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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 4 August-10 August 2021
Name Location Eruption Start Date Report Status
Chirinkotan Kuril Islands (Russia) New
Great Sitkin Andreanof Islands (USA) 2021 May 25 New
Nyiragongo DR Congo 2002 May 17 (?) New
Pacaya Guatemala New
Pagan Mariana Islands (USA) New
Pavlof United States 2021 Aug 5 New
Semisopochnoi Aleutian Islands (USA) 2021 Feb 2 ± 2 days New
Suwanosejima Ryukyu Islands (Japan) 2004 Oct 23 New
Tengger Caldera Eastern Java (Indonesia) New
Whakaari/White Island North Island (New Zealand) New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Asamayama Honshu (Japan) Continuing
Copahue Central Chile-Argentina border Continuing
Dukono Halmahera (Indonesia) 1933 Aug 13 Continuing
Ebeko Paramushir Island (Russia) Continuing
Etna Sicily (Italy) 2013 Sep 3 Continuing
Fuego Guatemala 2002 Jan 4 Continuing
Karymsky Eastern Kamchatka (Russia) 2020 Apr 1 Continuing
Lewotolok Lembata Island (Indonesia) 2020 Nov 27 Continuing
Merapi Central Java (Indonesia) 2020 Dec 31 Continuing
Popocatepetl Mexico 2005 Jan 9 Continuing
Raung Eastern Java (Indonesia) Continuing
Santa Maria Guatemala 1922 Jun 22 Continuing
Semeru Eastern Java (Indonesia) 2014 Apr 1 ± 15 days Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Sinabung Indonesia Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 17,388 individual reports over 1,098 weeks (average of 16 per week) on 315 different volcanoes.

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Agung Concepcion Ibu Little Sitkin Peuet Sague Spurr
Ahyi Copahue Ijen Llaima Pinatubo St. Helens
Aira Cotopaxi Iliamna Loihi Planchon-Peteroa Stromboli
Akan Cuicocha Iliwerung Lokon-Empung Poas Sulu Range
Alaid Cumbal Inielika Lopevi Popocatepetl Sumbing
Alu-Dalafilla Dabbahu Ioto Machin Puyehue-Cordon Caulle Sundoro
Ambae Davidof Irazu Makian Rabaul Suretamatai
Ambang Dempo Iya Makushin Raikoke Suwanosejima
Ambrym Descabezado Grande Izu-Torishima Maly Semyachik Ranakah Taal
Anatahan Dieng Volcanic Complex Jackson Segment Manam Raoul Island Tair, Jebel at
Aniakchak Dukono Kaba Manda Hararo Rasshua Takawangha
Antillanca Volcanic Complex Ebeko Kadovar Marapi Raung Talang
Antuco Ebulobo Kambalny Maroa Redoubt Tambora
Apoyeque Egon Kanaga Martin Reventador Tanaga
Arenal Ekarma Kanlaon Masaya Reykjanes Tandikat-Singgalang
Asamayama Epi Karangetang Maule, Laguna del Rincon de la Vieja Tangkoko-Duasudara
Askja Erebus Karkar Mauna Loa Rinjani Tangkuban Parahu
Asosan Erta Ale Karthala Mayon Ritter Island Tara, Batu
Atka Etna Karymsky McDonald Islands Rotorua Telica
Augustine Etorofu-Yakeyama [Grozny Group] Kasatochi Melimoyu Ruang Tenerife
Avachinsky Eyjafjallajokull Katla Merapi Ruapehu Tengger Caldera
Awu Fernandina Katmai Midagahara Ruiz, Nevado del Three Sisters
Axial Seamount Fogo Kavachi Misti, El Sabancaya Tinakula
Azul, Cerro Fonualei Kelimutu Miyakejima Sakar Tofua
Azumayama Fournaise, Piton de la Kelud Momotombo Salak Tokachidake
Bagana Fourpeaked Kerinci Monowai San Cristobal Tolbachik
Balbi Fuego Ketoi Montagu Island San Miguel Toliman
Bamus Fujisan Kharimkotan Moyorodake [Medvezhia] San Vicente Tongariro
Banda Api Fukutoku-Oka-no-Ba Kick 'em Jenny Mutnovsky Sangay Tungurahua
Bardarbunga Galeras Kikai Myojinsho Sangeang Api Turrialba
Barren Island Galunggung Kilauea Nabro Santa Ana Ubinas
Batur Gamalama Kirishimayama Negra, Sierra Santa Maria Ugashik-Peulik
Bezymianny Gamkonora Kizimen Negro, Cerro Sarigan Ukinrek Maars
Bogoslof Gareloi Klyuchevskoy Nightingale Island Sarychev Peak Ulawun
Brava Gaua Kolokol Group Nishinoshima Saunders Unnamed
Bristol Island Gorely Koryaksky Nisyros Savo Unnamed
Bulusan Great Sitkin Krakatau Novarupta Semeru Veniaminof
Calbuco Grimsvotn Krummel-Garbuna-Welcker NW Rota-1 Semisopochnoi Villarrica
Callaqui Guagua Pichincha Krysuvik-Trolladyngja Nyamulagira Seulawah Agam Vulcano
Cameroon Guallatiri Kuchinoerabujima Nyiragongo Sheveluch West Mata
Campi Flegrei del Mar di Sicilia Guntur Kurikomayama Okataina Shishaldin Westdahl
Cayambe Hachijojima Kusatsu-Shiranesan Okmok Simbo Whakaari/White Island
Chachadake [Tiatia] Hakoneyama Kverkfjoll Ontakesan Sinabung Witori
Chaiten Heard La Palma Oraefajokull Sinarka Wolf
Chiginagak Hekla Lamington Osorno Siple Yasur
Chikurachki Helgrindur Lamongan Pacaya Sirung Zaozan [Zaosan]
Chiles-Cerro Negro Hierro Langila Pagan Slamet Zavodovski
Chillan, Nevados de Hokkaido-Komagatake Lanin Palena Volcanic Group Snaefellsjokull Zhupanovsky
Chirinkotan Home Reef Lascar Paluweh Soputan Zubair Group
Chirpoi Hood Lateiki Panarea Sorikmarapi
Ciremai Huaynaputina Lengai, Ol Doinyo Papandayan Sotara
Cleveland Hudson, Cerro Leroboleng Parker Soufriere Hills
Colima Huila, Nevado del Lewotobi Pavlof Soufriere St. Vincent
Colo Hunga Tonga-Hunga Ha'apai Lewotolok Pelee South Sarigan Seamount
 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 Chirinkotan
According to KVERT an explosion at Chirinkotan at 1745 on 8 August produced an ash plume that rose 2-2.7 km (6,600-9,000 ft) a.s.l. and drifted 86 km WSW and SW. KVERT raised the Aviation Color Code to Orange (the second highest level on a four-color scale). KVERT, SVERT, and the VAAC reported continuing ash-producing events through 10 August. Notably at 1915 on 9 August an ash cloud, 10 x 13 km in size, possibly rose as high as 3.7 km (12,000 ft) a.s.l. and drifted 26-30 km SSE and S. An explosive event at 0855 on 10 August produced an ash plume 11 x 14 km in size that rose 2-2.5 km (6,600-8,200 ft) a.s.l. and drifted 70 km W.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Sakhalin Volcanic Eruption Response Team (SVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Report for Great Sitkin
AVO reported that unrest continued at Great Sitkin during 4-10 August with elevated seismicity, elevated surface temperatures, and explosions associated with a growing lava dome. Numerous earthquakes and small explosions were recorded on local infrasound and seismic stations during 4-5 August. During the morning of 5 August observers reported possible low-level lava fountaining from the active vent; the activity was also visible from Adak Island. Throughout the same day a volcanic plume comprised mostly of gas and steam (and possibly ash) was visible in webcam images rising to 3 km (10,000 ft) a.s.l. By 6 August the lava dome had grown to 250 m in diameter and had an approximate volume of about 1 million cubic meters. AVO noted that most of the crater was full of lava erupted in 1974 and that the current lava covered only 4-5 percent of the total summit crater area. Elevated surface temperatures were identified in satellite images during 6-10 August, though weather clouds mostly prevented satellite and webcam views. The Aviation Color Code and the Volcano Alert Level remained at Orange and Watch, respectively.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Nyiragongo
Goma Volcano Observatory (GVO) reported that a gas-and-ash plume rose from Nyiragongo at 1420 on 4 August.
Source: Observatoire Volcanologique de Goma (OVG)
Report for Pacaya
INSIVUMEH reported that explosions at Pacaya were recorded at 0905, 1340, and 1421 on 4 August, a departure from the low levels of activity observed during the previous four months. The explosions produced ash plumes that rose about 1 km above the summit and drifted 12 km N, causing ashfall in Mesías Altas, Mesías Bajas, and Villa Canales. The report noted that the cinder cone in Mackenney Crater had been destroyed during the previous eruption phase and the crater was about 100 m deep. Cracks were seen around the crater indicating areas of instability at the summit. Steam-and-gas plumes rose as high as 1 km above the summit and drifted as far as 3 km in multiple directions during 5-10 August. No explosions were heard or visually observed, though the seismic network recorded weak explosion signals during 6-7 August.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Pagan
Felt earthquakes and minor emissions from Pagan were observed on 29 July. No additional activity had been reported by 6 August; the Aviation Color Code and the Volcano Alert Level remained at Yellow/Advisory, respectively. Seismic, infrasound, and web camera data from the volcano remained unavailable; no activity was observed in satellite images.
Source: US Geological Survey
Report for Pavlof
Intermittent bursts of ash from the summit of Pavlof were visible in webcam views on 5 August, prompting AVO to raise the Volcano Alert Level and Aviation Color Code to Watch and Orange, respectively. The bursts formed diffuse plumes that rose just above the summit and drifted almost 10 km SE before dissipating. Minor daily ash emissions continued to be observed in webcam images during 5-9 August. The seismic network recorded elevated seismicity (tremor) and small explosions. Several small explosions were recorded during 8-9 August though weather clouds prevented satellite and webcam views.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Semisopochnoi
AVO reported that an eruption at Semisopochnoi’s North Cerberus crater was ongoing during 4-10 August, characterized by daily explosions, ash plumes, and sulfur dioxide emissions identified in satellite images. Multiple energetic explosions were detected almost daily in seismic and infrasound data. An ash cloud rose to 1.5-3 km (5,000-10,000 ft) a.s.l. and drifted 33 km NE during 3-4 August. Ash emissions were also visible in webcam images and photographed by an observer S of the island. An ash cloud was generated at 2123 on 4 August and was visible in satellite data until 0250 on 5 August, drifting 180 km SE over Gareloi and southern Tanaga Island. A small ash cloud at 2040 on 6 August drifted 50 km beyond the N crater vent and quickly dissipated. Another small ash cloud at 2103 caused ashfall on the webcam located 5 km NE about 30 minutes later. Ash-and-steam emissions were visible in webcam images until 2333. A large infrasound signal was recorded at 0653 on 8 August, though weather conditions prevented visual confirmation of emissions. A possible small ash cloud was visible in a satellite image at 0700. At least three separate explosions were recorded at 1714 on 8 August and 0339 and 0417 on 9 August. A small ash cloud at 900 m (3,000 ft) a.s.l. was visible in satellite images on the morning of 9 August. There were 10 explosions recorded during 9-10 August; small ash-and-steam emissions were visible in the webcam and small low-level plumes were occasionally identified in satellite data. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Suwanosejima
JMA reported that 13 explosions at Suwanosejima's Ontake Crater produced eruption plumes that rose as high as 3.8 km above the crater rim during 30 July-6 August. Large volcanic bombs were ejected 500 m from the crater. Crater incandescence was visible nightly. The Alert Level remained at 2 and the public was warned to stay 1 km away from the crater.
Source: Japan Meteorological Agency (JMA)
Report for Tengger Caldera
PVMBG reported that during 3-9 August white steam-and-gas plumes rose as high as 400 m above Tengger Caldera’s Bromo cone and drifted NW, W, and SW. Thermal anomalies were visible in satellite images on 3 and 8 August; a weaker anomaly was also visible on 29 July. The Alert Level remained at 2 (on a scale of 1-4), and visitors were warned to stay outside of a 1-km radius of the crater.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Sentinel Hub
Report for Whakaari/White Island
GeoNet maintained the Volcanic Alert Level at 2 and the Aviation Color Code at Yellow for Whakaari/White Island based on continuing unrest and data collected during a recent overflight. In a 9 August report GeoNet noted that temperatures in the vent area remained high at 520 degrees Celsius; crater incandescence continued to be visible in webcams images at night. Moderate levels of carbon dioxide and sulfur dioxide emissions measured downwind of the volcano were similar to levels observed on 20 July. Low levels of ground deformation around the active vent and lake area were identified in satellite radar data. The interpretation of the data suggested a shallow magma intrusion beginning in June. Very steamy conditions obscured views of the vent area.
Source: GeoNet
Report for Aira
JMA reported that incandescence from Minamidake Crater (at Aira Caldera’s Sakurajima volcano) was visible at night during 2-9 August. Very small eruptive events were recorded during 2-6 August. The sulfur dioxide emission rate was relatively elevated at 1,500 tons per day on 4 August. The Alert Level remained at 3 (on a 5-level scale), and residents were warned to stay 2 km away from the crater.
Source: Japan Meteorological Agency (JMA)
Report for Asamayama
On 6 August JMA lowered the Alert Level for Asamayama to 1 (on a scale of 1-5), noting that the number of shallow volcanic earthquakes had been decreasing, sulfur dioxide gas emissions had been low, and deformation on the W flank had stabilized. JMA reminded the public to stay 500 m away from the crater.
Source: Japan Meteorological Agency (JMA)
Report for Copahue
SERNAGEOMIN and SEGEMAR reported increased activity at Copahue during 9-10 August, characterized as increased gas emissions, ash emissions, and crater incandescence. During the morning of 9 August gas-and-steam emissions increased and sulfur dioxide flux was as high as 7,200 tons per day. Crater incandescence was visible in nighttime webcam views and was intense during the early hours of 10 August. An ash plume rose 300 m above the crater rim and drifted N and NNW. Seismicity remained stable; data suggested no rising magma. The Alert Level remained at Green (the lowest level on a four-color scale).
Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Servicio Geológico Minero Argentino (SEGEMAR)
Report for Dukono
PVMBG reported that during 3-4 and 6 August white-and-gray ash plumes from Dukono rose 100-500 m above the summit and drifted E and W. Weather conditions prevented visual observations during 5 and 7-10 August. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Ebeko
According to volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 29 July, 1 August, and 3-5 August produced ash plumes that rose as high as 2.5 km (8,200 ft) a.s.l. and drifted S and SE. A thermal anomaly was identified in satellite images on 1 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Etna
INGV reported continuing activity at Etna’s summit craters during 2-8 August, mainly from the Northeast Crater (NEC) and the Southeast Crater (SEC). Gas emissions rose from Voragine Crater and from two active craters in Bocca Nuova. A series of discontinuous ash emissions from NEC began at 1350 on 4 August and lasted about two hours. An ash plume rose to 1.8 km (6,000 ft) a.s.l. and drifted NE. Similar but less intense ash emissions were visible on 5 August. The reddish mostly fine-grained material emitted from NEC was erupted when no thermal anomalies were present in the crater, suggesting that they were the result of landslides rather than eruptive activity. Strombolian activity began at SEC at 2057 on 7 August and was characterized by isolated explosions and the ejection of incandescent material beyond the crater rim; activity ceased during the night. An explosion at 2056 on 8 August was followed by the resumption of Strombolian activity at 0030 on 9 August. Incandescent material was again ejected beyond the crater rim and an ash plume drifted SE.
Source: Sezione di Catania - Osservatorio Etneo (INGV)
Report for Fuego
INSIVUMEH reported that 4-13 explosions per hour were recorded during 3-10 August at Fuego, generating ash plumes as high as 1.1 km above the crater rim and shock waves that often rattled buildings around the volcano. Ash plumes mostly drifted as far as 15 km W and SW, causing daily ashfall in several areas downwind, including Morelia (9 km SW), Panimaché (8 km SW), Santa Sofía (12 km SW), Yucales (12 km SW), El Porvenir (8 km ENE), Finca Palo Verde, Sangre de Cristo (8 km WSW), and San Pedro Yepocapa (8 km NW). Block avalanches descended the Ceniza (SSW), Seca (W), Trinidad (S), Taniluyá (SW), Las Lajas (SE), and Honda drainages, often reaching vegetated areas. Explosions ejected incandescent material 100-400 m above the summit during 4-6 and 9-10 August. At 1700 on 6 August a lahar descended the Las Lajas drainage, carrying fine material along with tree branches and blocks 1-2 m in diameter.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Karymsky
KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 29 and 31 July, and 1, 2, and 4 August. Weather clouds prevented satellite observations on the days in between as well as during 5-6 August. Gas, steam, and ash plumes from explosions rose 2.5 km (8,200 ft) a.s.l. and drifted 75 km SE during 1 and 4-5 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Lewotolok
PVMBG reported that the Strombolian eruption at Lewotolok continued during 3-10 August. Daily white, gray, and sometimes black plumes rose as high as 1.5 km above the summit and drifted in multiple directions. Banging noises associated with eruptions were reported almost daily. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 3 km away from the summit crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Merapi
BPPTKG reported that the lava dome just below Merapi’s SW rim and the lava dome in the summit crater both remained active during 30 July-5 August. The SW rim dome volume was an estimated 1.895 million cubic meters and about 3 m tall. A total of seven pyroclastic flows descended the SW flank as far as 2 km and as many as 84 lava avalanches traveled a maximum of 2 km SW. Multiple pyroclastic flows traveled 2-3 km down the SW flank on 8 August and ash plumes rose 1 km above the summit. According to a news article ashfall was reported in several local communities. Pyroclastic flows traveled up to 3 km down the SW flanks multiple times during 9-10 August. BNPB noted that a small fire on the SW flank, 2.5 km from the crater, was set by ejected incandescent material; the fire burned an area of only 30 square meters during 25-26 August. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 5 km away from the summit.
Sources: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG), Forbes
Report for Popocatepetl
CENAPRED reported that each day during 4-10 August there were 30-92 steam-and-gas emissions from Popocatépetl. The plumes drifted mainly W and some contained ash. A minor explosion was recorded at 0652 on 4 August. At 2137 on 6 August a moderately-sized explosion produced a plume, thought the height and drift direction were obscured by weather conditions. Incandescent fragments ejected from the crater were seen falling on the flanks not far from the crater rim. Weather conditions again prevented views of an explosion at 0258 on 8 August. The Alert Level remained at Yellow, Phase Two (middle level on a three-color scale).
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Report for Raung
PVMBG reported that neither explosive nor effusive activity had been recorded at Raung since February, and emissions were not observed during 1 July-8 August. Seismicity had declined and deformation data indicated a trend of deflation. The Alert Level was lowered to 1 (on a scale of 1-4) on 9 August, and the public was warned to stay away from the crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Santa Maria
INSIVUMEH reported that during 4-10 August daily explosions at Santa María’s Santiaguito lava-dome complex generated ash plumes that rose as high as 1 km above the summit and drifted as far as 7 km SW and W. Incandescence from the complex was occasionally visible at night. Collapses of blocky lava from Caliente dome sent avalanches down the S, SW, and W flanks, often reaching the base, and caused minor ashfall mostly on the volcano’s flank. Ashfall was also reported in San Marcos (8 km SW), Loma Linda Palajunoj (6 km WSW), and surrounding farms during 3-4 and 8-9 August. Heavy rainfall on 7 August caused a lahar to descend the Tambor River, carrying branches, tree trunks, and blocks up to 3 m in diameter.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Semeru
Semeru continued to erupt during 4-10 August. Inclement weather often prevented visual observations, though during 4-7 August avalanches of lava from the end of the flow in the summit crater were seen traveling 200 m SE down the Kobokan drainage. Gray-and-white plumes rose 500 m above the summit and drifted SW during 6-7 and 9 August. The Alert Level remained at 2 (on a scale of 1-4), with a general exclusion zone of 1 km and extensions to 5 km in the SSE sector.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Sheveluch
KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 30 July-6 August. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Sinabung
PVMBG reported that on most days during 3-10 August white gas-and-steam plumes from Sinabung rose as high as 500 m above the summit and drifted in multiple directions. Avalanches of lava traveled 500-700 m down the E and SE flanks during 4-7 August. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)