Colo Hunga Tonga-Hunga Ha'apai Leroboleng Peuet Sague Spurr
Concepcion Ibu Lewotobi Pinatubo St. Helens
Copahue Ijen Lewotolok Planchon-Peteroa Stromboli
Cotopaxi Iliamna Little Sitkin Poas Sulu Range
 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 Bagana
An explosive eruption at Bagana on 15 July was similar to one that occurred on 7 July. According to the Darwin VAAC an eruption at around 0830 on 15 July produced an ash plume that rose to 16.5 km (54,000 ft) a.s.l. by 1000 and drifted N based on satellite images. The plume was visible continuing to drift N in an image from 1900 but had dissipated by 2150. Ground-based reports indicated that pyroclastic flows had occurred in the vicinity of the volcano; small deposits confined to one drainage were inspected by RVO during an overflight on 17 July, and were confirmed to be from the 7 July event. The Autonomous Bougainville Government (ABG) issued a statement on 17 July noting significant impacts of ashfall in local communities. According to the National Disaster Centre, ashfall from the first event lasted until 10 July; an eruption was also reported by RVO on 14 July. Ashfall (presumably from events on 7 and 15 July) impacted about 8,111 people in Torokina, South Bougainville, including Tsito/Vuakovi, Gotana (9 km SW), Koromaketo, Kenaia, Longkogari, Kenbaki, Piva (13 km SW), and Atsinima (27km WNW) and in the Tsitovi district according to ABG. Significant ashfall was also reported in Ruruvu (22 km N) in the Wakunai District of Central Bougainville. The Alert Level was at Stage 3 (the third level on a four-level scale), confirmed by RVO the evening before. An evacuation was called for the villages in Wakunai, where heavy ashfall had contaminated water sources; the communities of Ruruvu, Togarau, Kakarapaia, Karauturi, Atao, and Kuritaturi were asked to evacuate to a disaster center at the Wakunai District Station within 24 hours. Communities in Torokina, nearest to Bagana, were to immediately evacuate to the Piva District station.
Sources: Autonomous Bougainville Government, Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC), Papua New Guinea National Disaster Centre
Report for Fagradalsfjall
According to the Institute of Earth Sciences lava continues to eruption from main vent at Fagradalsfjall and travel S and SW. On 14 July the advancing edge of the flow connected with the 2021 lava field in the NE part of Meradalir . The main vent was elongated and about 22 m tall on 15 July. During 13-17 July the lava flow rate was an estimated 12.7 cubic meters per second, and by 18 July the total erupted volume was about 8.4 million cubic meters. The flow advanced an average of 300-400 m per day, though the distance was highly variable. Flow thicknesses averaged 10 m, though some areas reached 20 m. At about 2330 on 18 July lava filled the main cone and occasionally spilled over onto the flanks. A breach high on the NW rim occurred at around 0251 on 19 July and lava flowed down the NW flank. Spatter was ejected beyond the crater rim. At around 0259 lava fountaining increased and lava flowed short distances E. At around 0412 sections of the NW wall of the cone collapsed, draining the crater, and sending lava flows N and W. According to Almannavarnadeild ríkislögreglustjóra and news sources the police closed the pathway to see the eruption on 13 July, then reopened the path to tourists on 17 July. Firefighters were working to control the burning vegetation set on fire by the lava.
Sources: Almannavarnadeild ríkislögreglustjóra (National Commissioner of the Icelandic Police and Department of Civil Protection and Emergency Management), Institute of Earth Sciences
Report for Kirishimayama
JMA reported that during 10-17 July data from the Global Navigation Satellite System (GNSS) indicated continuing minor inflation at shallow depths beneath Ioyama, located on the NW flank of the Karakuni-dake stratovolcano in the Kirishimayama volcano group. A few shallow volcanic earthquakes were recorded. Vigorous fumarolic activity was visible at the fumarolic are on the S side of Ioyama. The Alert Level remained at 2 (on a 5-level scale) and the public was warned to stay 1 km away from Ioyama.
Source: Japan Meteorological Agency (JMA)
Report for Kuchinoerabujima
JMA reported that shallow volcanic earthquakes at Kuchinoerabujima had been frequent since starting in late June, with most epicenters located near Furudake Crater, and some near Shindake Crater (just N of Furudake). Both the number and magnitude of the volcanic earthquakes increased on 9 June and remained elevated through 19 July; there were 285 events on 13 July, 241 on 14 July, 200 on 15 July, 104 on 16 July, 85 on 17 July, and 72 by 1500 on 18 July. The public was warned to stay 2 km away from Furudake. The Alert Level remained at 3 (on a scale of 1-5).
Source: Japan Meteorological Agency (JMA)
Report for Langila
The Darwin VAAC reported that diffuse ash plumes at Langila were visible in satellite images at 1440 on 14 July rising to 1.8 km (6,000 ft) a.s.l. and drifting N. A thermal anomaly was also identified. Diffuse ash emissions continued to be identified in images through most of the next day. The ash emissions had dissipated by 1700 on 15 July; steam-and-gas emissions continued.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Lokon-Empung
PVMBG reported continuing daily steam-and-gas emissions at Lokon-Empung during 12-18 July. White plumes with variable densities rose as high as 400 m above the crater rim and drifted S and N. The Alert Level was raised to 3 (on a scale of 1-4) at 1800 on 17 July and the public was reminded not to approach Tompaluan Crater within a radius of 2.5 km.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Mayon
PHIVOLCS reported that the eruption at Mayon continued during 11-18 July, with slow lava effusion from the summit crater feeding lava flows on the S and SE flanks. The length of the lava flow in the Mi-Isi (S) drainage remained at 2.8 km and the flow in the Bonga (SE) drainage advanced to 2.4 km by 18 July. The lava flow in the Basud drainage on the E flank was 600 m long. Collapses at the lava dome and from the lava flows produced incandescent rockfalls and pyroclastic density currents (PDCs, or pyroclastic flows) that descended the Mi-Isi and Bonga drainages; material also traveled as far as 4 km down the Basud drainage. Steam-and-gas plumes rose 200-750 m above the summit and drifted WSW, W, and ESE during 11-14 July; emissions were not reported on the other days of the week. Sulfur dioxide emissions were reported on most days and showed an increasing trend, averaging between 1,128 and 2,989 tonnes per day, with the highest value recorded on 15 July. Each day seismic stations recorded 150-423 rockfall events and 3-10 PDC events (from dome and lava-front collapses). There were 3-39 volcanic earthquakes recorded on most days, though 184 and 267 were recorded during 16-17 July and 17-18 July, respectively. At 2300 on 16 July the seismic network began recording a continuous series of weak low-frequency volcanic earthquakes (LFVQs). Some of the events were detected by infrasound sensors and produced audible rumbling sounds during the evening of 17 July and the morning of 18 July. By 1530 on 18 July a total of 573 LFVQs had been detected. Most of the events originated from a shallow source and were associated with a rapid release of volcanic gases, though visually there were no changes in effusive activity. The Disaster Response Operations Monitoring and Information Center (DROMIC) reported that as of 1800 on 17 July there were 5,801 families, or 20,257 individuals, that were either in evacuation shelters or staying in other types of alternative housing. The Alert Level remained at 3 (on a 0-5 scale) and residents were reminded to stay away from the 6-km-radius Permanent Danger Zone (PDZ). PHIVOLCS recommended that civil aviation authorities advise pilots to avoid flying close to the summit.
Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Disaster Response Operations Monitoring and Information Center (DROMIC)
Report for Piton de la Fournaise
OVPF reported that the eruption that began on 2 July at Piton de la Fournaise was ongoing during 12-19 July. Though there were multiple active fissures at the start of the eruption, since 3 July only the SE flank fissure was active, located on the upper part of Grandes Pentes at approximately 1,720 m a.s.l. Volcano-tectonic earthquake events (VTs) fluctuated throughout the week but remained low relative to the onset of the eruption. Lava ejections continued to build a cone over the active vent throughout the week, and on 12 July the top of the cone became partially closed. The flow front did not extend any further to the E and remained stalled 1.8 km from the road. Active flows traveled through lava tubes above 1,500 m elevation and continued to widen (increasing about 180 m since 7 July) and thicken. Although clouds often prevented measurements, satellite analysis showed that lava flow rates fluctuated between less than 1 and 13.5 cubic m/s. The total volume of lava effused since the beginning of the eruption was an estimated 6 +/- 3 million cubic meters. There was slight deflation at the summit during 13-16 July, followed by slight inflation during 17-19 July.
Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)
Report for Shishaldin
AVO reported that a new eruption at Shishaldin began after increasing activity. Intermittent tremor and low-frequency earthquakes had gradually become more regular and consistent during 10-11 July, and strongly elevated surface temperatures at the summit were identified in satellite images those same days. The Volcano Alert Level was raised to Advisory (the second level on a four-level scale) and the Aviation Color Code was raised to Yellow (the second color on a four-color scale). Late on 11 July incandescence at the summit was observed in web camera images. Strongly elevated surface temperatures continued to be observed in satellite data and seismic tremor amplitudes increased during 11-12 July; sulfur dioxide emissions were also detected. The observations suggested that lava was likely present at the summit crater, so AVO raised the Volcano Alert Level to Watch and the Aviation Color Code to Orange. The US Coast Guard conducted an overflight on 12 July and confirmed that lava was erupting at the summit.

A significant explosion at 0109 on 14 July produced an ash plume that rose 9-12 km (30,000-40,000 ft) a.s.l. and drifted S. Webcam images and photos taken at around 0700 from a ship SW of Unimak Island showed small lahar deposits (from the interaction of hot pyroclastic material and snow and ice) on the flanks as well as ashfall on the SW and N flanks. A smaller explosion at 0710 generated an ash plume that rose 4.5 km (14,800 ft) a.s.l. Low-level ash emissions continued during the morning based on webcam images and pilot reports.

Seismic tremor amplitude began increasing at around 1700 and remained elevated. An ash plume at an altitude of 4.6 km (15,000 ft) a.s.l. and drifting SSE was visible in a satellite image at 2100. AVO stated that activity had intensified. At 2357 AVO raised the Aviation Color Code to Red and noted that seismicity had remained elevated for over six hours and explosion signals were frequently detected by regional infrasound (pressure sensor) networks. A continuous ash plume extended more than 125 km SSE at an altitude of 4.9 km (16,100 ft) a.s.l., though some of the explosions sent ash plumes as high as 6 km (19,700 ft) a.s.l. Strongly elevated surface temperatures were observed in satellite data during 15-16 July. By 0734 on 16 July explosive activity had declined and seismicity had significantly declined. The Aviation Color Code was lowered to Orange. A remnant ash cloud drifted about 500 km SE before dissipating. Lava continued to erupt at the summit during 16-17 July and produced strongly elevated surface temperatures visible in satellite images. Lava effusion increased at 0100 on 18 July, shown by elevated surface temperatures identified satellite data, increasing seismic tremor, and activity detected on regional infrasound arrays. Activity again intensified and at 0700 a rapidly expanding ash cloud was visible drifting SSE, eventually reaching 9.1 km (30,000 ft) a.s.l. The Aviation Color Code was raised to Red and the Volcano Alert Level was raised to Warning. A Volcano Observatory Notice to Aviation (VONA) issued at 0837 noted that the plume was rising to 7.3 km (24,000 ft) a.s.l. based on recent pilot observations. By 0930 the main ash plume had detached. The eruption gradually declined, so at 1208 the Volcano Alert Level was lowered to Watch and the Aviation Color Code was lowered to Orange. Continuing ash emissions generated plumes that drifted S at altitudes below 3 km (10,000 ft) a.s.l.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Ubinas
Instituto Geofísico del Perú (IGP) reported that the eruption at Ubinas continued at low-to-moderate levels during 10-16 July. During the week there were 80 volcano-tectonic earthquakes indicating rock fracturing and 93 long-period earthquakes signifying the movement of gas and magma. On 16 July there were two seismic signals associated with major explosive events, and 3.6 hours of seismic signals related to ash emissions. Emissions of gas and ash rose to 1.5 km above the summit and drifted as far as 15 km to the E, SE, and S. The Alert Level remained at Orange (the third level on a four-color scale) and the public was warned to stay 4 km away from the crater.
Source: Instituto Geofísico del Perú (IGP)
Report for Ulawun
RVO reported that variable amounts of white steam plumes were visible rising from Ulawun during 1-18 July. Seismicity was low during 1-16 July and consisted of small, discrete, low-frequency earthquakes and occasional small high-frequency volcano-tectonic events. RSAM values generally fluctuated around 50, but during 1800-2300 on 16 July the values increased to 500. The values continued to climb at a slow irregular rate to 610 through 0500 on 18 July, but then dropped to 400-500 during the next two hours (0500-0700), though peaks as high as 1,600 were recorded. By 0700 the values had decreased to 300 and remained steady afterwards. Minor ash emissions began on 18 July and during the morning of 19 July brown-to-gray emissions with low ash content were rising a few hundred meters above the crater rim and drifting SE.
Source: Rabaul Volcano Observatory (RVO)
Report for Ahyi
Signs of unrest at Ahyi Seamount had not been recorded by underwater pressure sensors on Wake Island (2,270 km E) for the previous four weeks (since early June) and satellite observations of discolored water near the seamount was last visible on 22 May. Both the Aviation Color Code and the Volcano Alert Level were lowered to Unassigned on 18 July.
Source: US Geological Survey
Report for Dukono
PVMBG reported that the eruption at Dukono was ongoing during 12-18 July. No ash plumes were reported by PVMBG on 12 July, but according to the Darwin VAAC an ash plume rose to 1.8 km (6,000 ft) a.s.l., or about 600 m above the summit, and drifted NE. White plumes rose as high as 200 m and drifted W on 13 July. Dense white-and-gray plumes rose as high as 400 m above the summit and drifted E during 14-16 July. The Alert Level remained at Level 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Ebeko
KVERT reported that moderate activity at Ebeko was ongoing during 6-13 July. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions during 8-13 July generated ash plumes that rose as high as 4.5 km (14,800 ft) a.s.l and drifted to the E and SE. Thermal anomalies were identified in satellite images during 9 and 11-13 July; weather clouds obscured views on other days. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Etna
INGV reported that during 10-16 July gas emissions rose from some of Etna’s summit craters and Strombolian activity was visible at SE Crater. Pulsating gas emissions at Bocca Nuova Crater were accompanied by roaring noises and nighttime crater incandescence. Fumarolic activity at NE Crater was visible; no activity occurred at Voragine. During most of the week activity at SE Crater was characterized by continuous gas emissions interspersed with ash emissions that rapidly dissipated. Strombolian activity began at 2034 on 14 July from a vent on the E part of the crater and an ash emission rose from the crater at 2037.
Source: Sezione di Catania - Osservatorio Etneo (INGV)
Report for Great Sitkin
AVO reported that slow lava effusion likely continued at Great Sitkin during 12-18 July; continuing effusion was last confirmed by satellite images on 8 July. Several daily local earthquakes were recorded by the seismic network. Weather clouds obscured satellite and webcam views. The Volcano Alert Level remained at Watch (the third level on a four-level scale) and the Aviation Color Code remained at Orange (the third color on a four-color scale).
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Ibu
PVMBG reported that Ibu continued to erupt during 12-18 July. White-and-gray ash plumes of variable densities rose as high as 800 m above the summit and drifted N and E. The Alert Level remained at a 2 (the second highest level on a four-level scale), and the public was advised to stay outside of the 2 km hazard zone, and to stay 3.5 km away from the N area of the active crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Karangetang
PVMBG reported that daily dense white gas-and-steam plumes from Karangetang were visible rising as high as 150 m and drifting multiple directions during 12-19 July. Webcam images published in the reports showed incandescence at the summit and from material on the flanks of Main Crater (S crater). On 12 and 17 July PVMBG reported that seismic signals indicating avalanches were frequent. The Alert Level remained at 3 (on a scale of 1-4) and the public were advised to stay 2.5 km away from Main Crater with an extension to 3.5 km on the S and SE flanks.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Klyuchevskoy
KVERT reported that the minor Strombolian eruption at Klyuchevskoy continued during 6-13 July. A daily thermal anomaly was identified in satellite images. The Aviation Color Code remained at Yellow (the second level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Lewotolok
PVMBG reported that the eruption at Lewotolok continued during 12-18 July. Daily dense white steam-and-gas plumes rose as high as 500 m above the summit and drifted NW, W, and SW. A small plume possibly containing ash was visible in a posted webcam image from 1101 on 13 July. Incandescence at the summit was visible in webcam images from 2129 on 12 July, 1957 on 15 July, and 2205 on 16 July. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay at least 2 km away from the summit crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Merapi
BPPTKG reported that the eruption at Merapi (on Java) continued during 7-13 July and seismicity remained at elevated levels. The SW lava dome produced 152 lava avalanches that traveled as far as 2 km down the SW flank (upstream in the Boyong drainage), three that traveled as far as 800 m down the Boyong drainage, and one that traveled 1.2 km down the Sat/Putih drainage. Morphological changes to the SW lava dome were due to continuing collapses of material. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit based on location.
Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)
Report for Popocatepetl
CENAPRED reported that eruptive activity continued at Popocatépetl during 12-18 July. Long-period events totaling 25-108 per day were accompanied by steam-and-gas plumes that sometimes contained minor amounts of ash. Seismic activity also included variable-amplitude volcanic tremors (16 hours 20 minutes), harmonic tremor (10 minutes), explosions, and volcano-tectonic earthquakes (maximum magnitude 2.1 at 0044 on 13 July). Ash plumes identified in webcam and satellite images were described in daily aviation notices issued by the Washington VAAC; some plumes rose as high as 1.6 km above the summit and drifted SW, W, or NW. Minor explosions occurred at 1739 on 11 July. Moderate explosions were recorded at 2154 and 2345 on 11 July and at 0316 and 0343 on 12 July. During 11-12 July ashfall was reported in the municipalities of Atlautla (10 km W), Tepetlixpa (23 km W), Calimaya (108 km W), Ayapango (24 km WNW), Tenango del Aire (29 km WNW), Juchitepec (30 km WNW), Chapultepec (100 km WNW), Amecameca (15 km NW), Temamatla (33 km NW), Cocotitlán (34 km NW), Valle de Chalco (44 km NW), La Paz (51 km NW), Nezahualcóyotl (60 km NW), Ixtapaluca (60 km NNW) in the state of Mexico. In Mexico City, ashfall was reported in Milpa Alta (46 km WNW), Tlalpan (67 km WNW), Tláhuac (49 km NW), Iztapalapa (59 km NW). During 12-13 July ashfall was reported in Valle de Chalco, Ixtapaluca, La Paz, Nezahualcóyotl, Amecameca, Atlautla, Ayapango, Cocotitlán, Temamatla, Tepetlixpa, Tenango del Aire, Juchitepec, Chapultepec and Calimaya, as well as in the municipalities of Milpa Alta, Tláhuac, Iztapalapa and Tlalpan of Mexico City. During 13-14 ashfall was reported in Valle de Chalco, Amecameca, Ayapango, Atlautla and Tenango del Aire. The Alert Level remained at Yellow, Phase Two (the middle level on a three-color scale) and the public was warned to stay 12 km away from the crater.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC), Secretaría de Gestión Integral de Riesgos y Protección Civil (SGIRPC)
Report for Sabancaya
Instituto Geofísico del Perú (IGP) reported moderate levels of activity at Sabancaya during 10-16 July with a daily average of 23 explosions. Gas-and-ash plumes rose as high as 2.5 km above the summit and drifted NE, E, and SE. Nine thermal anomalies from the lava dome in the summit crater were detected using satellite data. Minor inflation was detected near the Hualca Hualca sector (4 km N). The Alert Level remained at Orange (the second highest level on a four-color scale) and the public were warned to stay outside of a 12 km radius.
Source: Instituto Geofísico del Perú (IGP)
Report for Sheveluch
KVERT reported that the eruption at Sheveluch continued during 6-13 July. Intense fumarolic activity was visible at the active dome, and thermal anomalies were identified in satellite images during 9 and 12-13 July. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Taal
PHIVOLCS reported that a series of seven significant but shallow tremors were recorded at Taal by all 15 seismic stations of the Taal Volcano Network during 0609-0900 on 13 July. Most of the events were located SE of Taal Volcano Island (TVI). Infrared camera images of Main Crater lake indicated increased thermal output. The report noted that sulfur dioxide emissions had been elevated during the previous two weeks, averaging 5,866 tonnes/day (t/d) and peaking at 9,623 t/d on 6 July. Upwelling gasses and fluids in the lake were periodically visible. Electronic tilt data indicated inflation at the N flank of TVI since May 2023.

During 11-18 July there were 2-16 daily volcanic earthquakes including 1-13 periods of volcanic tremor (each lasting 1-5 minutes long); a period of tremor that began at 1210 on 16 July was ongoing through 17 July. Upwelling gasses and fluids in the lake were visible on a few of the days; vog was reported around the caldera during 11-12 July. Daily emissions of gas-and-steam rose 0.9-2.4 km and drifted SW, SE, NE, and NW. The Alert Level remained at 1 (on a scale of 0-5), and PHIVOLCS reminded the public that the entire Taal Volcano Island was a Permanent Danger Zone (PDZ).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Takawangha
AVO reported that earthquake activity near Takawangha had decreased in both rate and magnitude. The rate of earthquakes had been about three events per day during the previous three weeks, much lower than the 150 events per day recorded during the peak of the swarm in mid-March. Recent satellite images did not indicate any deformation on the island and no other signs of volcanic unrest had been detected. On 18 July the Volcano Alert Level was lowered to Normal (the lowest level on a four-level scale) and the Aviation Color Code was lowered to Green (the lowest color on a four-color scale).
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Tanaga
AVO reported that earthquake activity near Tanaga had decreased in both rate and magnitude. The rate of earthquakes had been about three events per day during the previous three weeks, much lower than the 150 events per day recorded during the peak of the swarm in mid-March. Recent satellite images did not indicate any deformation on the island and no other signs of volcanic unrest had been detected. On 18 July the Volcano Alert Level was lowered to Normal (the lowest level on a four-level scale) and the Aviation Color Code was lowered to Green (the lowest color on a four-color scale).
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Villarrica
POVI reported that incandescence from two vents on the floor of Villarrica’s summit crater was visible, reflected by gas-and-steam emissions, during the early morning (around 0336) of 12 July. At around 1551 on 13 July a series of gas-and-steam pulses that contained some ash that was deposited on the upper E flank. According to Corporación Ciudadana Red Nacional de Emergencia incandescence was also reflected by gas-and-steam plumes on 16 July. The Volcanic Alert level remained at Yellow (the second highest on a four-level scale) according to SERNAGEOMIN. SENAPRED maintained the Alert Level at Yellow (the middle level on a three-color scale) for the communities of Villarrica, Pucón (16 km N), Curarrehue, and Panguipulli, and SINAPRED maintained an exclusion zone of 500 m from the crater.
Sources: Proyecto Observación Villarrica Internet (POVI), Servicio Nacional de Geología y Minería (SERNAGEOMIN), Sistema y Servicio Nacional de Prevención y Repuesta Ante Desastres (SENAPRED), Corporación Ciudadana Red Nacional de Emergencia