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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 1 May-7 May 2024
Name Country Volcanic Province Eruption Start Date Report Status
Poas Costa Rica Central America Volcanic Arc 2023 Dec 1 New
Purace Colombia Andean Northern Volcanic Arc New
Ruang Indonesia Sangihe Volcanic Arc 2024 Apr 16 New
Sheveluch Russia Eastern Kamchatka Volcanic Arc 1999 Aug 15 New
Tofua Tonga Tofua Volcanic Arc 2015 Oct 2 New
Ubinas Peru Andean Central Volcanic Arc 2024 May 6 New
Aira Japan Ryukyu Volcanic Arc 2017 Mar 25 Continuing
Ebeko Russia Kuril Volcanic Arc 2022 Jun 11 Continuing
Fernandina Ecuador Galapagos Hotspot Volcano Group 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
Lewotolok Indonesia Sunda Volcanic Arc 2020 Nov 27 Continuing
Marapi Indonesia Sunda Volcanic Arc 2023 Dec 3 Continuing
Merapi Indonesia Sunda Volcanic Arc 2020 Dec 31 Continuing
Nevado del Ruiz Colombia Andean Northern Volcanic Arc 2014 Nov 18 Continuing
Reykjanes Iceland Iceland Neovolcanic Rift Zone 2023 Dec 18 Continuing
Sabancaya Peru Andean Central Volcanic Arc 2016 Nov 6 Continuing
Santa Maria Guatemala Central America Volcanic Arc 1922 Jun 22 Continuing
Semeru Indonesia Sunda Volcanic Arc 2017 Jun 6 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 20,299 individual reports over 1,228 weeks (average of 17 per week) on 335 different volcanoes.

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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 Sundoro
Alaid Davidof Irazu Lopevi Puyehue-Cordon Caulle Suoh
Alu-Dalafilla Dempo Iya Machin Rabaul Suretamatai
Ambae Descabezado Grande Izu-Torishima Makushin Raikoke Suwanosejima
Ambang Dieng Volcanic Complex Jackson Segment Maly Semyachik Ranakah Taal
Ambrym Dukono Kaba Manam Raoul Island Tair, Jebel at
Anatahan East Epi Kadovar Manda Hararo Rasshua Takawangha
Aniakchak Ebeko Kaitoku Seamount Marapi Raung Talang
Antillanca Volcanic Complex Ebulobo Kama'ehuakanaloa Maroa Redoubt Tambora
Antuco Edgecumbe Kambalny Martin Reventador Tanaga
Apoyeque Egon Kanaga Masaya Reykjanes Tandikat-Singgalang
Arenal Ekarma Kanlaon Matthew Island Rincon de la Vieja Tangkoko-Duasudara
Asamayama Eldey Karangetang Maule, Laguna del Rinjani Tangkuban Parahu
Askja Erebus Karkar Mauna Loa Ritter Island Tara, Batu
Asosan Erta Ale Karthala Mayon Rotorua Ta'u
Atka Volcanic Complex Etna Karymsky McDonald Islands Ruang Taupo
Augustine Etorofu-Yakeyama [Grozny Group] Kasatochi Melebingoy Ruapehu Telica
Avachinsky Eyjafjallajokull Katla Melimoyu Ruby Tenerife
Awu Fagradalsfjall Katmai Merapi Ruiz, Nevado del Tengger Caldera
Axial Seamount Fernandina Kavachi Midagahara Sabancaya Three Sisters
Azul, Cerro Fogo Kelimutu Misti, El Sakar Tinakula
Azumayama Fonualei Kelud Miyakejima Salak Tofua
Bagana Fournaise, Piton de la Kerinci Momotombo San Cristobal Tokachidake
Balbi Fourpeaked Ketoi Monowai San Miguel Tolbachik
Bamus Fuego Kharimkotan Montagu Island San Vicente Toliman
Banda Api Fujisan Kick 'em Jenny Moyorodake [Medvezhia] Sangay Tongariro
Bardarbunga Fukutoku-Oka-no-Ba Kie Besi Mutnovsky Sangeang Api Trident
Barren Island Galeras Kikai Myojinsho Santa Ana Tungurahua
Batur Galunggung Kilauea Nabro Santa Maria Turrialba
Bezymianny Gamalama Kirishimayama Negra, Sierra Sao Jorge Ubinas
Bogoslof Gamkonora Kita-Ioto Negro, Cerro Sarigan Ugashik-Peulik
Brava Gareloi Kizimen Nightingale Island Sarychev Peak Ukinrek Maars
Bristol Island Gaua Klyuchevskoy Nishinoshima Saunders Ulawun
Bulusan Gorely Kolokol Group Nisyros Savo Unnamed
Calbuco Great Sitkin Koryaksky Novarupta Semeru Unnamed
Callaqui Grimsvotn Krakatau NW Rota-1 Semisopochnoi Veniaminof
Cameroon Guagua Pichincha Krummel-Garbuna-Welcker Nyamulagira Seulawah Agam Villarrica
Campi Flegrei Guallatiri Krysuvik-Trolladyngja Nyiragongo Sheveluch Vulcano
Campi Flegrei del Mar di Sicilia Guntur Kuchinoerabujima Ofu-Olosega Shishaldin West Mata
Cayambe Hachijojima Kurikomayama Okataina Simbo Westdahl
Chachadake [Tiatia] Hakoneyama Kusatsu-Shiranesan Okmok Sinabung Whakaari/White Island
Chaiten Heard Kverkfjoll Ontakesan Sinarka Witori
Chiginagak Hekla La Palma Oraefajokull Siple Wolf
Chikurachki Helgrindur Lamington Osorno Sirung Wrangell
Chiles-Cerro Negro Hierro Lamongan Pacaya Slamet Yakedake
Chillan, Nevados de Hokkaido-Komagatake Langila Pagan Snaefellsjokull Yasur
Chirinkotan Home Reef Lanin Palena Volcanic Group Soputan Yufu-Tsurumi
Chirpoi Hood Lascar Paluweh Sorikmarapi Zaozan [Zaosan]
Ciremai Huaynaputina Late Panarea Sotara Zavodovski
Cleveland Hudson, Cerro Lateiki Papandayan Soufriere Hills Zhupanovsky
Colima Huila, Nevado del Lengai, Ol Doinyo Pavlof Soufriere St. Vincent Zubair Group
Colo Hunga Tonga-Hunga Ha'apai Leroboleng Pelee South Sarigan Seamount
Concepcion Ibu Lewotobi Peuet Sague Spurr
Copahue Ijen Lewotolok Pinatubo St. Helens
 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 Poas
OVSICORI-UNA reported continuing and sometimes vigorous gas-and-steam emissions from vents on the crater floor at Poás during 30 April-7 May. Daily emissions at Boca C contained variable amounts of ash, with low ash content during 3-5 May and maybe none during 5-6 May. Plumes rose as high as 300 m and drifted E, SW, and W. Incandescence at both Boca A and Boca C was periodically visible at night.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Report for Purace
Observatorio Vulcanológico y Sismológico de Popayán, Servicio Geologico Colombiano (SGC) reported that the number of both volcanic tremor (VT) and long-period (LP) seismic events at Puracé increased during 23-29 April. The events had low magnitudes and were located at depths of 0-5 km; the VT events were located beneath the Puracé, Piocollo, and Curiquinga cones. Sulfur dioxide emissions had increased in the previous few weeks and carbon dioxide emissions continued to be above baseline levels at a fumarole on the N crater rim. Slow deformation which began in April 2022 between Puracé and Curiquinga was ongoing.

Both the number and intensity of earthquake events suddenly increased during 29-30 April. Seismicity continued to be elevated during 1-3 May and, along with continuing deformation and increases in gas emissions and other monitoring data, the activity was sustained at a higher level. On 3 May the Alert Level was raised to Orange (the second highest level on a four-color scale). During 3-4 May gas-and-steam emissions rose 1.4 km above the summit and drifted W. Seismicity during 3-6 May continued to increase; VT events were mainly located beneath Puracé at depths less than 4 km and LP events were located beneath the crater and the N flank at depths less than 1 km. Additionally, very low-magnitude events indicating rising magma were located at depths of 1-3.5 km beneath Piocollo and Curiquinga.
Source: Servicio Geológico Colombiano (SGC)
Report for Ruang
PVMBG reported that seismicity at Ruang during 1-2 May was characterized by continuous tremors along with both deep and shallow volcanic earthquakes. The number of seismic events was decreasing based on a seismic station at the Ruang Post, 5 km from the crater; two closer stations, 1.5 and 2.7 km from the crater, had been damaged by eruptions. During 1-4 and 7 May white-and-gray ash plumes that were sometimes dense rose 100-700 m above the summit and drifted in multiple directions. Dense white steam-and-gas plumes rose 100-450 m above the summit and drifted NE, E, and S during 5-7 May.

On 5 May PVMBG reduced the exclusion zone from a 7 km radius around the active crater to 5 km. According to news reports a total of 5,849 residents of Tagulandang Island had been evacuated by 5 May; additional evacuations were halted after the exclusion zone was changed. The Sam Ratulangi International Airport (98 km SW in Manado, North Sulawesi) reopened on 5 May, though several airports remained closed including Djalaludin Airport in Gorongtalo, Siau Airport in the Sitaro Islands, Naha Airport in the Sangihe Islands, Lolakndi Bolaang Mongondow Airport, Miangas Airport, and Melonguane Airport in the Talaud Islands. The Alert Level remained at 4 (the highest level on a scale of 1-4).
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Antara News, Antara News, Antara News, Antara News
Report for Sheveluch
The Kamchatka Volcanological Station reported that seismicity at Sheveluch began increasing on 24 April. According to KVERT a new lava dome, named Karan-1, began to grow on the SW flank at around 0200 local time on 27 April based on the intensification of thermal anomalies detected in satellite observations. During 27 April-3 May intense steam-and-gas emissions rose from the active area and on 28 April an ash plume drifted about 25 km NW. Kamchatka Volcanological Station noted that an ash plume rose 2 km on 30 April. Lava-dome incandescence was occasionally visible during the week in webcam images and a daily intense thermal anomaly over the dome complex was identified in satellite images. 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.
Sources: Kamchatka Volcanological Station, Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Tofua
Tonga Geological Services reported that unrest at Tofua continued during 1-7 May. Thermal anomalies with varying intensities were detected daily. Sulfur dioxide plumes from the 28 April emission event continued to be identified in satellite data during 1-2 May. The Aviation Color Code was raised to Yellow (the second lowest color on a four-color scale) on 2 May; the Maritime Alert Level remained at Orange (the second highest level on a four-color scale); mariners were advised to stay 2 km away from the island; the Alert level for residents of Vava’u and Ha’apai remained at Green (the lowest color on a four-color scale).
Source: Tonga Geological Services, Government of Tonga
Report for Ubinas
Instituto Geofísico del Perú (IGP) reported that thermal anomalies from the Ubinas main crater were identified during 5-6 May. At 0516 on 6 May an ash plume rose 2.1 km above the crater rim and drifted more than 10 km SE. Ashfall was reported in the towns of Ubinas (6.5 km SSE), Tonohaya (7 km SSE), Anascapa (11 km SE), San Miguel (10 km SE), Huarina, and Matalaque (17 km SSE). The Alert Level remained at Yellow (the second level on a four-color scale) and the public was warned to stay 2 km away from the crater.
Source: Instituto Geofísico del Perú (IGP)
Report for Aira
JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 29 April-6 May with nighttime crater incandescence. A very small eruptive event was recorded on 3 May. An explosion at 2131 on 5 May ejected blocks 600-900 m from the vent and produced an ash plume that rose 1.3 km above the crater rim, drifted N, and merged into weather clouds. 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 Ebeko
KVERT reported that moderate explosive activity was ongoing at Ebeko during 25 April-3 May According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions during 27-28 and 30 April, and 1-2 May, generated ash plumes that rose as high as 3 km (10,000 ft) a.s.l. and drifted SW, SE, and NE. A thermal anomaly was identified in satellite images on 30 April; on other days either no activity was observed or weather conditions prevented views. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Fernandina
Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that the eruption at Fernandina continued. The amount of lava flowing into the ocean significantly increased during 25-30 April and the lava flows spread along 800 m of the coastline. During 30 April-7 May daily thermal anomalies from the lava flow were identified in satellite images and gas-and-steam emissions rose from the area where lava entered the ocean. Sulfur dioxide emissions, measured using satellite data, fluctuated between about 205 and 803 tons per day during the first half of the week.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Report for Fuego
INSIVUMEH reported that eruptive activity continued at Fuego during 30 April-7 May. Explosions were recorded daily, averaging 2-10 per hour on most days, when counts were reported. The explosions generated gas-and-ash plumes that rose as high as 1.2 km above the crater rim and drifted as far as 30 km W, SW, and S. Frequent block avalanches descended various drainages including the Ceniza (SSW), Seca (W), Taniluyá (SW), and Las Lajas (SE), Honda (E), and Trinidad (S), and sometimes reached vegetated areas. Weak rumbling sounds and shock waves were reported on most days. On a few of the days ashfall was reported in areas downwind including El Porvenir (11 km SW), El Rodeo, Finca Palo Verde, Sangre de Cristo (8 km WSW), Santa Sofía (12 km SW), Los Yucales (12 km SW), Panimaché I and II (8 km WSW), and Morelia (9 km SW), Finca La Asunción (12 km SW), La Rochela (8 km SSW), Finca Ceilán (9 km S), and San Andrés Osuna (11 km SSW). The explosions also ejected incandescent material up to 300 m above the summit on most 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 was last confirmed in a 30 April radar satellite image; effusion likely continued during 30 April-7 May. Seismicity was low. Weather clouds fully or partly obscured satellite and webcam views, though minor steaming from the vent area was observed in satellite images during 30 April-2 May. 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 Ibu continued to erupt. A few notable eruptive events occurred during 24-29 April. On 24 April ash plumes rose 800-1,500 m above the summit and roaring was heard at the Ibu observation post (9 km W). On 26 April an eruptive event produced a dense gray ash plume that rose 2 km and drifted SW and W, incandescence that emanated about 700 m from the summit, a boom followed by a roaring noise, and ashfall in residential areas downwind. At 0037 on 28 April an ash plume rose 3.5 km and produced lightning in the plume. Booming and roaring was heard at the observation post and ash fell in residential areas to the W. At 2137 on 29 April a dense gray ash plume rose around 1 km and drifted W and NW; incandescent material was ejected 500 m NW, W, and SW. Booming and rumbling was heard at the observation post. During 1-2 and 5 May dense gray or gray-and-white ash plumes rose as high as 2 km and drifted in multiple directions. White steam-and-gas plumes rose as high as 300 m and drifted E, SE, and S on 4 May. An eruptive event was recorded by the seismic network on 6 May but was not visually confirmed. The Alert Level remained at 2 (the second highest level on a four-level scale) and the public was advised to stay 3.5 km away from the active crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Lewotobi
PVMBG reported that gray-to-white ash plumes rose 100-500 m above the summit of Lewotobi’s Laki-laki volcano and drifted in multiple directions during 30 April-5 May. The plumes were sometimes dense. Eruptive events were recorded by the seismic network on 6 May, though no emissions were reported. The Alert Level remained at 2 (the second lowest level on a scale of 1-4) and the public was warned to stay outside of the exclusion zone, defined as a 2-km radius around Laki-laki crater, 3 km to the NNE, and 5 km on the NE flanks.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Lewotolok
PVMBG reported that the eruption at Lewotolok continued during 1-7 May. White steam-and-gas plumes rose 100-700 m above the summit and drifted W and NW on most days. Gray-to-black ash plumes rose 300-500 m and drifted W on 6 May. The Alert Level remained at 3 (on a scale of 1-4) and visitors and residents of Lamawolo, Lamatokan, and Jontona were warned to stay 2 km away from the vent and 3 km away from the vent on the S and SE flanks.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Marapi
PVMBG reported that eruptive activity at Marapi (on Sumatra) was ongoing during 1-7 May. White steam-and-gas plumes rose 200-300 m above the summit and drifted multiple directions almost every day. White-and-gray ash plumes rose 250-300 m above the summit and drifted E and SE on 6 May. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 4.5 km away from the active crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Merapi
BPPTKG reported that the eruption at Merapi (on Java) continued during 26 April-2 May. Seismicity had declined compared to the previous week. The SW lava dome produced 113 lava avalanches that traveled as far as 2 km down the SW flank. Morphological changes to the SW lava dome were due to continuing effusion and collapses of material. The volume of the SW dome was an estimated 2,171,300 cubic meters and the dome in the main crater was stable at an estimated 2,358,200 cubic meters based on a 24 April drone survey and webcam images. The highest temperature of the SW dome was around 215 degrees Celsius, higher than the previous measurement. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location.
Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)
Report for Nevado del Ruiz
Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that eruptive activity at Nevado del Ruiz continued during 30 April-6 May. The number of seismic events associated with fluid movement remained stable at low-to-moderate levels, though the signal increased in magnitude. Some of these signals were associated with pulsating emissions of ash and gas; ash plumes rose as high as 2 km above the summit on 30 April and drifted NW and WNW. Seismicity associated with rock fracturing was stable in both the number and magnitude of events; these earthquakes at depths less than 5 km below the summit were primarily located within 5 km of Arenas Crater, particularly to the E. The largest event was an M 1.2 which was detected at 1842 on 1 May. Several thermal anomalies on the crater floor were identified in satellite data, though weather conditions often inhibited 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.
Source: Servicio Geológico Colombiano (SGC)
Report for Reykjanes
On 7 May IMO reported that the cone just E of Sundhnúk and along the fissure within the Reykanes volcanic system continued to erupt lava, though activity had decreased during the previous few days. Lava flowed short distances from the vent; no significant changes were observed at the S part of the flow field near the earthen barriers at Grindavík. Inflation from magma accumulation beneath Svartsengi was first detected at the beginning of April and the rate of inflation was unchanged for the past few weeks based on modeling of GPS and satellite data. Seismicity increased steadily during the past week. Most of the earthquakes were below M 1 and located N of the vent between Sundhnúk and Stóra Skógfell, S of Mt. Thorbjorn in a valley near Grindavík, and in an area between the vent and Grindavík.
Source: Icelandic Meteorological Office (IMO)
Report for Sabancaya
Instituto Geofísico del Perú (IGP) reported that the eruption at Sabancaya continued at moderate levels during 29 April-5 May with a daily average of 36 explosions. Gas-and-ash plumes rose as high as 2.5 km above the summit and drifted less than 10 km E, SE, and S. Thermal anomalies over the lava dome in the summit crater were identified in satellite data. Slight inflation was detected near the Hualca Hualca sector (4 km N). Sulfur dioxide emissions were at moderate levels, averaging 478 tons per day. The Alert Level remained at Orange (the third level on a four-color scale) and the public was warned to stay outside of a 12 km radius.
Source: Instituto Geofísico del Perú (IGP)
Report for Santa Maria
INSIVUMEH reported that eruptive activity continued at Santa Maria’s Santiaguito lava-dome complex during 30 April-7 May with a lava extrusion and blocks avalanches at the Caliente dome. Incandescence from the dome was visible during most nights and early mornings, and occasional incandescence was also present along the upper parts of the lava flow on the WSW flank. Daily explosions (1-5 per hour on most days) generated gas-and-ash plumes that rose 600-1,400 m above the summit and drifted as far as 25 km W, SW, S. The explosions produced block avalanches on the dome’s flanks and generated occasional short-range pyroclastic flows that descended multiple flanks. Block avalanches from collapses at the dome and at the margins of the upper part of the lava flow were sometimes audible several kilometers from the volcano. Ashfall caused hazy conditions around the volcano during 2-3 April. Minor ashfall was reported in San Marcos Palajunoj (8 km SW) and Finca Pauwlonias (S) during 3-4 and 6-7 April.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Semeru
PVMBG reported that eruptive activity continued at Semeru during 1-7 May and seismicity remained at high levels. One incandescent lava avalanche traveled 800 m down the Besuk Kobokan drainage on the S flank. Eruptive events were recorded by the seismic network during 1-2 May, though plumes were not visually confirmed. Daily white-and-gray ash plumes rose 100-1,000 m above the summit and drifted in multiple directions on the other days of the week. The plumes were dense during 5-6 May. The Alert Level remained at 3 (the third highest 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 Suwanosejima
JMA reported that eruptive activity at Suwanosejima's Ontake Crater continued during 29 April-6 May. Crater incandescence was observed nightly in webcam images. Emissions rose as high as 600 m above the crater rim and blocks were ejected as far as 300 m from the crater’s center; no explosions were detected. 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)