All times are local unless otherwise stated.

Bezymianny (Russia) | 23 July-29 July 2014 | New Activity / Unrest Cite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	KVERT reported that during 19-25 July weak seismicity and moderate fumerolic activity were observed at Bezymianny. Satellite data showed a thermal anomaly over the volcano all week. On 17 July the Aviation Color Code was lowered to Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Karymsky (Russia) | 23 July-29 July 2014 | New Activity / Unrest Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported weak to moderate seismic activity at Karymsky, indicating that Strombolian activity continued during 19-25 July. Satellite views were obscured by clouds or the imagery showed no activity. On 24 July the Aviation Color Code was lowered to Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Tungurahua (Ecuador) | 23 July-29 July 2014 | New Activity / Unrest Cite this Report
Tungurahua Northern Andean Volcanic Arc	During 23-27 July IG reported that Tungurahua had low levels of seismicity and cloudy conditions with small steam columns observed on 26 July. On 28 July the IG reported an increase in seismic activity and a small explosion with an ash plume that rose 1 km above the crater that moved NW. Ashfall was reported in the Chontapamba area. On 29 July seismicity was moderate and clouds obscured views of the volcano. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ubinas (Peru) | 23 July-29 July 2014 | New Activity / Unrest Cite this Report
Ubinas Central Andean Volcanic Arc	On 23 July the Buenos Aires VAAC reported a weak emission of light ash. During 23-25 July INGEMMET and IGP reported that seismicity at Ubinas has decreased. On 23-24 July mild gas-and-ash emissions rose 200-550 m above the summit and drifted E and NE. On 25 July there were no explosions, but minor gas and ash emissions drifted E. Sources: Instituto Geofísico del Perú (IGP), Instituto Geológico Minero y Metalúrgico (INGEMMET), Buenos Aires Volcanic Ash Advisory Center (VAAC)

Aira (Japan) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	JMA reported three explosive eruptions from Showa Crater at Aira Caldera’s Sakurajima volcano on 22, 25, and 27 July that ejected ballistics 300-800 m away. In general, the eruptions were accompanied by volcanic earthquakes and increasing volcanic tremor. On 28 July a very small eruption cloud rose 200 m above Minami-Dake Crater. The Tokyo VAAC reported that on 23, 25, and 27 July plumes rose to an altitude of 1.5-2.5 km (5,000-8,000 ft) a.s.l. and drifted E and NE. The Alert Level remained at 3 (on a scale of 1-5). Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)
Fuego (Guatemala) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Fuego Central America Volcanic Arc	During 23-29 July INSIVUMEH reported moderate to strong explosions at Fuego, with incandescent blocks being expelled 100-200 m above the crater accompanied by moderate to dark gray ash 400-600 m above the crater that drifted NW, W, and SW. On most days avalanches moved down the flanks. Columns, described as containing ash on 24 and 28 July, rose 4-4.6 km (13,100-15,100 ft) a.s.l. and drifted 8-12 km NE, NW, W, and SW. A weak white fumarolic plume rose above Fuego’s summit crater on 27-28 July. During 26-27 July, rumbling was heard up to 15 km away. Ashfall was reported most days in nearby areas, including the Santa Teresa, Taniluya, Ceniza, and Trinidad drainages, and at the Observatory, Morelia, Hagia Sophia, Ingenio los Tarros, Panimaché, Santa Sofia, Yepocapa, and Finca La Conchita. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kilauea (United States) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 23-29 July HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema`uma`u Crater. Gas emissions remained elevated. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas; smaller particles may have been dropped several kilometers away. On 24 July a small explosion triggered by rockfalls from the southeast crater wall sent spatter onto the closed tourist overlook at Halema`uma`u; small rockfalls also disturbed the lava lake surface on 27 July. Lava flows fed from a vent on Pu`u `O`o's northeast flank continued to advance slowly NE as two lobes that reached 2.4 km from the vent on 25 July. Lava was at or near the surface within the four pits on the crater floor and a small lava flow erupted from the southern pit during the night of 25-26 July. On 28 July there were a few small collapses around the edge of Pu`u `O`o's crater. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Pacaya (Guatemala) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Pacaya Central America Volcanic Arc	INSIVUMEH reported that during 23-29 July white to white-and-blue fumarolic plumes rose 50-75 m above Mackenney Crater at Pacaya and drifted up to 800 m NW, W, SW, and S. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Popocatepetl (Mexico) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Popocatepetl Trans-Mexican Volcanic Belt	CENAPRED reported that during 23-29 July steam and gas emission rose 200-500 m above Popocatépetl’s crater and drifted NW, W, SW, and E. On 29 July, emissions were accompanied by 30 minutes of tremor. Slight nighttime incandescence was observed. The Alert Level remained at Yellow, Phase Two. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Reventador (Ecuador) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Reventador Northern Andean Volcanic Arc	IG reported moderate seismicity including explosions, long-period earthquakes, harmonic tremor, and tremor, though cloud cover mostly prevented observations of Reventador during 23-29 July. On 23 July IG reported that a column rose to 1 km above the crater and on 24 July reported strong roaring and a plume that drifted NW. On 27 July an emission was seen in satellite imagery. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
San Miguel (El Salvador) | 23 July-29 July 2014 | Continuing ActivityCite this Report
San Miguel Central America Volcanic Arc	SNET reported seismic activity at San Miguel during 23-29 July. On 24 July an ash cloud from a small explosion rose 400 m and drifted SW and deposited small amounts of ash in La Morita, Piedra Azul, and San Rafael East. Ash clouds from small explosions on 27-28 July deposited small amounts of ash to the SW in the La Morita Townships of La Piedrita and La Ceiba. Source: Servicio Nacional de Estudios Territoriales (SNET)
Santa Maria (Guatemala) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Santa Maria Central America Volcanic Arc	INSIVUMEH reported that on most days during 23-29 July the active lava dome of Santiaguito was visibly degassing and generating plumes, noting an ash explosion on 26 July rising up to 3 km (9,800 ft) a.s.l. that drifted W. On 28 July thin ash columns rose 3.2 km (10,500 ft) a.s.l. that drifted SW. On most days, fumarolic columns reached 2.7-2.8 km (8,800-9,200 ft) a.s.l. that drifted SW and weak to strong avalanches flowed towards Canyon Nima River I. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 19-26 July lava-dome extrusion onto Shiveluch’s SE flank was accompanied by moderate ash explosions, incandescence of the dome summit, hot avalanches, and fumarolic activity. Satellite data showed a thermal anomaly over the volcano, but satellite images were obscured by clouds or showed the volcano was quiet over the past week. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Shishaldin (United States) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Shishaldin Aleutian Ridge Volcanic Arc	AVO reported that during 23-29 July low-level eruptive activity continued at Shishaldin volcano. Elevated surface temperatures at the summit were detected daily from satellite data. On 26 July satellite and web camera images showed trace dustings of ash over fresh snow in the immediate vicinity of the crater. Web camera images showed short dark streaks of possible debris flow deposits extending from the summit crater on the southeast flank, possibly the result of the melting of snow and ice near the summit due to the increased temperatures in the vicinity of the crater. Web camera and satellite images were mostly obscured due to clouds other days. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Zhupanovsky (Russia) | 23 July-29 July 2014 | Continuing ActivityCite this Report
Zhupanovsky Eastern Kamchatka Volcanic Arc	KVERT reported that during 19-25 July the moderate explosive eruption continued at Zhupanovsky. On 18 and 21 July satellite data showed ash plumes that rose to 4 km (13,100 ft) a.s.l. and extended about 30 and 70 km NE, respectively. A thermal anomaly was observed over the volcano on 19 and 21 July. Tokyo VAAC reported an ash plume on 27 July that rose to 8.5 km (28,000 ft) a.s.l. and drifted N. Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,652 individual reports over 1,244 weeks (average of 17 per week) on 338 different volcanoes.

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

 News Feeds and Google Placemarks

 Criteria & Disclaimers

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.

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.

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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)