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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, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail.

This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed narratives on various volcanoes are published as reports of the Bulletin of the Global Volcanism Network.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 14 October-20 October 2015
Name Location Eruption Start Date Report Status
Copahue Central Chile-Argentina border New
Fuego Guatemala 2002 Jan 4 New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Bagana Bougainville (Papua New Guinea) 2000 Feb 28 (in or before) Continuing
Batu Tara Komba Island (Indonesia) Continuing
Cleveland Chuginadak Island (USA) Continuing
Colima Mexico Continuing
Concepcion Nicaragua Continuing
Cotopaxi Ecuador Continuing
Dukono Halmahera (Indonesia) 1933 Aug 13 Continuing
Karangetang Siau Island (Indonesia) 2018 Nov 25 Continuing
Karymsky Eastern Kamchatka (Russia) Continuing
Kilauea Hawaiian Islands (USA) Continuing
Nevado del Ruiz Colombia 2017 Dec 18 Continuing
Piton de la Fournaise Reunion Island (France) Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Shishaldin Fox Islands (USA) Continuing
Sinabung Indonesia 2020 Aug 8 Continuing
Tungurahua Ecuador Continuing
Ubinas Peru Continuing
Whakaari/White Island North Island (New Zealand) Continuing
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 16,153 individual reports over 1,038 weeks (average of 16 per week) on 307 different volcanoes.

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

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

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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 monthly, and 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 Copahue
According to the Buenos Aires VAAC, the webcam recorded weak emissions of steam, gas, and possibly minor amounts of ash rising from Copahue during 16-18 October.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Report for Fuego
INSIVUMEH reported that during 13-14 October lava fountains periodically rose 150 above Fuego's crater, producing a 300-m-long lava flow in the Santa Teresa (W) drainage. Weak explosions generated ash plumes that rose 750 m above the crater. During 16-17 October cloud cover prevented visual observations; explosions were heard and shock waves were detected. During 19-20 October ash plumes from explosions rose 550 m high. The lava flow was 500 m long.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Report for Aira
JMA reported that during 13-16 October small scale explosions occurred at Showa Crater, at Aira Caldera’s Sakurajima volcano. The Alert Level remained at 3 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)
Report for Bagana
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 16-20 October ash plumes from Bagana rose to altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted 20-95 km N, NE, E, and SE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Batu Tara
Based on analysis of satellite imagery and wind data, the Darwin VAAC reported that during 14-19 October ash plumes from Batu Tara rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted 45-130 km WSW and W.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Cleveland
AVO reported that strongly elevated temperatures at Cleveland had not been detected since 18 August, and moderately elevated temperatures have been observed with decreasing regularity since then (30 September was the most recent instance). In addition, explosive activity, as detected by infrasound, last occurred on 6 August. Due to the declining activity and indications that lave effusion likely had stopped, AVO lowered the Level of Concern Color Code to Yellow and the Volcano Alert Level to Advisory on 14 October.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Colima
The Unidad Estatal de Protección Civil de Colima reported that on 6 October scientists conducted an overflight of Colima and noted that the summit crater was 200 m wide and 50 m deep. Explosions had excavated parts of the crater, exposing the inner wall stratigraphy in the W and N parts of the crater. Fumarolic plumes rose from vents outside of the crater and from the SE interior. Weaker fumarolic activity was present in the NE and W sectors. An explosion on 5 October had produced a small pyroclastic flow that had traveled 2.1 km down the flanks. The report reminded the public to stay at least 5 km away from the crater, and 12 km away in the Montegrande drainage. Based on satellite images, wind data, webcam views, and notices from the Mexico City MWO, the Washington VAAC reported that during 13-16 and 18-19 October ash plumes from Colima rose to altitudes of 5.5-6.7 km (15,000-22,000 ft) a.s.l. and drifted SW and NW.
Sources: Unidad Estatal de Protección Civil de Colima, Washington Volcanic Ash Advisory Center (VAAC)
Report for Concepcion
Based on seismic data, INETER reported that a lahar at Concepción detected between 1210 and 1305 on 14 October impacted local communities. Material was deposited in the streets of La Chirca (N), La Unión (SE), and Los Ramos (SE).
Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Report for Cotopaxi
IG reported that during 14-20 October cloud cover sometimes obscured views of Cotopaxi although emissions were observed daily. Gas, steam, and ash plumes rose as high as 2 km above the crater and drifted W, NW, N, and E. Small lahars descended the NW flank during 14-15 October, and a small lahar traveled down the Agualongo gorge on 16 October. Ashfall was reported during 16-17 and 19-20 October in Ticatilín, Lasso (60 km N), Chasqui (48 km NNW), Agualongo, Mariscal Sucre (50 km NNW), Rumipamba, San Fernando (58 km NNW), Selva Alegre (54 km NNW), Rumiñahui (61 km N), Vallecito, Aloasí (23 km NW), Aloag (28 km NW), Jambelí, El Chaupi (24 km WNW), Tanicuchi (25 km SW), and Maldonado.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
Report for Dukono
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 14-20 October ash plumes from Dukono rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted 30-150 km NE, NNE, and N.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Karangetang
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 18 October ash plumes from Karangetang rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 75-95 km NE.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Karymsky
KVERT reported that moderate explosive activity at Karymsky continued during 9-16 October. Satellite images showed a thermal anomaly over the volcano on 11 October. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Kilauea
HVO reported that seismicity beneath Kilauea's summit, upper East Rift Zone, and Southwest Rift Zone was at background levels during 14-20 October. The lava lake continued to circulate and spatter in the Overlook vent; small rockfalls into the lake during 14-15 October caused brief spattering and lake-surface agitation. The June 27th NE-trending lava flow continued to be active within 2.2-6.3 km NE of Pu'u 'O'o Crater.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Report for Nevado del Ruiz
Servicio Geológico Colombiano’s (SGC) Observatorio Vulcanológico y Sismológico de Manizales reported that during 13-19 October seismicity at Nevado del Ruiz was characterized by long-period earthquakes and short-duration volcanic tremor associated with gas-and-ash emissions. Earthquakes occurred at depths between 0.9 and 8.5 km. The largest event was recorded at 2328 on 13 October, a local M 1.8, near Arenas Crater at a depth of 2.7 km. Significant amounts of water vapor and gas rose from the crater during the week. A gas, steam, and ash plume rose 1.8 km and drifted NW on 17 October. The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity").
Source: Servicio Geológico Colombiano (SGC)
Report for Piton de la Fournaise
OVPDLF reported that on 12 October there was a strong increase in tremor intensity at Piton de la Fournaise, with values reaching or exceeding those detected during the first few hours of the beginning of the eruption (24 August). A strong increase in sulfur dioxide emissions was also detected by a ground-based DOAS (Differential Optical Absorption Spectrometer); values on 2 October were 205 tonnes per day (t/d) and values on 12 October were 1,990 t/d. A satellite-based sensor recorded 1,138 t/d during 13-14 October which was twice the amount measured on 24 August. The satellite-based lava-flow rate on 14 October was 12 m³/s (±4 m³/s), consistent with model data. Strain measurements showed deflation. Several small ephemeral vents across the lava field produced lava flows, and in many instances hornitos were present at these vents. A hornito SW of the cone ejected spatter during 13-14 October. Activity continued to increase on 17 October. The cone continued to grow; the base was 100 m in diameter and it was about 40 m high. Parts of the cone rim continued to collapse, and a notch in the rim allowed for periodic lava-lake overflows.
Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)
Report for Sheveluch
KVERT reported that during 9-16 October lava-dome extrusion onto Sheveluch’s N flank was accompanied by fumarolic activity, dome incandescence, and hot avalanches. Satellite images detected a daily thermal anomaly over the dome. An ash plume drifted 44 km SW on 9 Ocotber. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Shishaldin
AVO reported that seismicity at Shishaldin continued to be elevated over background levels during 14-20 October, indicating that low-level eruptive activity confined to the summit crater continued. Cloud cover often prevented satellite and webcam observations; weakly elevated surface temperatures were detected in satellite images on 16 October. 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 Sinabung
Based on satellite images and information from PVMBG, the Darwin VAAC reported that on 16 October an ash plume from Sinabung rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted 45 km SW. On 20 October ash plumes rose to an altitude of 5.2 km (17,000 ft) a.s.l. and drifted 55 km N.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Report for Tungurahua
IG reported that seismicity decreased after a period of Strombolian activity at Tungurahua detected during 1900-2100 on 11 October; explosions were detected at 2015, 2110, and 2248. An explosion at 2318 on 13 October ejected blocks onto the W flank. Ashfall was reported in Choglontus (13 km WSW) the next morning. Cloud cover often prevented views of the summit area during 14-20 October. Ash fell in Cotaló (8 km NW), Bilbao (8 km W), and Choglontus on 19 October. Later that day a steam-and-ash emission rose 500 m above the crater and drifted W. Ashfall was reported in Manzanó (8 km SW) on 20 October.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
Report for Ubinas
Instituto Geofísico del Perú (IGP) Observatorio Volcanológico del Sur (OVS) reported that during 13-19 October seismicity at Ubinas fluctuated; moderate levels of seismicity were detected near the beginning of the period but then declined during the second half of the week. Thermal anomalies were detected during 13-14 October. Five explosions generated ash plumes that rose 2 km above the crater on 15 October.
Source: Instituto Geofísico del Perú (IGP)
Report for Whakaari/White Island
On 14 October the GeoNet Data Centre reported a recent slight intensification of activity at White Island. Increased amounts of CO2 emitted from one of the large accessible fumaroles was detected on 1 October along with a temperature increase. SO2 emissions at the volcano also increased. On 8 October volcanic tremor magnitude strengthened and became banded (the signal disappeared and reappeared every few hours), commonly noted during eruptions and periods of unrest. The Volcanic Alert Level remained at 1 and the Aviation Colour Code remained Green.
Source: GeoNet