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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 7 August-13 August 2024
Name Country Volcanic Province Eruption Start Date Report Status
Bezymianny Russia Eastern Kamchatka Volcanic Arc 2022 Mar 15 New
Whakaari/White Island New Zealand Taupo Volcanic Zone 2024 May 24 New
Aira Japan Ryukyu Volcanic Arc 2017 Mar 25 Continuing
Dempo Indonesia Sunda Volcanic Arc 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
Ijen Indonesia Sunda Volcanic Arc Continuing
Kanlaon Philippines Negros-Sulu Volcanic Arc Continuing
Karangetang Indonesia Sangihe Volcanic Arc Continuing
Karymsky Russia Eastern Kamchatka Volcanic Arc 2024 Jun 20 Continuing
Lewotobi Indonesia Sunda Volcanic Arc 2023 Dec 23 Continuing
Merapi Indonesia Sunda Volcanic Arc 2020 Dec 31 Continuing
Rincon de la Vieja Costa Rica Central America Volcanic Arc 2021 Jun 28 Continuing
Sabancaya Peru Central Andean Volcanic Arc 2016 Nov 6 Continuing
Semeru Indonesia Sunda Volcanic Arc 2017 Jun 6 Continuing
Sheveluch Russia Eastern Kamchatka Volcanic Arc 1999 Aug 15 Continuing
Suwanosejima Japan Ryukyu Volcanic Arc 2004 Oct 23 Continuing
Taal Philippines Taiwan-Luzon Volcanic Arc 2024 Apr 12 Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,697 individual reports over 1,246 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
 News Feeds and Google Placemarks


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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)

Report for Bezymianny
KVERT reported that a daily thermal anomaly over Bezymianny was identified in satellite images during 1-8 August. Plumes of resuspended ash drifted 90 km SE during 3-4 August. 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
GeoNet reported that a vigorous volcanic plume at Whakaari/White Island was identified in satellite and webcam images on 9 August with the most active period occurring during 1300-1500. The plume drifted E and contained a minor amount of ash, prompting GeoNet to raise the Volcanic Alert Level to 3 (on a scale of 0-5) and the Aviation Color Code to Orange (the second highest level on a four-color scale). Activity diminished later that day.

Emissions with low ash content began around 0000 on 11 August that drifted W and were continuous at least through 1015. The ash plume rose to 1-2 km a.s.l. and a steam plume rose to around 2 km a.s.l. Sulfur dioxide emissions were identified in satellite data for the first time during the current active period, which began in May. The satellite instrument is less sensitive than instruments used during gas observations flights, suggesting that sulfur dioxide emissions had increased. Low-level plumes containing minor amounts of ash continued to be identified in satellite images and images from webcams located in Whakatane and Te Kaha during 12-14 August. Weather occasionally prevented visual observations. GeoNet noted that sulfur dioxide emissions coupled with minor eruptive activity suggested that magma had ascended to shallow levels.
Source: GeoNet
Report for Aira
JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) characterized as explosions and eruptive events during 5-12 August. Nighttime crater incandescence was visible in webcam images. An explosion at 0037 on 6 August produced an ash plume that rose 3 km above the crater rim and drifted SW and ejected large blocks 1.3-1.7 km from the crater rim. A large amount of ash fell in Kagoshima City (about 10 km W) within an hour after the explosion. An explosion at 2137 generated an ash plume that rose 800 m above the crater rim before merging into weather clouds and ejected large blocks 800-1,100 m from the crater rim. An ash plume from an explosion at 1444 on 7 August rose 2.3 km above the crater rim and drifted S. Eruptive events at 0329 on 6 August, 1207 on 7 August, 2308 on 8 August, 1913 and 2239 on 9 August, and 0541 on 12 August produced ash plumes that rose 1.1-1.7 km above the crater rim and rose above the crater or drifted S and SE. 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 Dempo
According to a news article the public was reminded to stay 1 km away from Dempo’s main crater and as far as 2 km on the N flank because of potential eruptions and toxic gases. The crater lake was turquoise green on 5 August and gray on 8 August. The Alert Level remained at 2 (on a scale of 1-4).
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Antara News
Report for Dukono
PVMBG reported that the eruption at Dukono was ongoing during 7-13 August. Daily gray-and-white ash plumes rose 100-1,000 m above the summit and drifted SW, W, and NW. 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 1-8 August. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions during 4-6 and 8 August generated ash plumes that rose as high as 3.5 km (11,500 ft) a.s.l. and drifted E. Thermal anomalies were identified in satellite images on 5 August; on other days 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 in Great Sitkin’s summit crater continued during 6-13 August, particularly near the summit and to the ENE; continuing growth was confirmed by 6-7 August satellite images. Seismicity was low with few small daily earthquakes. Elevated surface temperatures were at moderate levels during 10-11 August and at weak levels during 11-13 August. Minor steaming and a diffuse gas plume were visible in webcam and satellites images during 11-13 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 7-13 August and multiple eruptive events were recorded daily. Gray or white-and-gray ash plumes that were sometimes dense rose as high as 1 km above the summit and drifted in multiple directions on most days; weather conditions occasionally obscured views, especially on 8 August. Daily webcam images posted with the reports showed incandescence emanating above the crater rim, possibly reflected in the emissions. 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 Ijen
PVMBG reported that after a period of elevated seismicity at Ijen during 12-22 July, the number and magnitude of seismic events began to decrease. Realtime Seismic Amplitude Measurement (RSAM) data showed that the intensity of the seismicity began to decline on 13 July and, although there were fluctuations, seismicity had almost returned to normal levels. Visual observations during 1-12 August indicated that the color of the lake was the usual turquoise green, gas bubbles were not visible, there were fewer sulfur spherules, and white steam was not rising from the surface of the lake. The temperature of the crater lake water was 42.2-43.4 degrees Celsius. Dense white solfatara plumes rose from vents. A sulfur odor was present, but it was not strong. The lake water was 15.3 m below the dam. At 1300 on 13 August the Alert level was lowered to 1 (on a scale of 1-4) and residents, visitors, and miners were advised to not approach the crater rim, go down inside the crater, or stay overnight within 500 m of the crater rim.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Kanlaon
PHIVOLCS issued a special notice for Kanlaon at 2330 on 10 August noting increased sulfur dioxide emissions. Earlier in the day a Flyspec instrument measured an average of 4,839 tonnes per day (t/d) of sulfur dioxide emissions at the summit crater, the third highest value recorded in 2024. Gas emissions rose 400-600 m above the carter rim and drifted SE and NE during 10-13 August. Another special notice was issued at 1830 on 13 August noting that the Flyspec instrument measured an average of 7,307 t/d, the highest sulfur dioxide emissions ever recorded at the volcano. Higher sulfur dioxide gas fluxes had been recorded in 2024 with an average of 1,273 t/d prior to the 3 June eruption; afterward the eruption emissions were elevated, averaging 3,102 t/d. An average of nine volcanic earthquakes per day also persisted after the 3 June eruption. Ground deformation data from continuous GPS and electronic tilt data indicated inflation of the volcano since March 2022 and specifically at the E flank starting in 2023. 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 Karangetang
PVMBG reported that heavy rain that began at noon on 7 August generated lahars at around 1230 and 1239 that descended Karangetang’s Nanitu, Timbelang, and Batuawang drainages on the W, SW, and S flanks, respectively. The lahar deposit in the Batuawang drainage varied between 5 cm and 1.5 m thickness and blocked a 150-m-long section of the Ondong-Ulu Siau Road. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 1.5 km away from both Main Crater and North Crater and 2.5 km away on the S and SE flanks.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Antara News
Report for Karymsky
KVERT reported moderate levels of activity at Karymsky during 1-8 August. A thermal anomaly over the volcano was identified in satellite images during 3-5 and 7 August; weather clouds obscured views on the other days during the week. 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 Lewotobi
PVMBG reported that eruptive activity at Lewotobi’s Laki-laki volcano continued during 7-13 August. 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. Eruptive events were sometimes recorded on other days but weather conditions prevented visual observations. Incandescence near the summit crater was visible in webcam images during 9-10 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 Merapi
BPPTKG reported that the eruption at Merapi (on Java) continued during 2-8 August. Earthquakes were less intense compared to the previous week. The SW lava dome produced 223 lava avalanches that traveled as far as 1.9 km down the upper part of the Bebeng drainage. Morphological changes to the SW lava dome were due to continuing effusion and collapses of material, and slight changes were detected at the dome in the main crater. The volume of the SW dome was an estimated 2,628,300 cubic meters and the dome in the main crater was stable at an estimated 2,360,700 cubic meters based on webcam images and a 2 August drone survey. The hottest temperature at the SW dome was around 249 degrees Celsius, higher than 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 Rincon de la Vieja
OVSICORI-UNA reported that steam-and-gas emissions at Rincón de la Vieja were continuous for a period of time starting the morning of 9 August before they intensified around 0800. At 1240 a small phreatic event produced a gas-and-steam plume that rose 700 m above the crater rim and drifted E. During 11-12 August seismicity was characterized by intermittent, low-intensity tremor and sporadic, long-period tornillo-type events. A small phreatic event was recorded at 0211 on 12 August.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Report for Sabancaya
Instituto Geofísico del Perú (IGP) reported that the eruption at Sabancaya continued during 5-11 August with a daily average of 48 explosions. Gas-and-ash plumes rose as high as 1.5 km above the summit and drifted less than 10 km S and SE. Thermal anomalies over the lava dome in the summit crater were identified in satellite data. Slight inflation was detected N of Hualca Hualca (7 km N). Sulfur dioxide emissions were at low levels, averaging 158 tons per day. The Alert Level remained at Orange (the third level on a four-color scale) and the public was warned to stay outside of a 12 km radius.
Source: Instituto Geofísico del Perú (IGP)
Report for Semeru
PVMBG reported that eruptive activity continued at Semeru during 7-13 August with multiple daily eruptive events recorded by the seismic network. White-and-gray ash plumes that were sometimes dense rose 400-800 m above the summit and drifted in multiple directions on most days; weather conditions sometimes prevented visual conformation of the eruptive events, especially on 8 and 13 August. 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 Sheveluch
KVERT reported that thermal anomalies over both the “300 years of RAS” dome on the SW flank of Old Sheveluch and the lava dome in the crater of Young Sheveluch were identified in satellite images during 2-6 August. Plumes of resuspended ash drifted 210 km SE during 3-5 August. 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 Suwanosejima
JMA reported that eruptive activity at Suwanosejima's Ontake Crater continued during 5-12 August. Crater incandescence was observed nightly in webcam images. Eruptive events were recorded at 2109 on 6 August, at 0056, 0124, 0236, 0313, 0349, 0657, and 0955 on 7 August, and at 0207, 1156, 1225, and 1440 on 8 August. Ash plumes rose 1-1.4 km above the crater rim and drifted mainly SW, S, and SE. Explosions were recorded at 1457, 1625, and 1717 on 10 August, though emissions were not visually observed. Explosions at 2103 on 10 August, at 1011 and 1213 on 11 August, and at 0054 and 0207 on 12 August generated ash plumes that rose 200-600 m above the crater rim and drifted SE; sometimes the plumes rose into weather clouds. 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 Taal
PHIVOLCS reported ongoing, low-level unrest at Taal during 6-13 August. Daily steam-and-gas plumes rose as high as 1.2 km above the crater rim and drifted NE and ENE. Four volcanic earthquakes were recorded during 6-7 August and a volcanic tremor signal lasting one minute occurred during 7-8 August . Sulfur dioxide emissions averaged 5,094 tonnes per day (t/d) on 8 August and 2,655 t/d on 12 August. Hot fluids were visible upwelling in the lake during 10-13 August. A one-minute phreatic event was detected during 11-12 August. 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) and to take extra precautions around Main Crater, when boating on Taal Lake, and along the Daang Kastila fissure.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)