All times are local unless otherwise stated.

Ebeko (Russia) | 15 April-21 April 2009 | New Activity / Unrest Cite this Report
Ebeko Kuril Volcanic Arc	KVERT reported that during 10-17 April observers from Severo-Kurilsk, about 7 km E of Ebeko, observed continued activity. Gas-and-steam plumes with some ash content rose to an altitude of 2.7 km (8,900 ft) a.s.l. and drifted 15 km SE. The Level of Concern Color Code remained at Yellow. Based on analysis of satellite imagery and information from Yelizovo Airport, the Tokyo VAAC reported that on 17 April an ash plume drifted NE at an altitude of 3 km (10,000 ft) a.s.l. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Fernandina (Ecuador) | 15 April-21 April 2009 | New Activity / Unrest Cite this Report
Fernandina Galapagos Hotspot Volcano Group	Based on analysis of satellite imagery and information from IG, the Washington VVAC reported that during 15-16 April gas-and-steam plumes from Fernandina drifted up to 555 km W and a thermal anomaly was detected on the W half of the island. According to news articles, the eruption caused the deaths of numerous fish and multiple sea lions that were found floating in the sea. Sources: Washington Volcanic Ash Advisory Center (VAAC), Agence France-Presse (AFP)
Klyuchevskoy (Russia) | 15 April-21 April 2009 | New Activity / Unrest Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity from Kliuchevskoi was slightly above background levels on 11 April and at background levels the other days during 12-17 April. Satellite imagery revealed gas-and-ash plumes that drifted 90 km NE on 9 and 10 April, and a weak thermal anomaly over the volcano on 14 April. Fumarolic activity was seen on 15 and 16 April. The Level of Concern Color remained at Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
NW Rota-1 (United States) | 15 April-21 April 2009 | New Activity / Unrest Cite this Report
NW Rota-1 Mariana Volcanic Arc	According to a news article from 20 April, scientists investigating NW Rota-1 during the previous two weeks observed the volcano erupting about 520 m below the ocean's surface. Measurements indicated that the volcano had grown about 40 m since 2006. One scientist observed billowing yellow and white sulfur clouds, carbon dioxide bubbles streaming out of the vent, and "ash and pebble-sized rocks raining out of the plume." Source: GuamPDN - Pacific Daily News
Pagan (United States) | 15 April-21 April 2009 | New Activity / Unrest Cite this Report
Pagan Mariana Volcanic Arc	Based on reports from the Washington VAAC, the USGS stated that on 15 April intermittent plumes of steam from Pagan rose to an altitude of 1.8 km (6,000 ft) a.s.l. and drifted 37 km W. Observers on a ship reported that a white plume "with some black" rose 1.8 km (5,700 ft) from the volcano. On 16 April a diffuse plume drifted 85 km W. USGS raised the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. The next day fishermen again reported a plume. Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Paluweh (Indonesia) | 15 April-21 April 2009 | New Activity / Unrest Cite this Report
Paluweh Sunda Volcanic Arc	During 1-17 April, seismic activity from Paluweh increased, prompting CVGHM to raise the Alert Level to 1 (on a scale of 1-4) on 18 April. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Batu Tara (Indonesia) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Batu Tara Sunda Volcanic Arc	Based on analysis of satellite imagery, the Darwin VAAC reported that during 15-16 April ash plumes from Batu Tara rose to altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted 35-75 km W and NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chaiten (Chile) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Chaiten Andean Southern Volcanic Arc	SERNAGEOMIN reported that during 12-16 April, seismicity from Chaitén's Domo Nuevo 1 and Domo Nuevo 2 lava-dome complex continued to increase. M 4-4.5 hybrid earthquakes occurred every 2-3 hours. Web camera views showed increased incandescence from the lava domes and gas-and-ash plumes that were wider at their base than previously seen. The plumes rose 1.5 km (4,900 ft) above the domes. The Alert Level remained at Red. Based on web camera views, analysis of satellite imagery, and a SIGMET notice, the Buenos Aires VAAC reported that during 16 and 18-19 April, ash plumes rose to altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted SE and N. Sources: Buenos Aires Volcanic Ash Advisory Center (VAAC), Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Karymsky (Russia) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Karymsky was not analyzed during 9-17 April due to technical reasons. Cloud cover prevented observations on the other days. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 15-21 April, HVO reported that lava flowed SE from underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex through a lava tube system, reaching the Waikupanaha and Kupapa'u ocean entries. Occasional explosions occurred from the Waikupanaha ocean entry. Surface flows were present on the coastal plain and at the base of the pali. The vent in Halema'uma'u crater continued to produce a white plume occasionally tinged brown that drifted mainly SW. Incandescence was intermittently seen from the vent, and sounds resembling rushing gas or rockfalls were sometimes heard in the vicinity of the crater. Pele's hair, tiny glass spheres, and ash were frequently retrieved from collection bins placed near the plume. The sulfur dioxide emission rate at the summit was elevated, reaching 700 tonnes per day on 15 April; the 2003-2007 average rate was 140 tonnes per day. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Koryaksky (Russia) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Koryaksky Eastern Kamchatka Volcanic Arc	During 10-17 April, KVERT reported that seismic activity at Koryaksky was above background levels. Gas-and-ash plumes were seen on satellite imagery and drifted 30-680 km in multiple directions. The Level of Concern Color Code remained Orange. Based on information from the Yelizovo Airport and analysis of satellite imagery, the Tokyo VAAC reported that during 18 and 21 April ash plumes rose to altitudes of 3.7-4.6 km (12,000-15,000 ft) a.s.l. and drifted S, SW, W, and NE. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Nevado del Huila (Colombia) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Nevado del Huila Andean Northern Volcanic Arc	During 15-21 April, INGEOMINAS reported that gas plumes from Nevado del Huila's lava dome, viewed through the web camera, rose to a maximum altitude of 6.9 km (22,600 ft) a.s.l. and drifted W. On 19 April, intense degassing observed during an overflight produced whitish and bluish plumes. Thermal anomalies were detected on the N and S parts of the dome. The Alert Level was at Yellow. Source: Servicio Geológico Colombiano (SGC)
Rabaul (Papua New Guinea) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Rabaul Bismarck Volcanic Arc	RVO reported that during 10-17 April white and gray plumes from Rabaul caldera's Tavurvur cone rose 1-2 km above the crater. Plumes drifted SE and NW. Occasionally, incandescence from the summit crater was seen at night and roaring noises were reported. Ashfall was reported in Rabaul town (3-5 km NW) and surrounding areas. Source: Rabaul Volcano Observatory (RVO)
Redoubt (United States) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Redoubt Alaska Peninsula Volcanic Arc	AVO reported that during 15-21 April seismicity from Redoubt remained above background levels, indicating ongoing growth of the lava dome in the summit crater. The web camera showed that vigorous steam-and-gas plumes that may have occasionally contained small amounts of ash rose from the vent to altitudes below 4.6 km (15,000 ft) a.s.l. Analysis of satellite imagery revealed thermal anomalies at the summit and drifting sulfur dioxide plumes. Based on photos and thermal images obtained on 16 April, the lava dome was estimated to be about 500 x 700 m across and at least 50 m thick. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Sheveluch (Russia) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Shiveluch was above background levels during 10-17 April. Based on interpretations of seismic data, ash plumes likely rose to altitudes of 4.5-7.5 km (14,800-24,600 ft) a.s.l. Analysis of satellite imagery revealed a daily thermal anomaly on the lava dome and ash plumes that drifted about 50 km NW on 13 April. According to observers, fumaroles were active on 15 and 16 April. The Level of Concern Color Code remained at Orange. Based on information from KEMSD, the Tokyo VAAC reported that eruptions on 19 and 22 April produced plumes that rose to altitudes of 4.6-5.2 km (15,000-17,000 ft) a.s.l. Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Suwanosejima (Japan) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported an explosion from Suwanose-jima on 21 April. Details of possible resultant ash plumes were not reported. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Tungurahua (Ecuador) | 15 April-21 April 2009 | Continuing ActivityCite this Report
Tungurahua Andean Northern Volcanic Arc	During 15-21 April, IG reported that clouds mostly prevented observations of Tungurahua; a steam-and-gas plume rose 100 m above the crater on 15 April and an ash plume rose 1 km above the crater and drifted NW on 18 April. Ashfall was reported in areas to the SW and N during 15-16 and 18-19 April. Roaring noises were occasionally heard. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,322 individual reports over 1,229 weeks (average of 17 per week) on 336 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.

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)