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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 27 April-3 May 2022
Name Location Eruption Start Date Report Status
Batu Tara Komba Island New
Gaua Banks Islands (Vanuatu) New
Karymsky Eastern Kamchatka (Russia) 2020 Apr 1 New
Krakatau Sunda Strait 2021 May 25 New
Ruapehu North Island (New Zealand) New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Ambae Vanuatu 2021 Dec 5 Continuing
Ambrym Vanuatu Continuing
Dukono Halmahera 1933 Aug 13 Continuing
Great Sitkin Andreanof Islands (USA) 2021 May 25 Continuing
Kilauea Hawaiian Islands (USA) 2021 Sep 29 Continuing
Lewotolok Lembata Island 2020 Nov 27 Continuing
Manam Northeast of New Guinea 2014 Jun 29 Continuing
Merapi Central Java 2020 Dec 31 Continuing
Pavlof Alaska Peninsula, Alaska 2021 Aug 5 Continuing
Semeru Eastern Java 2014 Apr 1 ± 15 days Continuing
Semisopochnoi Aleutian Islands (USA) 2021 Feb 2 ± 2 days Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Suwanosejima Ryukyu Islands (Japan) 2004 Oct 23 Continuing
Wolf Isla Isabela (Galapagos) Continuing
Yasur Vanuatu 1774 Jul 2 (in or before) ± 182 days Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 17,922 individual reports over 1,121 weeks (average of 16 per week) on 321 different volcanoes.

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Agung Copahue Ijen Lewotolok Pinatubo Spurr
Ahyi Cotopaxi Iliamna Little Sitkin Planchon-Peteroa St. Helens
Aira Cuicocha Iliwerung Llaima Poas Stromboli
Akan Cumbal Inielika Lokon-Empung Popocatepetl Sulu Range
Alaid Dabbahu Ioto Lonquimay Purace Sumbing
Alu-Dalafilla Davidof Irazu Lopevi Puyehue-Cordon Caulle Sundoro
Ambae Dempo Iya Machin Rabaul Suretamatai
Ambang Descabezado Grande Izu-Torishima Makushin Raikoke Suwanosejima
Ambrym Dieng Volcanic Complex Jackson Segment Maly Semyachik Ranakah Taal
Anatahan Dukono Kaba Manam Raoul Island Tair, Jebel at
Aniakchak Ebeko Kadovar Manda Hararo Rasshua Takawangha
Antillanca Volcanic Complex Ebulobo Kama'ehuakanaloa Marapi Raung Talang
Antuco Edgecumbe 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 Volcanic Complex 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 Kie Besi Myojinsho Sangeang Api Turrialba
Barren Island Galunggung Kikai Nabro Santa Ana Ubinas
Batur Gamalama Kilauea Negra, Sierra Santa Maria Ugashik-Peulik
Bezymianny Gamkonora Kirishimayama Negro, Cerro Sao Jorge Ukinrek Maars
Bogoslof Gareloi Kita-Ioto Nightingale Island Sarigan Ulawun
Brava Gaua Kizimen Nishinoshima Sarychev Peak Unnamed
Bristol Island Gorely Klyuchevskoy Nisyros Saunders Unnamed
Bulusan Great Sitkin Kolokol Group Novarupta Savo Veniaminof
Calbuco Grimsvotn Koryaksky NW Rota-1 Semeru Villarrica
Callaqui Guagua Pichincha Krakatau Nyamulagira Semisopochnoi Vulcano
Cameroon Guallatiri Krummel-Garbuna-Welcker Nyiragongo Seulawah Agam West Mata
Campi Flegrei del Mar di Sicilia Guntur Krysuvik-Trolladyngja Okataina Sheveluch Westdahl
Cayambe Hachijojima Kuchinoerabujima Okmok Shishaldin Whakaari/White Island
Chachadake [Tiatia] Hakoneyama Kurikomayama Ontakesan Simbo Witori
Chaiten Heard Kusatsu-Shiranesan Oraefajokull Sinabung Wolf
Chiginagak Hekla Kverkfjoll Osorno Sinarka Yakedake
Chikurachki Helgrindur La Palma Pacaya Siple Yasur
Chiles-Cerro Negro Hierro Lamington Pagan Sirung Zaozan [Zaosan]
Chillan, Nevados de Hokkaido-Komagatake Lamongan Palena Volcanic Group Slamet Zavodovski
Chirinkotan Home Reef Langila Paluweh Snaefellsjokull Zhupanovsky
Chirpoi Hood Lanin Panarea Soputan Zubair Group
Ciremai Huaynaputina Lascar Papandayan Sorikmarapi
Cleveland Hudson, Cerro Lateiki Parker Sotara
Colima Huila, Nevado del Lengai, Ol Doinyo Pavlof Soufriere Hills
Colo Hunga Tonga-Hunga Ha'apai Leroboleng Pelee Soufriere St. Vincent
Concepcion Ibu Lewotobi Peuet Sague 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 Batu Tara
PVMBG issued VONAs noting recent increased gas emissions at Batu Tara but no confirmed eruptions. Ground-based observers reported that at 1453 and 1617 on 28 April gas emissions rose 1-1.2 km above the summit and drifted W. At 0054 on 2 May gas emissions rose 500 m and drifted W. The Alert Level remained at 1 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Gaua
On 28 April the Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported ongoing steam-and-gas emissions from Gaua’s Mt. Garet, and warned visitors that they may notice a sulfur odor near the cone. On 3 May local villages, especially in Naveto in the NE part of the island, heard a loud explosion and then saw a dense ash plume rising from Mt. Garet during 0900-0930. The Alert Level remained at 2 (on a scale of 0-5).
Source: Vanuatu Meteorology and Geo-Hazards Department (VMGD)
Report for Karymsky
KVERT reported that a thermal anomaly over Karymsky was visible in satellite images on most days during 22-29 April. Explosions during 21-22 April produced ash plumes that rose as high as 5 km (16,400 ft) a.s.l. and drifted around 95 km E and SE. Explosions at 1410 on 28 April, local time, generated an ash plume that rose to 10 km (32,800 ft) a.s.l., was about 5 x 7 km at it’s top, and drifted WNW. The Aviation Color Code was raised to Red (the highest level on a four-color scale). By 1550 the ash cloud had spread to 28 x 34 km in size and had drifted almost 290 km WNW at an altitude of 9 km. The Aviation Color Code was lowered to orange because ash was no longer being emitted from the volcano. The plume had drifted more than 1,000 km before dissipating.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Krakatau
PVMBG reported that only white gas plumes rose above Anak Krakatau during 27 April-4 May. Satellite images acquired on 27 April and 2 May showed incandescent lava flows in and around the crater and advancing into the sea. BNPB stated to residents and tourists that there should be no activity within 2 km of the volcano, and that residents within 5-7 km should restrict certain activities and prepare to evacuate if necessary. The Alert Level remained at 3 (on a scale of 1-4).
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Badan Nacional Penanggulangan Bencana (BNPB), Sentinel Hub
Report for Ruapehu
On 2 May GeoNet reported that elevated unrest at Ruapehu continued during the previous week, consisting of lake water heating, volcanic gas output, and strong volcanic tremor. Variable tremor levels were characterized by bursts of strong tremor and short periods of weaker tremor. The lake water temperature had risen to 38 degrees Celsius. During an overflight scientists observed reduced upwelling in the lake over the Northern vents and additional upwelling over the main Central Vent, indicating that it was at least partially unblocked. A sulfur dioxide flux of 390 tonnes per day was measured during a flight on 28 April, the sixth highest amount since 2003. The sustained carbon dioxide and sulfur gas emissions, along with high tremor levels, continue to indicate that magma is driving this period of heightened unrest. At around 0945 on 3 May a steam plume was visible slowly rising as high as 1.5 km above the crater rim; it dissipated by 1030. The plume was not accompanied by seismic or acoustic signals, and weather conditions favored cloud formation. Scientists on an overflight that afternoon observed active upwelling and a slightly higher lake level, similar to observations the previous day. The lake temperature had risen to 39 degrees Celsius. Results from lake water chemistry analysis showed no indication that magma was interacting with the hydrothermal system beneath the lake. The Volcanic Alert Level remained at 2 (on a scale from 0-5) and the Aviation Color Code remained at Yellow.
Source: GeoNet
Report for Aira
JMA reported that a very small eruptive event was recorded at Minamidake Crater (at Aira Caldera’s Sakurajima volcano) on 2 May. 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 Ambae
On 28 April the Vanuatu Meteorology and Geo-Hazards (VMGD) reported that the cone in Ambae’s Lake Voui continued to produce steam and ash emissions. The Alert Level remained at 2 (on a scale of 0-5) and the public was warned to stay outside of the Danger Zone, defined as a 2-km radius around the active vents in Lake Voui, and away from drainages during heavy rains.
Source: Vanuatu Meteorology and Geo-Hazards Department (VMGD)
Report for Ambrym
The Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported that incandescence from Ambrym’s Benbow Crater was visible during 25 January-3 February from a lava flow that had effused from a new vent on the NW part of the crater floor. Recent observations indicated that gas and ash was no longer being emitted from the crater, and seismicity had decreased and stabilized. The Alert Level was lowered to 1 (on a scale of 0-5) on 28 April. VMGD warned the public to stay outside of Permanent Danger Zone A, defined as a 1-km radius around Benbow Crater and a 2-km radius around Marum Crater, and additionally to stay 500 m away from the ground cracks created by the December 2018 eruption.
Source: Vanuatu Meteorology and Geo-Hazards Department (VMGD)
Report for Dukono
Based on satellite and wind model data, the Darwin VAAC reported that during 27-29 April and 2-3 May ash plumes from Dukono rose to 2.1 km (7,000 ft) a.s.l. and drifted E, NE, N, and NW. 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.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Great Sitkin
AVO reported that slow lava effusion at Great Sitkin likely continued during 27 April-3 May; no significant seismic activity was detected and weather clouds obscured webcam and satellite 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 Kilauea
HVO reported that lava continued to effuse from a vent in the lower W wall of Kilauea’s Halema`uma`u Crater during 26 April-3 May, entering the active lava lake and flowing onto the crater floor. Roiling and spattering in the SE part of the lake was visible during 26-27 April. The surface of the lava lake was active all week, and the height of the lake fluctuated; the lake occasionally overflowed the rim, sending lava onto the crater floor. Daily breakouts occurred along the margins of the crater rim. The Aviation Color Code and the Volcano Alert Level remained at Orange and Watch, respectively.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Lewotolok
PVMBG reported that the eruption at Lewotolok continued during 26 April-4 May. Daily white-and-gray ash plumes rose 50-600 m above the summit and drifted in multiple directions. Images of the volcano showed incandescent material being ejected above the crater rim. 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 and 4 km away from the crater on the SE flank.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Manam
The Darwin VAAC reported that on 1 May ash plumes from Manam rose to 2.7 km (9,000 ft) a.s.l. and drifted SE and ESE based on information from RVO, satellite images, and weather models. During 2-3 May low-level ash emissions rose to 2.1 km (7,000 ft) a.s.l. and drifted ESE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Merapi
BPPTKG reported that the eruption at Merapi continued during 22-28 April. The heights and morphologies of the SW lava dome and the central lava dome were unchanged from the previous week, and seismicity remained at high levels. As many as 102 lava avalanches traveled a maximum of 2 km, mostly down the Bebeng drainage on the SW flank. 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 Pavlof
AVO reported that the eruption at a vent on Pavlof’s upper E flank was ongoing during 26 April-3 May, though weather conditions sometimes prevented visual observations. Seismic tremor persisted and elevated surface temperatures were identified in satellite images almost daily. A short lava flow had descended the E flank during 26-28 April and was about 500 m long. Steaming from the active vent was visible during 30 April-2 May. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Semeru
PVMBG reported that the eruption at Semeru continued during 26 April-3 May. Almost daily ash plumes were visible rising 300-700 m above the summit that drifted W, SW, and E. Ash plumes were recorded at 0523 and 0557 on 28 April, 0502 and 0649 on 29 April, 0621 on 30 April, 0704 on 2 May, and 0922 on 3 May. A pyroclastic flow from the end of the lava flow descended the SE flank at 0630 on 1 May and produced ash plumes that rose as high as 500 m above the summit. The Alert Level remained at 3 (on a scale of 1-4). The public was warned to stay at least 500 m away from Kobokan drainages within 17 km of the summit, along with other drainages originating on Semeru, 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 Semisopochnoi
AVO reported that low-level eruptive activity at Semisopochnoi's North Cerberus cone continued during 26 April-3 May. Tremor continued to be detected by the seismic network. Weather clouds obscured views of the volcano on most days, though occasional views during 27-29 May revealed new ash deposits on the flanks. 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 Sheveluch
KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 22-29 April, and lava-dome extrusion continued. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Suwanosejima
JMA reported that eruptive activity continued to be recorded at Suwanosejima's Ontake Crater during 25 April-2 May. Eruption plumes rose as high as 800 m above the crater rim and crater incandescence was occasionally visible. One explosion, recorded in Toshima village (3.5 km SSW), generated an ash plume that rose 1.3 km and into weather clouds. The Alert Level remained at 3 and the public was warned to stay 2 km away from the crater.
Source: Japan Meteorological Agency (JMA)
Report for Wolf
IG reported that thermal anomalies over Wolf were periodically identified in satellite images during 26 April-3 May, indicating active lava flows.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
Report for Yasur
On 28 April Vanuatu Meteorology and Geohazards Department (VMGD) reported that activity at Yasur continued at a high level of “major unrest,” as defined by the Alert Level 2 status (the middle level on a scale of 0-4). Ash-and-gas emissions and loud explosions continued to be recorded, with bombs falling in and around the crater. The public was reminded to not enter the restricted area within 600 m around the cone, defined by Danger Zone A on the hazard map.
Source: Vanuatu Meteorology and Geo-Hazards Department (VMGD)