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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 20 September-26 September 2017
Name Location Eruption Start Date Report Status
Agung Bali New
Ambae Vanuatu New
Lopevi Vanuatu New
San Cristobal Sierra de los Marrabios New
Telica Sierra de los Marrabios New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Bezymianny Central Kamchatka (Russia) 2016 Dec 5 Continuing
Bogoslof Fox Islands (USA) Continuing
Cleveland Chuginadak Island (USA) Continuing
Dukono Halmahera 1933 Aug 13 Continuing
Ebeko Paramushir Island (Russia) 2022 Jun 11 Continuing
Karymsky Eastern Kamchatka (Russia) Continuing
Kilauea Hawaiian Islands (USA) 2021 Sep 29 Continuing
Klyuchevskoy Central Kamchatka (Russia) 2023 Jun 22 Continuing
Langila New Britain (Papua New Guinea) 2015 Oct 22 (?) Continuing
Nevados de Chillan Central Chile Continuing
Pacaya South-Central Guatemala Continuing
Sabancaya Peru 2016 Nov 6 Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Sinabung Northwestern Sumatra Continuing
Turrialba Costa Rica Continuing
Ulawun New Britain (Papua New Guinea) 2023 Jul 18 Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 19,386 individual reports over 1,186 weeks (average of 16 per week) on 331 different volcanoes.

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Agung Cotopaxi Ijen Lewotobi Peuet Sague South Sarigan Seamount
Ahyi Cuicocha Iliamna Lewotolok Pinatubo Spurr
Aira Cumbal Iliwerung Little Sitkin Planchon-Peteroa St. Helens
Akan Dabbahu Inielika Llaima Poas Stromboli
Alaid Davidof Ioto Lokon-Empung Popocatepetl Sulu Range
Alu-Dalafilla Dempo Irazu Lonquimay Purace Sumbing
Ambae Descabezado Grande Iya Lopevi Puyehue-Cordon Caulle Sundoro
Ambang Dieng Volcanic Complex Izu-Torishima Machin Rabaul Suretamatai
Ambrym Dukono Jackson Segment Makushin Raikoke Suwanosejima
Anatahan Ebeko Kaba Maly Semyachik Ranakah Taal
Aniakchak Ebulobo Kadovar Manam Raoul Island Tair, Jebel at
Antillanca Volcanic Complex Edgecumbe Kaitoku Seamount Manda Hararo Rasshua Takawangha
Antuco Egon Kama'ehuakanaloa Marapi Raung Talang
Apoyeque Ekarma Kambalny Maroa Redoubt Tambora
Arenal Eldey Kanaga Martin Reventador Tanaga
Asamayama Epi Kanlaon Masaya Reykjanes Tandikat-Singgalang
Askja Erebus Karangetang Maule, Laguna del Rincon de la Vieja Tangkoko-Duasudara
Asosan Erta Ale Karkar Mauna Loa Rinjani Tangkuban Parahu
Atka Volcanic Complex Etna Karthala Mayon Ritter Island Tara, Batu
Augustine Etorofu-Yakeyama [Grozny Group] Karymsky McDonald Islands Rotorua Ta'u
Avachinsky Eyjafjallajokull Kasatochi Melimoyu Ruang Taupo
Awu Fagradalsfjall Katla Merapi Ruapehu Telica
Axial Seamount Fernandina Katmai Midagahara Ruby Tenerife
Azul, Cerro Fogo Kavachi Misti, El Ruiz, Nevado del Tengger Caldera
Azumayama Fonualei Kelimutu Miyakejima Sabancaya Three Sisters
Bagana Fournaise, Piton de la Kelud Momotombo Sakar Tinakula
Balbi Fourpeaked Kerinci Monowai Salak Tofua
Bamus Fuego Ketoi Montagu Island San Cristobal Tokachidake
Banda Api Fujisan Kharimkotan Moyorodake [Medvezhia] San Miguel Tolbachik
Bardarbunga Fukutoku-Oka-no-Ba Kick 'em Jenny Mutnovsky San Vicente Toliman
Barren Island Galeras Kie Besi Myojinsho Sangay Tongariro
Batur Galunggung Kikai Nabro Sangeang Api Trident
Bezymianny Gamalama Kilauea Negra, Sierra Santa Ana Tungurahua
Bogoslof Gamkonora Kirishimayama Negro, Cerro Santa Maria Turrialba
Brava Gareloi Kita-Ioto Nightingale Island Sao Jorge Ubinas
Bristol Island Gaua Kizimen Nishinoshima Sarigan Ugashik-Peulik
Bulusan Gorely Klyuchevskoy Nisyros Sarychev Peak Ukinrek Maars
Calbuco Great Sitkin Kolokol Group Novarupta Saunders Ulawun
Callaqui Grimsvotn Koryaksky NW Rota-1 Savo Unnamed
Cameroon Guagua Pichincha Krakatau Nyamulagira Semeru Unnamed
Campi Flegrei del Mar di Sicilia Guallatiri Krummel-Garbuna-Welcker Nyiragongo Semisopochnoi Veniaminof
Cayambe Guntur Krysuvik-Trolladyngja Ofu-Olosega Seulawah Agam Villarrica
Chachadake [Tiatia] Hachijojima Kuchinoerabujima Okataina Sheveluch Vulcano
Chaiten Hakoneyama Kurikomayama Okmok Shishaldin West Mata
Chiginagak Heard Kusatsu-Shiranesan Ontakesan Simbo Westdahl
Chikurachki Hekla Kverkfjoll Oraefajokull Sinabung Whakaari/White Island
Chiles-Cerro Negro Helgrindur La Palma Osorno Sinarka Witori
Chillan, Nevados de Hierro Lamington Pacaya Siple Wolf
Chirinkotan Hokkaido-Komagatake Lamongan Pagan Sirung Yakedake
Chirpoi Home Reef Langila Palena Volcanic Group Slamet Yasur
Ciremai Hood Lanin Paluweh Snaefellsjokull Yufu-Tsurumi
Cleveland Huaynaputina Lascar Panarea Soputan Zaozan [Zaosan]
Colima Hudson, Cerro Late Papandayan Sorikmarapi Zavodovski
Colo Huila, Nevado del Lateiki Parker Sotara Zhupanovsky
Concepcion Hunga Tonga-Hunga Ha'apai Lengai, Ol Doinyo Pavlof Soufriere Hills Zubair Group
Copahue Ibu Leroboleng Pelee Soufriere St. Vincent
 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 Agung
BNPB noted that as of 1300 on 22 September there were 9,421 people displaced from the evacuation zones at Agung. Seismicity continued to increase, therefore later that day on 22 September PVMBG raised the Alert Level to 4 (the highest level on a scale of 1-4) and expanded the exclusion zone to 9 km, with an additional expansion to 12 km in the SE, S, and SW directions. On 24 September BNPB reported that the number of evacuees continued to grow, as residents were leaving the expanded evacuation zones; there were 34,931 people in 238 shelters. The report noted that some people were returning home in the daytime to feed their livestock. On 27 September the number of evacuees reached 96,086 (spread out in 430 shelters), seismic activity continued to escalate, and diffuse white plumes rose 50 m above the crater rim.
Sources: Badan Nacional Penanggulangan Bencana (BNPB), Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Ambae
On 23 September the Vanuatu Geohazards Observatory (VGO) stated that activity at Aoba continued to increase, prompting them to raise the Alert Level to 4 (the second highest level on a scale of 0-5). On 24 September photos showed an ash plume rising above the crater rim, and ashfall was reported in areas across the island. One report noted that ashfall had been reported for a few weeks. The Vanuatu government’s Council of Ministers declared a state of emergency on the island on 26 September; about 36 schools were closed. That same day the New Zealand Defence Force conducted an overflight and posted a video showing an ash plume and lava fountains rising from the vent. On 27 September a news article stated that about 8,000 residents were in 35 evacuation shelters, mostly evacuated from the N and S parts of the island to the E and W areas.
Sources: Vanuatu Meteorology and Geo-Hazards Department (VMGD), Radio New Zealand, Radio New Zealand, Asia Pacific Report, Asia Pacific Report, New Zealand Defence Force (NZDF), Yumi Toktok Stret News
Report for Lopevi
Increased activity at Lopevi prompted the Vanuatu Geohazards Observatory to increase the Alert Level to 2 (on a scale of 0-4). The report noted that all visitors should not approach the crater area.
Source: Vanuatu Meteorology and Geo-Hazards Department (VMGD)
Report for San Cristobal
Based on seismic data INETER reported that a period of tremor recorded at San Cristóbal during 1939-2005 on 9 September ended with an explosion signal.
Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Report for Telica
INETER reported that a small gas explosion was heard by local residents on 10 September. INETER warned the public to stay at least 2 km away from the crater.
Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Report for Aira
JMA reported that 29 events at Showa Crater (at Aira Caldera’s Sakurajima volcano) detected during 19-22 September sometimes produced plumes that rose 1.8 km. At 0445 on 24 September an eruption plume rose 1 km. The Alert Level remained at 3 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)
Report for Bezymianny
KVERT reported that during 15-22 September lava continued to flow down the W flank of Bezymianny's dome, and incandescence from the dome was visible at night. A thermal anomaly was identified in satellite images during 15-19 September. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Bogoslof
AVO reported that during 20-26 September nothing significant was observed in partly to mostly cloudy satellite images of Bogoslof, and no activity was detected in seismic or infrasound data. Weakly elevated surface temperatures were identified in satellite images during 22-23 September, indicating ongoing unrest. 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 Cleveland
AVO reported that during 20-24 September nothing significant was observed in satellite images and web camera views of Cleveland, and nothing noteworthy was detected in seismic or infrasound data. Minor steaming was noted during 22-24 September. A three-minute-long explosion that began at 1747 on 25 September was detected by seismic and infrasound sensors. Satellite data 30 minutes later suggested that a volcanic cloud likely containing ash rose to 4.6 km (15,000 ft) a.s.l. and drifted S. 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 Dukono
Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 20-26 September ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted in multiple directions.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Ebeko
Based on observations by volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 15-17 September generated ash plumes that rose 3 km (10,000 ft) a.s.l. Minor amounts of ash fell in Severo-Kurilsk on 16 and 18 September. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Karymsky
KVERT reported that a weak thermal anomaly over Karymsky was identified in satellite images during 15-16 September. An ash cloud rose 7 km (23,000 ft) a.s.l. and drifted for about 100 km NE on 19 September. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kilauea
During 20-26 September HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Webcams recorded incandescence from long-active sources within Pu'u 'O'o Crater and from a small lava pond in a pit on the W side of the crater. The 61G lava flow, originating from a vent on Pu'u 'O'o Crater's E flank, continued to enter the ocean at Kamokuna. Surface lava flows were active above and on the pali, and on the coastal plain. During 23-24 September a short-lived breakout above the ocean entry disrupted the ramp and produced a brief "firehose" of lava.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Klyuchevskoy
KVERT reported that during 16-17 September a weak thermal anomaly at Klyuchevskoy was identified in satellite images. KVERT noted that the last time ash was emitted from the volcano was on 7 September; the Aviation Color Code was lowered to Yellow (the second lowest level on a four-color scale).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Langila
Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that during 22-23 September ash plumes from Langila rose 2.1 km (7,000 ft) a.s.l. and drifted NNW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Nevados de Chillan
Servicio Nacional de Geología and Minería (SERNAGEOMIN) Observatorio Volcanológico de Los Andes del Sur (OVDAS) reported that a phreatic explosion at Nevados de Chillán's Volcán Arrau dome complex was recorded by a webcam on 21 September. An explosion ejected gas and tephra on 23 September. The Alert Level remained at Yellow, the middle level on a three-color scale, and the public was reminded not to approach the craters within a 3-km radius.
Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Report for Pacaya
INSIVUMEH reported that during 21-22 September Strombolian explosions at Pacaya’s Mackenney cone ejected material as high as 100 m above the crater rim. During 23-24 September the seismic network recorded Strombolian explosion signals.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Sabancaya
Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya increased; there was an average of 45 explosions recorded per day during 18-24 September. The earthquakes were dominated by long-period events, with fewer signals indicating emissions and hybrid events. Gas-and-ash plumes rose 3.5 km above the crater rim and drifted no more than 40 km E and SE. The MIROVA system detected seven thermal anomalies. The report warned the public not to approach the crater within a 12-km radius.
Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)
Report for Sheveluch
KVERT reported that a thermal anomaly over Sheveluch was identified daily in satellite images during 15-22 September. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Sinabung
Based on observations by PVMBG, webcam and satellite images, and model data, the Darwin VAAC reported that during 22-23 September ash plumes from Sinabung rose 3.4-4 km (11,000-13,000 ft) a.s.l. and sometimes drifted E and SE. On 25 September ash plumes rose 6.4 km (21,000 ft) a.s.l. and drifted ESE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Turrialba
OVSICORI-UNA reported that events at Turrialba at 1112 on 25 September and 0910 on 26 September generated plumes that rose 300 m above the crater rim and drifted NW.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Report for Ulawun
Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 25 September a minor ash plume from Ulawun rose 3 km (10,000 ft) a.s.l. and drifted WSW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)