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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 14 August-20 August 2024
Name Country Volcanic Province Eruption Start Date Report Status
Etna Italy Sicily Volcanic Province 2022 Nov 27 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
Alaid Russia Kuril Volcanic Arc — Continuing
Dukono Indonesia Halmahera Volcanic Arc 1933 Aug 13 Continuing
Ebeko Russia Kuril Volcanic Arc 2022 Jun 11 Continuing
Fuego Guatemala Central America Volcanic Arc 2002 Jan 4 Continuing
Great Sitkin United States Aleutian Ridge Volcanic Arc 2021 May 25 Continuing
Ibu Indonesia Halmahera Volcanic Arc 2008 Apr 5 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
Nevado del Ruiz Colombia Northern Andean Volcanic Arc 2014 Nov 18 Continuing
Popocatepetl Mexico Trans-Mexican Volcanic Belt 2005 Jan 9 Continuing
Reventador Ecuador Northern Andean Volcanic Arc 2008 Jul 27 Continuing
Sangay Ecuador Northern Andean Volcanic Arc 2019 Mar 26 Continuing
Santa Maria Guatemala Central America Volcanic Arc 1922 Jun 22 Continuing
Semeru Indonesia Sunda Volcanic Arc 2017 Jun 6 Continuing
Stromboli Italy Aeolian Volcanic Arc 1934 Feb 2 Continuing
Suwanosejima Japan Ryukyu Volcanic Arc 2004 Oct 23 Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,792 individual reports over 1,251 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 Etna
INGV reported that activity at Etna’s summit craters continued during 12-18 August. Strombolian activity at Voragine Crater during 12-13 August ejected lava fragments that fell on the cone’s flanks. The seismic network recorded significant increases in tremor levels during 1700-2000 on 14 August and webcam images showed that Strombolian activity at Voragine Crater intensified. The Strombolian activity become lava fountaining by 0030 on 15 August and lava overflowed the W crater rim at Bocca Nuova Crater. Ash plumes at the peak of the activity rose as high as 9.5 km a.s.l. (about 6.2 km above the summit) and drifted SSW and ESE. Tephra fell in several areas including Belpasso, Pedara, Nicolosi, Ragalna, Mascalucia, Tremestieri Etneo, Gravina di Catania, Catania, Viagrande, Milo, Zafferana, Santa Tecla, Giarre, Santa Venerina Aci Bonaccorso, and Syracuse. According to a news article the Aeroporto de Catania (also called the Catania-Fontanarossa Airport) closed due to ashfall on the runways, with flights either being canceled, rescheduled, or diverted to other airports. The lava fountaining began to decrease at around 0230 and ceased at 0320. A two-minute-long explosion was recorded at 0328 and was followed by moderate level of Strombolian activity that gradually decreased. During a field inspection on 15 August scientists observed the new lava flows and noted that they overlapped the 4 August flows and descended farther SW. Lava from the fountaining event continued to fill in Bocca Nuova Crater and partially filled in NE Crater.

Two explosion sequences at Bocca Nuova Crater were recorded at 0430 and 0459 on 18 August and lasted four and six minutes, respectively. The explosions produced eruptive clouds that drifted ENE and rapidly dissipated. The explosions may have reopened the N vent because a thermal anomaly and almost continuous gas emissions from Bocca Nuova followed the events. Strombolian activity at Voragine Crater was also observed on 18 August.
Sources: Sezione di Catania - Osservatorio Etneo (INGV), Euronews
Report for Sheveluch
KVERT reported that thermal anomalies at Sheveluch, 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 8-15 August.

An explosive eruption at the “300 years of RAS” dome began at 1145 on 17 August and generated ash plumes that rose as high as 9 km (30,000 ft) a.s.l. by 1200, about 5.7 km above the summit. Both the Institute of Volcanology and Seismology, Far Eastern Branch, Russian Academy of Sciences (IVS FEB RAS) and the Kamchatka Volcanological Station reported that two vents on the W flank were active and producing ash plumes. Lightning strikes occurred within the ash plumes. Ashfall was reported in Ust'-Kamchatsk (100 km SE) and by 1550 the plumes had drifted 492 km SE. KVERT raised the Aviation Color Code to Red (the highest level on a four-color scale) at 2040. Incandescence from the vents was visible at night.

Explosive activity persisted, producing ash plumes to lower altitudes, or as high as 5 km (16,400 ft) a.s.l., at least through 0553 on 18 August. The plumes drifted SE and ESE and had drifted as far as 1,520 km. By 1920 the leading edge of a 1,900-km-long ash cloud was 2,400 km from the volcano. At 2033 the Aviation Color Code was lowered to Orange. KVERT noted that although the explosive phase had likely ended, extrusion from two vents near the “300 years of RAS” dome was ongoing; one of the vents was likely new.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Kamchatka Volcanological Station, Institute of Volcanology and Seismology (IVS) of the Far Eastern Branch of the Russian Academy of Sciences (FEB RAS)
Report for Whakaari/White Island
On 16 August GeoNet reported that a modest increase in ash content of emissions at Whakaari/White Island began on 9 August, based on satellite data. The gas-and-ash plumes rose as high as 2 km above the vent and drifted tens of kilometers from the island. Higher concentrations of volcanic gas emissions were detected during a 14 August gas observation overflight compared to the last overflight on 18 July. The emissions rose from a new vent that was 10-15 m in diameter and contained minor amounts of ash. Analysis of an ash sample collected during the overflight indicated a shallow magma source; the recent data confirmed that eruptive activity had changed around the beginning of August. The Volcanic Alert Level remained at 3 (on a scale of 0-5) and the Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: GeoNet
Report for Aira
JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 12-19 August. Nighttime crater incandescence was visible in webcam images. An eruptive event at 0541 on 12 August produced an ash plume that rose 1.5 km above the crater rim. Sulfur dioxide emissions were somewhat high, averaging 1,500 tons per day (t/d) on 14 August. An ash plume from an eruptive event at 1831 on 18 August rose 1.1 km above the crater rim and drifted NW. 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 Alaid
Although Alaid was not erupting, KVERT issued a Volcano Observatory Notice for Aviation (VONA) at 0307 on 16 August raising the Aviation Color Code to Orange (the second highest level on a four-color scale) to warn pilots of ash. Satellite images showed a plume of ash, that had been resuspend from the S flank, drifting 45 km SSE at altitudes of 2.5-3 km (8,200-10,000 ft) a.s.l. The Aviation Color Code was lowered back to Green at 0545 that same day. Dates are based on UTC times; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Dukono
PVMBG reported that the eruption at Dukono was ongoing during 14-20 August. Gray-and-white ash plumes that were sometimes dense rose 100-1,000 m above the summit and drifted SW and W on most days; white plumes rose 200-400 m above the summit and drifted W on 15 August, and no emissions were observed on 20 August. 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 8-15 August. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions during 14-15 August generated ash plumes that rose as high as 3.5 km (11,500 ft) a.s.l. and drifted SE. On other days either no activity was observed in satellite images 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 Fuego
INSIVUMEH reported that eruptive activity continued at Fuego during 13-20 August. Daily explosions were recorded by the seismic network, averaging 3-11 per hour. The explosions generated gas-and-ash plumes that rose as high as 1.1 km above the crater rim and drifted as far as 30 km NW, W, and SW. The explosions ejected incandescent material 50-300 m above the summit on most days and produced avalanches of material that descended the flanks, sometimes reaching vegetated areas. Weak rumbling sounds were reported on most days. Ashfall was reported on a few of the days in areas downwind including Panimaché I and II (8 km SW) Finca Palo Verde (10 km SW), El Porvenir (10 km S), Santa Sofia (12 km SW), Sangre de Cristo (10 km SW), Morelia (10 km SW), Los Yucales (12 km SW), Yepocápa (8 km NW), and other nearby communities. Ashfall was forecast for areas downwind on some of the other days. During the afternoon of 18 August lahars descended the Seca, Mineral, Ceniza, and Zarco drainages, carrying tree branches, trunks, and blocks as large as 1.5 m in diameter.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Great Sitkin
AVO reported that slow lava effusion in Great Sitkin’s summit crater continued during 13-20 August. Seismicity was low with few small daily earthquakes. Slightly elevated surface temperatures were identified in partly cloudy satellite views during 18-19 August. Weather clouds often 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 activity at Ibu continued during 14-20 August with multiple eruptive events recorded daily. Daily gray or white-and-gray ash plumes that were sometimes dense rose as high as 1.5 km above the summit and drifted N, NW, W, and SW. Some webcam images posted with the reports showed incandescence emanating above the crater rim, possibly reflected in the emissions. At 0252 an ash plume rose as high as 5 km above the crater rim and drifted 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 Karymsky
KVERT reported moderate levels of activity at Karymsky during 8-15 August. A thermal anomaly over the volcano was identified in satellite images during 10-11 and 13-14 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 14-20 August. Daily gray or white-and-gray ash plumes that were sometimes dense rose as high as 1.5 km above the summit and drifted mainly SW, W, and NW. Incandescence near the summit crater was visible in a 14 August webcam image. 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 9-15 August. Earthquakes were around the same intensity compared to the previous week. The SW lava dome produced 289 lava avalanches that traveled as far as 1.9 km SW down the upper part of the Bebeng drainage, one that traveled 1 km S down the Boyong drainage, and one that traveled 1.5 km W down the Batang drainage. Morphological changes to the SW lava dome were due to continuing effusion and 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 Nevado del Ruiz
Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that eruptive activity at Nevado del Ruiz continued during 13-19 August. The number of seismic events associated with fluid movement increased in both magnitude and number compared to the previous week but were variable throughout the week. Through webcams several ash emissions associated with these events were confirmed along with the occasional ejection of hotter material. Ashfall was reported in the municipalities of Villamaría (28 km NW) and Manizales (28 km NW), especially during 17-18 August. Seismicity associated with rock fracturing decreased in both the number of events and their magnitudes compared to the previous week; these earthquakes, with depths ranging from less than 1 km down to 8 km below the summit, were primarily located beneath the NW, ESE, and SE flanks of Arenas Crater and within 8 km N and NE of the crater. The largest event was an M 1 which was detected at 1747 on 13 August and located about 8 km ESE and 5 km deep. Sulfur dioxide emissions were variable, and gas plumes rose as high as 1.2 km above the crater rim and drifted NW, W, and WSW. Thermal anomalies on the crater floor were identified in satellite data, though weather conditions often obscured views. The Alert Level remained at Yellow (the second level on a four-level scale), and the public was warned to stay out of the restricted areas around Arenas Crater, not to spend long periods of time on the Murillo-Cerro Gualí Road, and to avoid drainages in the high-threat zones.
Source: Servicio Geológico Colombiano (SGC)
Report for Popocatepetl
CENAPRED reported that eruptive activity continued at Popocatépetl during 13-20 August. The seismic network recorded 25-105 long-period events per day that were accompanied by steam-and-gas emissions which sometimes contained minor amounts of ash. The seismic network also recorded daily periods of tremor as short as nine and a half minutes to as long almost two hours. During 13-15 and 18-19 August there were a few periods, 32-59 minutes long, of continuous emissions. Three volcano-tectonic earthquakes were recorded during 16-17 August. According to the Washington VAAC gas plumes with mostly low ash content were identified in both webcam and satellite images during 13-15 and 17 August and rose to 6.1-6.7 km (20,000-22,000 ft) a.s.l. (or as high as 1.3 km above the crater rim) and drifted N, NW, W, and SW. A thermal anaonly was identified in a satellite at 0951 on 14 August. 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)
Report for Reventador
IG-EPN reported that an eruption at Reventador was ongoing during 13-20 August. Seismicity was characterized by 43-100 daily explosions on most days, along with long-period earthquakes, harmonic tremor, and tremor associated with emissions during the beginning of the week; data transmissions from the seismic station were occasionally interrupted. Several ash-and-gas plumes were observed on most days rising 300-800 m above the crater rim and drifting N, WNW, and W. Weather conditions occasionally prevented visual observations, particularly on 16 August. Thermal anomalies in the crater were identified in satellite images on most days. Secretaría de Gestión de Riesgos maintained the Alert Level at Orange (the second highest level on a four-color scale).
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Secretaría de Gestión de Riesgos (SGR)
Report for Sangay
IG-EPN reported that high levels of eruptive activity continued at Sangay during 13-20 August and the seismic network recorded 189-273 daily explosions. Daily gas-and-ash plumes were visible in webcam and/or satellite images and rose 500-2,000 m above the summit and drifted mainly WNW, W, WSW, and SW. Weather conditions sometimes obscured views. Incandescent material at the summit crater was periodically visible at dark hours during most of week. During 17-19 August there were several episodes of incandescent material being ejected 1 km above the summit and descending the SE drainage as far as 500 m. Secretaría de Gestión de Riesgos (SGR) maintained the Alert Level at Yellow (the second highest level on a four-color scale).
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Secretaría de Gestión de Riesgos (SGR)
Report for Santa Maria
Instituto Nacional de Sismología, Vulcanologia, Meteorologia e Hidrología (INSIVUMEH) reported that high-level eruptive activity continued at Santa Maria’s Santiaguito lava-dome complex during 13-20 August with lava extrusion, block collapses, and avalanches at the Caliente dome complex. The continuous effusion of blocky lava produced block avalanches on the dome’s flanks and occasional short-range pyroclastic flows that descended multiple flanks. Accumulated material formed a promontory upslope of the 2022 lava flows in the Zanjón Seco (SW) and San Isidro (W) drainages. During most nights and early mornings incandescence was visible around Caliente dome. Daily explosions generated gas-and-ash plumes that rose 700-900 m above the summit and drifted mainly NW, W, and SW. Ashfall was reported in areas downwind includinh Monte Claro (S) during 14-15 August and in San Marcos (8 km SW) and Loma Linda Palajunoj (7 km SW) during 18-19 August. On 18 August a lahar descended the Tambor river in the SSW sector of the volcano carrying sediment, tree trunks, branches, and volcanic blocks up to 1 m in diameter. The lahar was hot and had a sulfur odor.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Semeru
PVMBG reported that eruptive activity continued at Semeru during 14-20 August with multiple daily eruptive events recorded by the seismic network. White-and-gray ash plumes that were sometimes dense rose 300-800 m above the summit and drifted in multiple directions on most days; weather conditions sometimes prevented visual confirmation of the eruptive events, especially on 17 and 21 August. Incandescence at the summit was sometimes visible in webcam images posted with the daily reports. 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 Stromboli
INGV reported that eruptive activity continued at Stromboli during 12-18 August. 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 variable-intensity explosive activity ejected coarse material (bombs and lapilli) at a low rate. Spattering occurred at the southernmost vent in Area N. Coincident with a peak in spattering activity at Area N at 1845 on 15 August lava began to overflow the crater and rapidly descended the Sciara del Fuoco. The lava flow was active for about three hours and followed a drainage formed during activity in July, reaching around 450 m elevation. The flow was no longer active at 2210 and began to cool.
Source: Sezione di Catania - Osservatorio Etneo (INGV)
Report for Suwanosejima
JMA reported that eruptive activity at Suwanosejima's Ontake Crater continued during 12-19 August. Crater incandescence was observed nightly in webcam images. Explosions at 0054 and 0207 on 12 August generated ash plumes that rose 400-600 m above the crater rim and drifted SE. Eruptive events were recorded at 2345 on 12 August, at 0432 on 13 August, at 1559, 1825, 1844, 2018, 2040, 2043, 2337, and 2356 on 15 August, at 0124, 0719, 1351, 1718, 1808, 2037, and 2336 on 16 August, and at 0147 on 17 August. Ash plumes from the events rose 1-1.6 km above the crater rim, sometimes drifting NE, N, NW, and W. 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)