Logo link to homepage

Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 31 July-6 August 2024
Name Country Volcanic Province Eruption Start Date Report Status
Bezymianny Russia Eastern Kamchatka Volcanic Arc 2016 Dec 5 New
Etna Italy Sicily Volcanic Province 2022 Nov 27 New
Karymsky Russia Eastern Kamchatka Volcanic Arc 2024 Jun 20 New
Aira Japan Ryukyu Volcanic Arc 2017 Mar 25 Continuing
Dukono Indonesia Halmahera Volcanic Arc 1933 Aug 13 Continuing
Ebeko Russia Kuril Volcanic Arc 2022 Jun 11 Continuing
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
Lewotobi Indonesia Sunda Volcanic Arc 2023 Dec 23 Continuing
Merapi Indonesia Sunda Volcanic Arc 2020 Dec 31 Continuing
Popocatepetl Mexico Trans-Mexican Volcanic Belt 2005 Jan 9 Continuing
Santa Maria Guatemala Central America Volcanic Arc 1922 Jun 22 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
Tungurahua Ecuador Northern Andean Volcanic Arc Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,531 individual reports over 1,239 weeks (average of 17 per week) on 336 different volcanoes.

Search by Date



Use the dropdowns to choose the year and week for archived Weekly Reports.

Use the dropdowns to choose the year and week for archived Weekly Reports.          



Search by Volcano



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


Download Smithsonian / USGS Weekly Volcanic Activity Report Network RSS Feed

The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. At the end of each report is a list of the sources used. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. This feature was first made available on 5 March 2008.



Download Smithsonian / USGS Weekly Volcanic Activity Report Network CAP Feed

The CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management. They are similar in content to the RSS feed, but contain no active links.



Download Smithsonian/USGS Weekly Volcanic Activity Report Network Link Download Smithsonian / USGS Weekly Volcanic Activity Report Network Link

A Google Earth network link for the Weekly Volcanic Activity Report can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano profile page and to the complete Weekly Report for that week. This feature was first made available on 1 April 2009.

 Criteria & Disclaimers

Criteria



The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:

- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.

Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.

It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.

Disclaimers



1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are cover longer time periods and are more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.

2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.

3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.

4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.

5. USGS Disclaimer Statement for this Website:

Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.

Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL: https://volcano.si.edu/reports_weekly.cfm

 Acronyms and Abbreviations

a.s.l. - above sea level

AVO - Alaska Volcano Observatory

AVHRR - Advanced Very High Resolution Radiometer

CENAPRED - Centro Nacionale de Prevencion de Desastres (México)

CONRED - Coordinadora Nacional para la Reducción de Desastres

COSPEC - Correlation Spectrometer

CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation

CVO - Cascades Volcano Observatory (USGS)

GMS - Geostationary Meteorological Satellite

GOES - Geostationary Operational Environmental Satellite

GVO - Goma Volcano Observatory

GVP - Global Volcanism Program (Smithsonian Institution)

HVO - Hawaiian Volcano Observatory (USGS)

ICE - Instituto Costarricense de Electricidad (Costa Rica)

IG - Instituto Geofísico (Ecuador)

IGNS - Institute of Geological and Nuclear Sciences (New Zealand) - now GNS Science

INETER - Instituto Nicaragüense de Estudios Territoriales (Nicaragua)

INGEMMET - Instituto Geológical Minero y Metalúrgico (Peru)

INGEOMINAS - Instituto Colombiano de Geología y Minería (Colombia)

INGV-CT - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (Italy)

INSIVUMEH - Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia (Guatemala)

IRD - Institut de Recherche pour le Développement (France)

JMA - Japanese Meteorological Agency

KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department

KVERT - Kamchatkan Volcanic Eruption Response Team

M - magnitude

METEOSAT - Meteorological Satellite

MEVO - Mount Erebus Volcano Observatory

MODIS - Moderate Resolution Imaging Spectroradiometer

MVO - Montserrat Volcano Observatory

MWO - Meteorological Watch Office

NEIC - National Earthquake Information Center

NIED - National Research Institute for Earth Science and Disaster Prevention (Japan)

NOAA - National Oceanic and Atmospheric Administration

NOTAM - Notice to Airmen

OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)

OFDA - Office of US Foreign Disaster Assistance

ONEMI - Oficina Nacional de Emergencia - Ministerio del Interior (Chile)

OVPDLF - Observatoire Volcanologique du Piton de la Fournaise (France)

OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)

PHIVOLCS - Philippine Institute of Volcanology and Seismology (Philippines)

RSAM - Real-time Seismic Amplitude Measurement

RVO - Rabaul Volcano Observatory

SERNAGEOMIN - Servicio Nacional de Geologia y Mineria (Chile)

SIGMET - Significant Meteorological Information

SNET - Servicio Nacional de Estudios Territoriales (El Salvador)

SVERT - Sakhalin Volcanic Eruption Response Team (Russia)

USAID - US Agency for International Development

USGS - United States Geological Survey

UTC - Coordinated Universal Time

VAAC - Volcanic Ash Advisory Center

VAFTAD - Volcanic Ash Forecast Transport And Dispersion

VDAP - Volcano Disaster Assistance Program (USGS)

VHP - Volcano Hazards Program (USGS)

VRC - Volcano Research Center (Japan)

Report for Bezymianny
The Kamchatka Volcanic Eruption Response Team (KVERT) reported that the effusive eruption at Bezymianny continued during 25 July-1 August. A notable thermal anomaly was observed over the volcano in satellite imagery during the reporting period. The Aviation Color Code remained at Yellow (the second level on a four-color scale). Dates are reported in UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Etna
INGV reported that activity at Etna’s summit craters continued during 29 July-4 August. On 29 July ongoing Strombolian activity at the Voragine crater generated a small ash emission that quickly dispersed from the summit area. Around 0408 on 4 August the Strombolian activity at Voragine crater began to increase in intensity and frequency, with volcanic tremor amplitude reaching very high levels around 0430 and increasing further by 0520 when activity transitioned to lava fountains. At 0445 the Aviation Color Code was raised from Orange to Red, though the ash cloud height could not be estimated. The fountains produced an SO2-rich eruption plume that by 0542 had reached about 6.5 km above the summit (to about 10 km a.s.l.) and was drifting SE; significant tephra (ash and lapilli) fell towards the E, affecting areas such as Fleri (14 km SE), Fornazzo (10.5 km E), Zafferana (11 km SE), Milo (11 km ESE), Santa Venerina (14 km SE), Giarre (17 km E), Riposto (18 km E), Stazzo (20 km SE), Torre Archirafi (20 km E), San Giovanni La Punta (20 km SSE), Viagrande (17 km SE), Aci Sant'Antonio, Aci Catena (20 km SE), Aci Castello (23 km SE), Aci Trezza (23 km SE), and Acireale (20 km SE). An ash advisory at 1058 noted that a second plume with a high ash concentration had reached 6.2 km a.s.l., and both it and the higher plume were drifting SSE. The high tremor amplitude decreased after 0910, explosive activity decreased over the next few hours, and at 1318 the Aviation Color Code was lowered from Red to Orange, though there were still sporadic emissions with ashfall confined to the summit area. Operations at the Aeroporto de Catania were reduced to six arrivals per hour during part of this period of elevated activity. During the lava fountaining, INGV observers noted that lava from Voragine had completely filled the Bocca Nuova (BN) crater, resulting in lava overflows from its W rim. There was an also an active flow moving NW to an elevation of about 3,000 m, and a flow was present between the Voragine and BN craters.
Sources: Sezione di Catania - Osservatorio Etneo (INGV), Toulouse Volcanic Ash Advisory Centre (VAAC), Aeroporto di Catania
Report for Karymsky
The Kamchatka Volcanic Eruption Response Team (KVERT) reported that moderate levels of activity continued at Karymsky during 25 July-1 August. Satellite data analyzed by KVERT showed a thermal anomaly over the volcano during 27-28 and 30 July; weather clouds prevented observations in satellite images on the other days. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are reported in UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Aira
JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 29 July-6 August. Nighttime crater incandescence was visible in webcam images. An explosion at 1646 on 29 July generated an ash plume that rose 4.4 km above the crater, and large blocks were ejected about 1,400 m WNW from the crater. An eruption at 0559 on 3 August generated an ash plume that rose 1,500 m above the summit. On 6 August multiple explosions generated ash plumes that rose as high as 3,000 m above the crater and drifted SW. Large blocks were ejected 1,300-1,700 m WNW from the crater. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 1 km away from both craters.
Source: Japan Meteorological Agency (JMA)
Report for Dukono
PVMBG reported that the eruption at Dukono was ongoing during 31 July-6 August. White emissions rose 100-600 m above the summit and drifted W and NW on 31 July. Gray-and-white emissions rose 100-900 m above the summit and drifted SW, W, and NW during 2-6 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
The Kamchatka Volcanic Eruption Response Team (KVERT) reported that moderate explosive activity continued at Ebeko during 25 July-1 August. Webcam images captured explosions between 26 and 29 July, as well as on 1 August, which generated ash plumes that rose to 3 km a.s.l., drifting SE from 26 to 28 July and NE on 29 July and 1 August. A thermal anomaly was observed over the volcano on 26 July in satellite images analyzed by KVERT; weather clouds prevented views on the other days. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are reported in UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Fuego
Instituto Nacional de Sismología, Vulcanologia, Meteorologia e Hidrología (INSIVUMEH) reported that eruptive activity continued at Fuego during 31 July-6 August. Daily explosions were recorded by the seismic network, ranging from 2 to 10 explosions per hour. The explosions generated gas-and-ash plumes that rose as high as 4.8 km above the crater rim and drifted as far as 30 km SW and W. The explosions produced block avalanches that descended the Ceniza (SSW), Santa Teresa (W), Seca (W), Taniluyá (SW), and Las Lajas (SE) drainages. On most days the explosions also ejected incandescent material 100-300 m above the summit, which was observed at night and early morning. The activity was often accompanied by weak-to-moderate rumbling sounds, shock waves, and sounds similar to a turbine engine lasting a few minutes at a time. Ashfall was reported on 31 July and 1 August in areas downwind including Panimaché I and II (8 km SW), Finca Paloverde (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), and other nearby communities. Ashfall was forecast for areas downwind on some of the other days.
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 31 July-6 August. The continued growth of the active flow was confirmed by satellite. Seismicity was low with few small daily earthquakes and rockfall signals. Weakly elevated surface temperatures and steam emissions from the growing dome were occasionally visible. Weather clouds often obscured or partially 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
Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that explosive activity continued at Ibu during 31 July-6 August. Emissions were observed daily; white plumes rose as high as 700 m above the summit and gray plumes produced by explosion events rose as high as 1.5 km above the summit. Seismicity included harmonic tremor episodes, volcanic earthquakes, frequent gas emission signals, and 43-108 daily explosion events. Ashfall was reported at the Ibu Volcano Observation Post (9 km W) on 6 August. The Alert Level remained at 3 (the third 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 Lewotobi
Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Lewotobi Laki-laki continued during 31 July-6 August. Emissions were observed daily, with white and gray plumes reaching heights of 50 to 1,200 m above the crater rim. Seismicity included frequent gas emission signals, harmonic tremor episodes, volcanic earthquakes, rockfall events, low-frequency (LF) earthquakes, and 4-7 daily explosive events. The Alert Level remained at 3 (the third level on a four-level scale) 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 26 July-2 August. The SW lava dome generated 148 lava avalanches that traveled as far as 1.8 km down the upper part of the Bebeng drainage. One pyroclastic flow also traveled as far as 1 km down the Bebeng drainage. Ten times the lava avalanches were heard from the Kaliurang and Babadan observation posts. Morphological changes to the SW lava dome were due to continuing effusion and collapses of material, but the dome at the main crater remained mostly unchanged. The volume estimates of the two domes did not change from the previous week at 2,538,700 cubic meters (SW dome) and 2,360,700 cubic meters (main dome). The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location.
Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)
Report for Popocatepetl
Centro Nacional de Prevención de Desastres (CENAPRED) reported that eruptive activity continued at Popocatépetl during 30 July-6 August. Daily activity consisted of 30-90 long-period (LP) events that were accompanied by emissions of gas, steam, and sometimes small quantities of ash. A total of 16 minutes of high-frequency, very low-amplitude tremor was registered during 30-31 July, and 169 minutes (approximately 2.8 hours) of harmonic, very low-amplitude tremor was recorded during 30 July-5 August. Additionally, a M1.4 volcano-tectonic (VT) earthquake was registered on 30 July at 2108. On 4 August at 0939, a plume with low ash content reached 800 m above the summit and drifted W; the Washington Volcanic Ash Advisory Center (VAAC) reported that satellite images showed that the ash had dissipated by 2146 later that night. Continuous gas-and-steam emissions were observed on some mornings; plumes dispersed toward the NW, WNW, and W. The Alert Level remained at Yellow, Phase Two (the middle level on a three-color scale) and the public was warned to stay at least 12 km away from the crater.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)
Report for Santa Maria
Instituto Nacional de Sismología, Vulcanologia, Meteorologia e Hidrología (INSIVUMEH) reported that eruptive activity continued at Santa Maria’s Santiaguito lava-dome complex during 31 July-6 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 pyroclastic flows that descended multiple flanks. During most nights and early mornings incandescence was visible around Caliente dome, along the upper parts of the lava flow, and at several locations on other flanks. Daily explosions (a few per hour on most days) generated gas-and-ash plumes that rose 400-800 m above the summit and drifted NW, W, and SW. Ashfall was reported in San Marcos (8 km SW) and Loma Linda Palajunoj (7 km SW) on 1 and 4 August.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Semeru
PVMBG reported that eruptive activity continued at Semeru during 31 July-6 August. On 3 August white emissions rose about 100 m above the summit and drifted N, S, and SW. Daily eruptive events, several per day as recorded by the seismic network, generated white and gray emissions that rose 500-1,000 m above the summit and drifted several directions, though plumes were not always visually confirmed. 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
The Kamchatka Volcanic Eruption Response Team (KVERT) reported that eruptive activity at Sheveluch intensified during 25 July-1 August. Vigorous degassing activity accompanied the effusive eruption in the N area of the crater of Young Sheveluch, as well as the growth of the "300 years of RAS" lava dome on the SW flank of Old Sheveluch. Thermal anomalies were observed over both areas in satellite images analyzed by KVERT on 25, 28, and 30-31 July, and 1 August. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are reported in UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Suwanosejima
The Japan Meteorological Agency (JMA) reported that eruptive activity at Suwanosejima's Ontake Crater continued during 29 July-5 August. Crater incandescence was observed nightly in webcam images. Eruption events at 1907 and 2339 on 2 August produced ash plumes that rose 1 km above the crater rim and drifted toward the SE, as well as ejected large ballistic projectiles as far as 400 m from the center of the crater. Rumbling was reported by the Suwanosejima Branch of the Toshima Village Office (3.5 km SSW). Tremor was registered at the same time as the eruption events. The Alert Level remained at 2 (the second level on a five-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
The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported daily emissions and phreatic eruptions at Taal’s Main Crater during 31 July-6 August. There were five phreatic eruptions recorded, each lasting between 1 and 5 minutes. On 31 July diffuse emissions rose 500 m above the crater rim and drifted NE. During 1-6 August moderately dense to dense emissions rose as high as 2.4 km above the crater rim and drifted in several directions. The SO2 concentration was measured at 3,309 tonnes per day (t/d) on 2 August and 4,666 t/d on 5 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 precaution around Main Crater and along the Daang Kastila fissure.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Tungurahua
Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that surveillance cameras showed that ash previously deposited on the NW flank of Tungurahua became resuspended by strong winds on 3 August at around 1252. Additionally, IG-EPN reminded the public that activity levels at Tungurahua remained low.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)