Smithsonian / USGS Weekly Volcanic Activity Report

















New Activity Highlights


 Activity for the week of 7 February-13 February 2018


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 at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.

Name Location Activity
Fuego Guatemala New
Kadovar Papua New Guinea New
Mayon Luzon (Philippines) New

Agung Bali (Indonesia) Ongoing
Aira Kyushu (Japan) Ongoing
Ambae Vanuatu Ongoing
Bagana Bougainville (Papua New Guinea) Ongoing
Cleveland Chuginadak Island (USA) Ongoing
Dukono Halmahera (Indonesia) Ongoing
Ebeko Paramushir Island (Russia) Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Pacaya Guatemala Ongoing
Popocatepetl Mexico Ongoing
Sabancaya Peru Ongoing
Santa Maria Guatemala Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Shishaldin Fox Islands (USA) Ongoing


New Activity/Unrest


Volcano index photo  Fuego  | Guatemala  | 14.473°N, 90.88°W  | Elevation 3763 m

INSIVUMEH reported that explosions at Fuego during 7-13 February generated ash plumes that rose as high as 1.5 km and drifted 10-12 km N, NW, SW, and S. Avalanches of material traveled down the Seca (W), Ceniza (SSW), and Taniluyá (SW) drainages on 12 February, and down the Las Lajas (SE) and Honda (E) drainages on 13 February. Ash fell in areas downwind on 13 February including Morelia (9 km SW) and Panimaché (8 km SW).

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)



Volcano index photo  Kadovar  | Papua New Guinea  | 3.608°S, 144.588°E  | Elevation 365 m

RVO reported that on 9 February the lava dome at Kadovar’s SE Coastal Vent collapsed, causing 5-6 minor tsunamis, less than 1 m high, observed by residents on Blup Blup’s E and W coasts. The waves were reported at 1050, before the main collapse of the dome. In a 12 February report RVO noted that activity from Main Crater consisted of white plumes rising 20 m and drifting a few kilometers SE and weak nighttime crater incandescence.

Source: Rabaul Volcano Observatory (RVO)



Volcano index photo  Mayon  | Luzon (Philippines)  | 13.257°N, 123.685°E  | Elevation 2462 m

PHIVOLCS reported that during 7-13 February activity at Mayon continued to be characterized daily by lava effusion from the summit crater, rockfalls, lava fountains, steam emissions, advancing lava flows on the flanks, and pyroclastic flows. Numerous rockfall events were generated from the front and margins of advancing lava flows. Lava fountaining was nearly continuous during 6-10 February, with around 290 lava-fountaining events recorded by the seismic network from 0557 on 5 February until around 0700 on 10 February. The events each lasted between 3 and 233 minutes, and were accompanied by rumbling sounds audible with a 10-km radius. Lava fountaining was sporadic during 11-13 February. Lava fountains during phases of both nearly continuous and sporadic activity rose as tall as 400 m, and produced steam plumes up to 2.5 km above the crater that drifted in multiple directions. Lava flows advanced to 3.3 km, 4.5 km, and 900 m in the Mi-isi (S), Bonga (SE), and Basud (E) drainages, respectively. Pyroclastic density currents traveled 4.2-4.6 km in the Mi-isi, Bonga, and Basud drainages. The Alert Level remained at 4 (on a 0-5 scale) and the public was warned to remain outside of the Danger Zone defined as an area within an 8-km radius.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)



Ongoing Activity


Volcano index photo  Agung  | Bali (Indonesia)  | 8.343°S, 115.508°E  | Elevation 2997 m

On 10 February PVMBG reported that activity at Agung had declined during the previous month or two leading the observatory to lower the Alert Level to 3 (on a scale of 1-4) and adjusted the exclusion zone to a 4-km radius. The report noted that the tallest eruption plume in January was 2.5 km above the crater rim, occurring on 19 January, and the last event on 24 January generated a plume that rose 1 km. The volume of erupted lava was an estimated 20 million cubic meters in December 2017, and had not significantly changed. Seismicity continued to fluctuate, though the number and magnitude of events had declined. Satellite data showed a decrease in thermal output reflective of a reduced lava flow rate. PVMBG warned that activity at Agung is still high and unstable; tiltmeter data showed low rates of inflation (GPS patterns were stable) and gas-emission data indicated magma movement at depth, though at a lower intensity compared to values measured at the end of November 2017. An event at 1149 on 13 February generated as ash plume that rose 1.5 km above the crater rim.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)



Volcano index photo  Aira  | Kyushu (Japan)  | 31.593°N, 130.657°E  | Elevation 1117 m

JMA reported that very small events occurred at Minamidake crater (at Aira Caldera’s Sakurajima volcano) during 7-9 February. Crater incandescence from the summit crater was visible during 8-10 February. An event at 2201 on 11 February generated a plume that rose 1 km above the crater rim. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)



Volcano index photo  Ambae  | Vanuatu  | 15.4°S, 167.83°E  | Elevation 1496 m

Based on satellite, pilot, and webcam observations, the Wellington VAAC reported that during 8-9 February ash plumes from Aoba rose to altitudes of 2.7-3 km (9,000-10,000 ft) a.s.l. and drifted N and E.

Source: Wellington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Bagana  | Bougainville (Papua New Guinea)  | 6.137°S, 155.196°E  | Elevation 1855 m

Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 7-8 February ash plumes from Bagana rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted NE.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Cleveland  | Chuginadak Island (USA)  | 52.825°N, 169.944°W  | Elevation 1730 m

AVO reported that there was no evidence of significant activity at Cleveland since the last explosion was detected on 18 December 2017. The Aviation Color Code was lowered to Yellow and the Volcano Alert Level was lowered to Advisory. AVO noted that low-level unrest continued.

Source: US Geological Survey Alaska Volcano Observatory (AVO)



Volcano index photo  Dukono  | Halmahera (Indonesia)  | 1.693°N, 127.894°E  | Elevation 1229 m

Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 7-13 February ash plumes from Dukono rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted NE, E, and SE.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Ebeko  | Paramushir Island (Russia)  | 50.686°N, 156.014°E  | Elevation 1103 m

Based on observations by volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 5-8 February generated ash plumes that rose as high as 2.4 km (7,900 ft) a.s.l. Ash fell in Severo-Kurilsk on 8 February. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Karymsky  | Eastern Kamchatka (Russia)  | 54.049°N, 159.443°E  | Elevation 1513 m

KVERT reported that a thermal anomaly over Karymsky was identified in satellite images on 3 February. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Kilauea  | Hawaiian Islands (USA)  | 19.421°N, 155.287°W  | Elevation 1222 m

During 7-13 February HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Webcams recorded incandescence from a small lava pond in a pit on the W side of Pu'u 'O'o Crater. Surface lava flows were active above and on the pali, and on the coastal plain.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Pacaya  | Guatemala  | 14.382°N, 90.601°W  | Elevation 2569 m

INSIVUMEH reported that during 7-13 February Strombolian explosions at Pacaya’s Mackenney Crater ejected material 30 m above the main cone. Lava flows were at most 150 m long on the SW and W flanks.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)



Volcano index photo  Popocatepetl  | Mexico  | 19.023°N, 98.622°W  | Elevation 5393 m

Each day during 7-13 February CENAPRED reported 25-101 emissions from Popocatépetl, with emissions during 11-13 February containing slight amounts of ash. Explosions were detected at 0130 and 2213 on 7 February, at 0457 on 8 February, at 1729 on 12 February, and at 0631 on 13 February. Minor crater incandescence was visible on the morning of 9 February, and at night during 11-12 February. The Alert Level remained at Yellow, Phase Two.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)



Volcano index photo  Sabancaya  | Peru  | 15.787°S, 71.857°W  | Elevation 5960 m

Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya was similar to the previous week; there was an average of 18 explosions recorded per day during 5-11 February. Seismicity was dominated by long-period events, with signals indicating emissions. Gas-and-ash plumes rose 3.9 km above the crater rim and drifted 50 km NW, SW, S, and SE. The MIROVA system detected three thermal anomalies. The sulfur dioxide flux was high, at 2,062 tons per day on 10 February. The report noted that the public should not to approach the crater within a 12-km radius.

Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)



Volcano index photo  Santa Maria  | Guatemala  | 14.757°N, 91.552°W  | Elevation 3745 m

INSIVUMEH reported that explosions at Santa María's Santiaguito lava-dome complex, detected by the seismic network during 7-13 February, generated ash plumes that rose as high as 700 m and drifted SW. Avalanches of material descended the E and SE flanks of the lava dome. Ash fell on La Florida ranch (5 km S) on 10 February.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)



Volcano index photo  Sheveluch  | Central Kamchatka (Russia)  | 56.653°N, 161.36°E  | Elevation 3283 m

KVERT reported that a thermal anomaly over Sheveluch was identified in satellite images during 1-4 and 7 February. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Shishaldin  | Fox Islands (USA)  | 54.756°N, 163.97°W  | Elevation 2857 m

On 7 February AVO reported that seismic and infrasound activity from Shishaldin declined to background levels during the previous month, prompting the observatory to lower the Aviation Color Code to Green and the Volcano Alert Level to Normal.

Source: US Geological Survey Alaska Volcano Observatory (AVO)



Weekly Reports Archive


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




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. 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.




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.




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 page for that volcano and to the complete Weekly Report for that week.

 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.

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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.

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RSS and CAP Feeds

An RSS (Really Simple Syndication) feed for the Weekly Volcanic Activity Report first made available on 5 March 2008 can be utilized with the aid of various free downloadable readers. The report content of the news 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. 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. On 12 March 2009, GeoRSS tags were added so that the latitude and longitude for each volcano could be included with the feed.

At the end of each individual report is a list of the sources used. We would like to emphasize that the World Organization of Volcano Observatories (WOVO) website (http://www.wovo.org/) lists the regional volcano observatories that have the most authoritative data for many of these events.

CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management.


Google Earth Placemarks

A Google Earth network link for the Weekly Volcanic Activity Report was first made available on 1 April 2009. This file 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 page for that volcano and to the complete Weekly Report for that week.

 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)