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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 24 January-30 January 2024
Name Country Eruption Start Date Report Status
Ahyi United States New
Lewotobi Indonesia 2023 Dec 23 New
Poas Costa Rica 2023 Dec 1 New
Aira Japan 2017 Mar 25 Continuing
Bulusan Philippines Continuing
Dukono Indonesia 1933 Aug 13 Continuing
Ebeko Russia 2022 Jun 11 Continuing
El Misti Peru Continuing
Erta Ale Ethiopia 1967 Jul 2 (in or before) ± 182 days Continuing
Fuego Guatemala 2002 Jan 4 Continuing
Great Sitkin United States 2021 May 25 Continuing
Lewotolok Indonesia 2020 Nov 27 Continuing
Marapi Indonesia 2023 Dec 3 Continuing
Merapi Indonesia 2020 Dec 31 Continuing
Nevado del Ruiz Colombia 2014 Nov 18 Continuing
Sabancaya Peru 2016 Nov 6 Continuing
Santa Maria Guatemala 1922 Jun 22 Continuing
Sheveluch Russia 1999 Aug 15 Continuing
Suwanosejima Japan 2004 Oct 23 Continuing
Ubinas Peru 2024 May 6 Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,183 individual reports over 1,223 weeks (average of 17 per week) on 334 different volcanoes.

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Agung Cotopaxi Iliamna Little Sitkin Poas Sulu Range
Ahyi Cuicocha Iliwerung Llaima Popocatepetl Sumbing
Aira Cumbal Inielika Lokon-Empung Purace Sundoro
Akan Dabbahu Ioto Lonquimay Puyehue-Cordon Caulle Suoh
Alaid Davidof Irazu Lopevi Rabaul Suretamatai
Alu-Dalafilla Dempo Iya Machin Raikoke Suwanosejima
Ambae Descabezado Grande Izu-Torishima Makushin Ranakah Taal
Ambang Dieng Volcanic Complex Jackson Segment Maly Semyachik Raoul Island Tair, Jebel at
Ambrym Dukono Kaba Manam Rasshua Takawangha
Anatahan East Epi Kadovar Manda Hararo Raung Talang
Aniakchak Ebeko Kaitoku Seamount Marapi Redoubt Tambora
Antillanca Volcanic Complex Ebulobo Kama'ehuakanaloa Maroa Reventador Tanaga
Antuco Edgecumbe Kambalny Martin Reykjanes Tandikat-Singgalang
Apoyeque Egon Kanaga Masaya Rincon de la Vieja Tangkoko-Duasudara
Arenal Ekarma Kanlaon Maule, Laguna del Rinjani Tangkuban Parahu
Asamayama Eldey Karangetang Mauna Loa Ritter Island Tara, Batu
Askja Erebus Karkar Mayon Rotorua Ta'u
Asosan Erta Ale Karthala McDonald Islands Ruang Taupo
Atka Volcanic Complex Etna Karymsky Melebingoy Ruapehu Telica
Augustine Etorofu-Yakeyama [Grozny Group] Kasatochi Melimoyu Ruby Tenerife
Avachinsky Eyjafjallajokull Katla Merapi Ruiz, Nevado del Tengger Caldera
Awu Fagradalsfjall Katmai Midagahara Sabancaya Three Sisters
Axial Seamount Fernandina Kavachi Misti, El Sakar Tinakula
Azul, Cerro Fogo Kelimutu Miyakejima Salak Tofua
Azumayama Fonualei Kelud Momotombo San Cristobal Tokachidake
Bagana Fournaise, Piton de la Kerinci Monowai San Miguel Tolbachik
Balbi Fourpeaked Ketoi Montagu Island San Vicente Toliman
Bamus Fuego Kharimkotan Moyorodake [Medvezhia] Sangay Tongariro
Banda Api Fujisan Kick 'em Jenny Mutnovsky Sangeang Api Trident
Bardarbunga Fukutoku-Oka-no-Ba Kie Besi Myojinsho Santa Ana Tungurahua
Barren Island Galeras Kikai Nabro Santa Maria Turrialba
Batur Galunggung Kilauea Negra, Sierra Sao Jorge Ubinas
Bezymianny Gamalama Kirishimayama Negro, Cerro Sarigan Ugashik-Peulik
Bogoslof Gamkonora Kita-Ioto Nightingale Island Sarychev Peak Ukinrek Maars
Brava Gareloi Kizimen Nishinoshima Saunders Ulawun
Bristol Island Gaua Klyuchevskoy Nisyros Savo Unnamed
Bulusan Gorely Kolokol Group Novarupta Semeru Unnamed
Calbuco Great Sitkin Koryaksky NW Rota-1 Semisopochnoi Veniaminof
Callaqui Grimsvotn Krakatau Nyamulagira Seulawah Agam Villarrica
Cameroon Guagua Pichincha Krummel-Garbuna-Welcker Nyiragongo Sheveluch Vulcano
Campi Flegrei Guallatiri Krysuvik-Trolladyngja Ofu-Olosega Shishaldin West Mata
Campi Flegrei del Mar di Sicilia Guntur Kuchinoerabujima Okataina Simbo Westdahl
Cayambe Hachijojima Kurikomayama Okmok Sinabung Whakaari/White Island
Chachadake [Tiatia] Hakoneyama Kusatsu-Shiranesan Ontakesan Sinarka Witori
Chaiten Heard Kverkfjoll Oraefajokull Siple Wolf
Chiginagak Hekla La Palma Osorno Sirung Wrangell
Chikurachki Helgrindur Lamington Pacaya Slamet Yakedake
Chiles-Cerro Negro Hierro Lamongan Pagan Snaefellsjokull Yasur
Chillan, Nevados de Hokkaido-Komagatake Langila Palena Volcanic Group Soputan Yufu-Tsurumi
Chirinkotan Home Reef Lanin Paluweh Sorikmarapi Zaozan [Zaosan]
Chirpoi Hood Lascar Panarea Sotara Zavodovski
Ciremai Huaynaputina Late Papandayan Soufriere Hills Zhupanovsky
Cleveland Hudson, Cerro Lateiki Pavlof Soufriere St. Vincent Zubair Group
Colima Huila, Nevado del Lengai, Ol Doinyo Pelee South Sarigan Seamount
Colo Hunga Tonga-Hunga Ha'apai Leroboleng Peuet Sague Spurr
Concepcion Ibu Lewotobi Pinatubo St. Helens
Copahue Ijen Lewotolok Planchon-Peteroa Stromboli
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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 Ahyi
Signs of unrest at Ahyi Seamount continued. Plumes of discolored water extending as far as 19 km from the summit area were identified in satellite images during 23-26 January. Weather clouds obscured or mostly obscured views during the rest of the week. No volcanic activity was identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi). The Aviation Color Code remained at Yellow (the second lowest level on a four-color scale) and the Volcano Alert Level remained at Advisory (the second lowest level on a four-level scale).
Source: US Geological Survey
Report for Lewotobi
PVMBG reported that the eruption at Lewotobi’s Laki-laki volcano had decreased during 23-29 January based on visual and instrumental data. The lava flow on the NE flank continued to advance, reaching a length of 4 km, though the rate of advancement had slowed by 23 January, possibly due to gentler topography, a decrease in the effusion rate, or a combination of both. A total of 11 pyroclastic flows were detected and traveled 1-2 km N, NNE, and NE, though average distances were closer to 1 km. Eruption plume heights decreased from an average of 1.5 km above the summit to 500 m. The seismic network recorded a total of 388 lava avalanches that traveled as far as 1.5 km N and NE. Sulfur dioxide emissions significantly decreased, and deformation data indicated deflation. Analysis of deep volcanic earthquakes and low-frequency earthquakes both indicated a decrease in the supply of magma to the surface. At 1200 on 29 January the Alert Level was lowered to 3 (the second highest level on a scale of 1-4) and the public was warned to stay outside of the exclusion zone, defined as a 4-km radius around Laki-laki Crater, 5 km to the NNE, and 6 km on the NE flanks.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Antara News
Report for Poas
OVSICORI-UNA reported that at 0546 on 25 January a small phreatic eruption at Poás produced a steam plume that rose more than 500 m high and drifted W. The event produced the tallest plume recorded since 30 September 2019. According to the Comisión Nacional de Prevención de Riesgos y Atención de Emergencias (CNE) the event resulted in the restriction of the number of people that can be on the viewing platform to 56 at a time and visitors were required to wear hardhats. At 1437 on 26 January a more significant phreatic eruption ejected material 300 m above the lake’s surface and produced a gas-and-steam plume that rose 700 m high. During 26-27 January near constant degassing manifested as bubbling in the lake was observed.
Sources: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA), Comisión Nacional de Prevención de Riesgos y Atención de Emergencias (CNE)
Report for Aira
JMA reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 22-29 January with nighttime crater incandescence. An eruptive event at 0014 on 27 January produced an ash plume that rose 1.1 km above the crater rim and drifted S. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 2 km away from both craters.
Source: Japan Meteorological Agency (JMA)
Report for Bulusan
In a special advisory, PHIVOLCS reported increased seismicity at Bulusan, characterized by a total of 126 volcanic-tectonic earthquakes recorded by the seismic network during 0000-2145 on 28 January. The events had magnitudes of 0.3-2.2 and were located at depths of 1-9 km beneath the N and NW flanks. Weak-to-moderate gas emissions rose from the summit crater and active vents, which drifted SW and NW. The Alert Level remained at 1 (the second level on a scale of 0-5) and PHIVOLCS reminded the public not to enter the 4-km-radius Permanent Danger Zone (PDZ) and to be vigilant within the 2-km Extended Danger Zone (EDZ) on the SE flank.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Dukono
PVMBG reported that the eruption at Dukono was ongoing during 24-30 January. Gray-and-white ash plumes rose 100-1,500 m above the summit and drifted S on 25 and 29 January; emissions were not observed on the other days. The Alert Level remained at Level 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Ebeko
KVERT reported that moderate explosive activity was ongoing at Ebeko during 18-25 January. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions during 21-22 January generated ash plumes that rose as high as 3 km (10,000 ft) a.s.l and drifted NE and W. 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 El Misti
Instituto Geofísico del Perú (IGP) reported that lahars descended the SE flanks at El Misti at 1448 on 23 January and at 1642 on 25 January. The report noted that possible areas of impact included the Andamayo and Agua Salada river drainages in the Chiguata District. The public was warned to stay away from the drainages and roads on the SE flank.
Source: Instituto Geofísico del Perú (IGP)
Report for Erta Ale
During 13-23 January lava flows emerged from vents in Erta Ale’s S pit crater and traveled about 500 m S, 200 m NW, and 250 m SSW based on satellite images. Visitors to the volcano took photographs and video of low lava fountaining at a cone and advancing pahoehoe flows. Activity increased notably during the morning of 27 January.
Sources: Copernicus, Il Mondo dei Terremoti, Aventure et Volcans
Report for Fuego
INSIVUMEH reported that eruptive activity continued at Fuego during 23-31 January. Explosions were recorded daily, averaging 2-9 per hour on most days when counts were reported; daily reports were not available on 29 and 30 January. 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 in multiple directions. Explosions caused frequent block avalanches that descended various drainages including the Ceniza (SSW), Seca (W), Taniluyá (SW), and Las Lajas (SE) and reached vegetated areas. The explosions also ejected incandescent material 100-400 m above the summit on most of the days. Ashfall was reported during 25-26 and 27-28 January in areas downwind including Yepocapa (12 km SW), Panimache I and II (8 km SW), Morelia (9 km SW), Santa Sofía (12 km SW), Finca Asuncion (12 km SW), La Rochela (8 km SSW), Finca Ceilán (9 km S), and San Andrés. Ashfall was forecasted to fall in communities to the N, NW, SW, and S on the other days. Weak rumbling sounds and shock waves were frequently reported.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Great Sitkin
AVO reported that the eruption of lava at Great Sitkin’s summit lava dome continued during 24-30 January, confirmed by satellite data acquired during the week. Effusion was concentrated at the center of the dome with minimal advancement at the margins of the flow. The center of the dome uplifted and caused radial cracks; a new lobe of lava extruded from the northernmost crack and traveled 180 m NW of the vent by 24 January. Weakly elevated surface temperatures were identified in satellite data during 24-26 January. Cloudy weather sometimes prevented satellite views of the volcano. Local webcams and seismic data communications that were offline due to a storm-related power failure came back online on 28 January; infrequent, small volcanic earthquakes were detected during 29-30 January. The Volcano Alert Level remained at Watch (the third highest level on a four-level scale) and the Aviation Color Code remained at Orange (the third highest color on a four-color scale).
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Lewotolok
PVMBG reported that the eruption at Lewotolok continued during 24-30 January. White gas-and-steam plumes rose 50-100 m above the summit and drifted NE, E, and SE on 27 and 29 January. White-and-gray plumes rose 50-200 m above the summit and drifted SE on 28 January. Emissions were not visible on the other days. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay at least 2 km away from the summit crater.
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 24-30 January. White-and-gray ash plumes rose 300 m above the summit and drifted N and NE on 25 January. White gas-and-steam plumes rose 150-250 m above the summit and drifted in multiple directions during 28-30 January. Emissions were not observed on the other days. 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 19-25 January. Seismicity remained at high levels. The SW lava dome produced a total of 47 lava avalanches that traveled as far as 1.5 km SW down the upper part of the Bebeng drainage. A total of 19 pyroclastic flows descended the Bebeng drainage as far as 3 km. The pyroclastic flows removed material from the upper parts of the Bebeng and Krasak drainages. According to news articles, minor ashfall was reported in Jelok Village (40 km S) at around 0845 on 21 January. An eruptive event with pyroclastic flows at 1355 that same day produced an ash plume that rose 1 km above the summit and caused ashfall in areas within 17 km SE, E, and NE, though some of the villages were located at greater distances. Minor amounts of ash fell in areas downwind, including Kemalang (15 km SE), Klaten (32 km SE), Selo Districts, Musuk, Boyolali (17 km E), Cepogo (4 km NE), Musuk (11 km ESE), Tamansari, Boyolali Kota, Teras (22 km E), Mojosongo (45 km E), and Sambi (28 ENE) at around 1430. The ash was washed away quickly due to rain. BPPTKG noted that morphological changes to the SW lava dome identified in webcam images were due to continuing collapses of material. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location.
Sources: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG), Antara News, Antara News
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 at low levels during 23-29 January. Seismic events indicating rock fracturing increased in number, though the intensity of the signals was similar to the previous week. These events were mainly located in areas up to 6 km to the NE and SSE of Arenas Crater, and at depths of 1-7 km. The largest event, a M 1.3, occurred at 2105 on 24 January and was located about 1 km SSE of the crater and at a depth of 3 km. Seismicity associated with gas-and-ash emissions remained at similar numbers as the previous week but were less intense. Gas-and-ash emissions drifted NW and N and rose to a maximum height of 1.8 km above the summit, recorded on both 25 and 29 January. Sulfur dioxide emissions varied but decreased overall. The Alert Level remained at Yellow, Level III (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 Sabancaya
Instituto Geofísico del Perú (IGP) reported that the eruption at Sabancaya continued at moderate levels during 22-28 January with a daily average of 47 explosions. Gas-and-ash plumes rose as high as 2 km above the summit and drifted less than 10 km NW and W. 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). The Alert Level remained at Orange (the third level on a four-color scale) and the public were 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 23-31 January with a lava extrusion at the Caliente dome. Daily reports were not available on 29 and 30 January. Incandescence from the dome was visible during most nights and early mornings. Explosions occurring at a rate of 1-6 per hour on most days generated gas-and-ash plumes that rose 600-900 m above the dome and drifted mainly NW, W, and SW. The explosions produced block avalanches on the dome’s W, SW, S, and E flanks and generated occasional, short-range pyroclastic flows that predominantly descended the W, SW, and S flanks. Block avalanches were visible from the margins of the upper part of the lava flow on the SW flank. Ashfall occurred in Loma Linda (7 km W) and San Marcos Palajunoj (8 km SW) during 25-26 January.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Sheveluch
KVERT reported that the eruption at Sheveluch continued during 18-25 January. A thermal anomaly was identified in satellite images during 20-25 January; weather clouds obscured views on the other days. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Suwanosejima
JMA reported that the eruption at Suwanosejima's Ontake Crater continued during 22-29 January. A total of 15 explosions were recorded during the week, with 1-4 occurring each day. Ash plumes rose as high as 1 km above the crater rim and drifted SE and E, and large blocks were ejected as far as 400 m from the vent. Crater incandescence was observed in webcam images nightly and rumbling was occasionally heard in Toshima village (3.5 km SSW). The Alert Level remained at 2 (on a 5-level scale) and the public was warned to stay at least 1 km away from the crater.
Source: Japan Meteorological Agency (JMA)
Report for Ubinas
Instituto Geofísico del Perú (IGP) reported that lahars descended the Volcánmayo drainage on the SE flank at Ubinas at 1910 on 23 January, at 2015 on 25 January, and at 1540 on 27 January. The report noted that the lahars traveled towards the Ubinas River and could possibly impact the Districts of Ubinas, Matalaque, and population centers. The public was warned to stay away from the drainage and to avoid driving on the Querapi-Ubinas-Huarina highway. Daily gas-and-steam plumes rose 100-500 m above the summit and drifted in multiple directions during 24-30 January.
Source: Instituto Geofísico del Perú (IGP)