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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 28 August-3 September 2024
Name Country Volcanic Province Eruption Start Date Report Status
Karymsky Russia Eastern Kamchatka Volcanic Arc 2024 Jun 20 New
Kikai Japan Ryukyu Volcanic Arc — New
Klyuchevskoy Russia Eastern Kamchatka Volcanic Arc — New
Reykjanes Iceland Iceland Neovolcanic Rift Volcanic Province — New
Sheveluch Russia Eastern Kamchatka Volcanic Arc 1999 Aug 15 New
Whakaari/White Island New Zealand Taupo Volcanic Zone 2024 May 24 New
Aira Japan Ryukyu Volcanic Arc 2017 Mar 25 Continuing
Dukono Indonesia Halmahera Volcanic Arc 1933 Aug 13 Continuing
Ebeko Russia Kuril Volcanic Arc 2022 Jun 11 Continuing
Great Sitkin United States Aleutian Ridge Volcanic Arc 2021 May 25 Continuing
Ibu Indonesia Halmahera Volcanic Arc 2008 Apr 5 Continuing
Kanlaon Philippines Negros-Sulu Volcanic Arc — Continuing
Lewotobi Indonesia Sunda Volcanic Arc 2023 Dec 23 Continuing
Marapi Indonesia Sunda Volcanic Arc 2023 Dec 3 Continuing
Merapi Indonesia Sunda Volcanic Arc 2020 Dec 31 Continuing
Nyamulagira DR Congo Albertine Rift Volcanic Province 2018 Apr 18 Continuing
Semeru Indonesia Sunda Volcanic Arc 2017 Jun 6 Continuing
Shishaldin United States Aleutian Ridge Volcanic Arc — Continuing
Stromboli Italy Aeolian Volcanic Arc 1934 Feb 2 Continuing
Suwanosejima Japan Ryukyu Volcanic Arc 2004 Oct 23 Continuing
Yasur Vanuatu Vanuatu Volcanic Arc 1270 ± 110 years Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,627 individual reports over 1,243 weeks (average of 17 per week) on 338 different volcanoes.

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

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Report for Karymsky
KVERT reported moderate levels of activity at Karymsky during 22-29 August. A weak thermal anomaly over the volcano was identified in satellite images during 26 and 28-29 August; weather clouds obscured views on the other days during the week. A series of six significant explosions beginning at 0810 on 30 August generated ash plumes that rose as high as 10 km (32,800 ft) a.s.l. and drifted NW, SE, and ENE. The Aviation Color Code was raised to Red (the highest level on a four-color scale). Pilots observed ash plumes rising 6-7 km (19,700-23,000 ft) a.s.l. and drifting ENE. At 0923 the Aviation Color Code was lowered to Orange. Dates are based on UTC times; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kikai
JMA reported that an eruptive event at Iodake Crater located at Satsuma Iwo-jima, a subaerial part of Kikai’s NW caldera rim, was recorded at 1128 on 1 September. An ash plume rose 1 km above the crater rim. The report noted that there was no change in the number of earthquakes either before or after the event, and no volcanic tremors were recorded. An eruptive event at 1008 on 3 September generated a volcanic plume that rose 700 m above the crater rim. Crater incandescence continued to be observed at night. The 1 September event was the first eruptive activity since 6 October 2020. The Alert Level remained at 2 (on a 5-level scale), and residents were warned to stay 500 m away from Iodake Crater.
Source: Japan Meteorological Agency (JMA)
Report for Klyuchevskoy
A sudden increase in seismicity at Klyuchevskoy during 1-3 September prompted KVERT to raise the Aviation Color Code to Yellow (the second lowest level on a four-color scale) at 0822 on 4 September. Dates and times are in UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Reykjanes
IMO reported that the eruption between Stóra-Skógfell and Sundhnúkur, within the Reykanes volcanic system, continued at the N end of the fissure during 27 August-3 September. By 29 August vigorous lava fountaining was concentrated at two main vents, though over the rest of the week the intensity of the eruption decreased. Lava slowly flowed mainly NW and to a lesser extent to the E. Subsidence was detected during the first part of the week; no deformation recorded during the second half of the week, suggesting that the rate of magma accumulation area under Svartsengi was similar to the rate of surface lava effusion. Plumes of sulfur dioxide gas from the eruption and smoke from vegetation fires started by lava caused significant pollution in areas downwind. According to Almannavarnadeild ríkislögreglustjóra, notable levels of sulfur dioxide gas concentrations (1,000 micrograms per cubic meter) were measured in Vogar on Vatnsleysustrand along the N coast on 30 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Sources: Icelandic Meteorological Office (IMO), Almannavarnadeild ríkislögreglustjóra (National Commissioner of the Icelandic Police and Department of Civil Protection and Emergency Management)
Report for Sheveluch
KVERT reported that during 22 August-1 September lava extrusion likely continued at Sheveluch’s “300 years of RAS” dome on the SW flank of Old Sheveluch and at a new vent or dome that formed during the 17-18 August explosive events. Thermal anomalies over the domes were identified in satellite images during 23, 26-27, and 29 August. Resuspended ash drifted 570 km SE during 28-29 August based on satellite images. Strong explosions at 1115 on 1 September generated ash plumes that rose as high as 8 km (26,200 ft) a.s.l. and drifted NE. By 2130 the ash cloud was about 340 km long and the leading E edge of the plume was about 770 km from the volcano. Explosive activity continued during 1-2 September. On 2 September ash plumes rose 3.5-4.5 km (11,500-14,800 ft) a.s.l. 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 Whakaari/White Island
The Wellington VAAC reported ongoing low-level, continuous emissions from Whakaari/White Island during 28 August-3 September based on satellite data, pilot observations, webcam views, and weather models. The plumes rose 0.9-1.5 km (3,000-5,000 ft) a.s.l. and drifted E and SE, though during the first part of the week they were often obscured by weather clouds. On 2 September ash plumes were visible above the weather clouds and ash was present in the plumes at multiple altitudes.
Source: Wellington Volcanic Ash Advisory Center (VAAC)
Report for Aira
JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 26 August-2 September. Nighttime crater incandescence was visible in webcam images on most days during dark hours, though weather clouds prevented views during 28-30 August. During a field visit on 27 August sulfur dioxide emissions averaged 1,500 tons per day, slightly higher than the average value. At 1358 on 1 September an ash plume rose as high as 1.2 km above the crater rim and drifted N. Emissions were continuous until 1510 that same day, generating ash plumes that rose 1 km above the crater rim and drifted N. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 1 km away from both craters.
Source: Japan Meteorological Agency (JMA)
Report for Dukono
PVMBG reported that the eruption at Dukono was ongoing during 28 August-3 September. Gray-and-white ash plumes that were sometimes dense rose 100-900 m above the summit and drifted E, NE, and W on most days; white plumes rose as high as 1 km above the summit and drifted E and NW on 29 August and 2 September. The Alert Level remained at Level 2 (on a scale of 1-4), and the public was warned to remain outside of the 3-km exclusion zone.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Ebeko
KVERT reported that moderate explosive activity was ongoing at Ebeko during 22-29 August. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions during 22 and 26-28 August generated ash plumes that rose as high as 2 km (6,600 ft) a.s.l. and drifted SE, NE, and NW. Satellite data indicated that either no activity was observed, or weather conditions prevented views. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Great Sitkin
AVO reported that slow lava effusion continued to feed a thick lava flow in Great Sitkin’s summit crater during 27 August-3 September. Seismicity was low with few small daily earthquakes. A satellite image on 29 August indicated that the flow advanced NE. Weakly elevated surface temperatures were detected in satellite data on 31 August. 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 activity at Ibu continued during 28 August-3 September with multiple eruptive events recorded daily. Daily gray or white-and-gray ash plumes that were sometimes dense generally rose as high as 1.5 km above the summit and drifted in multiple directions. Some webcam images posted with the reports showed incandescence visible above the crater rim. At 0118 on 28 August a dense gray-to-black ash plume rose as high as 5 km above the crater rim and drifted SW and W. The Alert Level remained at 3 (the second highest level on a four-level scale) and the public was advised to stay 4 km away from the active crater and 5 km away from the N crater wall opening.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Kanlaon
PHIVOLCS reported that unrest at Kanlaon continued during 27 August-3 September. There were 3-12 daily volcanic earthquakes recorded by the seismic network. Steam-and-gas emissions rose 100-500 m above the summit and drifted ENE, E, SW, and W on most days. Sulfur dioxide emissions declined during the week, averaging 4,585 (27 August), 4,418 (28 August), 3,189 (29 August), and 2,669 (31 August) tonnes per day. The Alert Level remained at 2 (on a scale of 0-5) and PHIVOLCS reminded the public to remain outside of the 4-km-radius Permanent Danger Zone.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Lewotobi
PVMBG reported that eruptive activity at Lewotobi’s Laki-laki volcano continued during 28 August-3 September. Daily gray or white-and-gray ash plumes that were sometimes dense rose as high as 1 km above the summit and drifted mainly SW, W, and NW; plumes drifted N and NE on 31 August. The Alert Level remained at 3 (the second highest level on a scale of 1-4) and the public was warned to stay outside of the exclusion zone, defined as a 3 km radius around both Laki-laki and Perempuan craters, 4 km to the NNW and SSE of Laki-laki.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Marapi
PVMBG reported that eruptive activity at Marapi (on Sumatra) was ongoing during 28 August-3 September. On 30 August and 3 September white emissions rose 200-300 m above the summit and drifted N, E, and SE. At 0823 on 31 August a dense white-and-gray ash plume rose 400 m above the summit and drifted N. Emissions were not reported on the other days of the week. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay 3 km away from the active 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 23-29 August. Earthquakes were less intense compared to the previous week. The SW lava dome produced lava avalanches that descended the S and SW flanks; 327 traveled as far as 2 km SW down the upper part of the Sat/Putih drainage and two traveled as far as 1.3 km S down the Boyong drainage. Eight pyroclastic flows descended the Bebeng drainage as far as 1.5 km. Morphological changes to the SW lava dome were due to continuing effusion and collapses of material. The hottest temperature was around 243 degrees Celsius on 25 August, similar to the previous measurement. 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 Nyamulagira
In a 3 September satellite image of Nyamuragira part of the end of the lava flow on the WNW flank was visible through weather clouds in a small area about 5.8 km from the center of the caldera. The lava was incandescent, suggesting continued activity. Part of the flow on the NNW flank was visible through the clouds in an area about 3.6 km from the center of the caldera, but it appeared black and was likely cooling.
Source: Copernicus
Report for Semeru
PVMBG reported that eruptive activity continued at Semeru during 28 August-3 September with multiple daily eruptive events recorded by the seismic network. White-and-gray or gray ash plumes that were sometimes dense rose 200-1,000 m above the summit and drifted in multiple directions on most days; weather conditions sometimes prevented visual confirmation of the eruptive events, especially on 1 and 3 September. Crater incandescence was sometimes visible in webcam images. The Alert Level remained at 2 (the second lowest level on a scale of 1-4). The public was warned to stay at least 5 km away from the summit in all directions, 13 km from the summit to the SE, 500 m from the banks of the Kobokan drainage as far as 17 km from the summit, and to avoid other drainages including the Bang, Kembar, and Sat, due to lahar, avalanche, and pyroclastic flow hazards.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Shishaldin
AVO reported that volcanic unrest at Shishaldin declined over the past several months. Slightly elevated seismicity, small infrasound signals, and weak gas emissions persisted, but there were no signs of explosivity nor the presence of lava in the summit crater. AVO noted that the activity was at background levels, and at 0900 on 30 August 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 Stromboli
INGV reported that eruptive activity continued at Stromboli during 26 August-1 September. Webcam images showed Strombolian activity at three vents in Area N within the upper part of the Sciara del Fuoco and from one vent at S2 in Area C-S (South-Central Crater) on the crater terrace. The vents in Area N continued to produce explosions at a rate of 8-14 events per hour, ejecting lapilli and bombs 80-150 m above the vents. The third and southernmost vent ejected spatter more continuously and intensely compared to the previous week. Medium-intensity explosions at the vent in Area C-S ejected tephra over 250 m above the vent at a rate of 1-4 events per hour.

Following a period of intense spattering from a vent in Area N, a lava flow was visible at 0244 on 30 August quickly descending the Sciara del Fuoco; the lava supply had decreased by 0700. Intense spattering at the N vent in Area N was observed at 1232 and was followed by a second lava flow. The effusion rate was the highest in the early afternoon and by 2300 the supply was minimal. A third lava flow began at 0430 on 31 August and descended the Sciara del Fuoco, overlapping the previous flows. By 1000 the flow was not well fed and cooling. The lava flows were confined to the drainage along the Sciara del Fuoco, and only small amounts of lava reached the coastline. The Alert Level remained at Yellow (the second lowest level on a four-level scale).
Sources: Sezione di Catania - Osservatorio Etneo (INGV), Dipartimento della Protezione Civile
Report for Suwanosejima
JMA reported that eruptive activity at Suwanosejima's Ontake Crater continued during 26 August-2 September. Crater incandescence was observed nightly in webcam images. An explosion at 0056 on 1 September generated an ash plume that rose 1 km above the crater rim and drifted SE. Eruptive events at 0813 and 0917 on 1 September and at 0338 and 0416 on 2 September generated ash plumes that rose 1-1.1 km above the crater rim and drifted SE and N. Rumbling was heard at the Suwanosejima Branch Office in Toshima village (3.5 km SSW) on an unspecified date. The Alert Level remained at 2 (on a 5-level scale) and the public was warned to stay at least 1.5 km away from the crater.
Source: Japan Meteorological Agency (JMA)
Report for Yasur
On 29 August the Vanuatu Meteorology and Geohazards Department (VMGD) reported that activity at Yasur continued at a level of “major unrest,” as defined by the Alert Level 2 status (on a scale of 0-5). Recent visual observations, webcam mages, and photos taken in the field indicated that explosions continued, producing emissions of gas, steam, and/or ash. Gas emissions and thermal anomalies were identified in satellite images. The report warned that some of the explosions may eject material that falls in and around the crater. The public was reminded to not enter the restricted area within 600 m around the boundaries of the Permanent Exclusion Zone, defined by Danger Zone A on the hazard map.
Source: Vanuatu Meteorology and Geohazards Department (VMGD)