All times are local unless otherwise stated.

Concepcion | 11 April-17 April 2007 | New Activity / Unrest Cite this Report
Concepcion Nicaragua	INETER reported that explosions in the crater of Concepción on 8 April produced an ash-and-gas plume that rose to an altitude of 2.7 km (8,900 ft) a.s.l. and drifted W. Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
Etna | 11 April-17 April 2007 | New Activity / Unrest Cite this Report
Etna Sicily (Italy)	A summit eruption that occurred at Etna on 11 April began with an increase in volcanic tremor and was followed by lava fountaining. A resultant ash plume drifted E; ashfall was reported as far as Zafferana, about 10 km to the E. Two lava flows were observed at the summit of Etna, one towards the E within the Valle del Bove, and the second to the S. The E lava flow stopped 3 km away at the base of the Serra Giannicola Grande, within the W Valle del Bove. The second flow stopped near Mt. Frumento Supino (less than 1 km S of the summit). The INGV-CT monitoring web cameras showed that the eruption lasted about 5 hours. Source: Sezione di Catania - Osservatorio Etneo (INGV)
Nevado del Huila | 11 April-17 April 2007 | New Activity / Unrest Cite this Report
Nevado del Huila Colombia	According to the Washington VAAC, a pilot reported an ash plume from Nevado del Huila on 17 April. An ash plume that was evident on satellite imagery at 0415 rose to an approximate altitude of 11.3 km (37,000 ft) a.s.l. and drifted E. An additional plume drifted SW. Later that day, INGEOMINAS reported increased seismicity. At 0257 on 18 April, INGEOMINAS reported an eruptive event. Based on a news article, an eruption triggered landslides and swelled rivers. About 5,000 people evacuated from areas to the S. Sources: Washington Volcanic Ash Advisory Center (VAAC), Servicio Geológico Colombiano (SGC), Mail and Guardian Online
Piton de la Fournaise | 11 April-17 April 2007 | New Activity / Unrest Cite this Report
Piton de la Fournaise Reunion Island (France)	OVPDLF reported that the eruption of Piton de la Fournaise from the S-part of Grand Brûlé continued during 11-17 April. On 12 and 13 April, strong seismicity was followed by emissions; a gray plume from the summit of Dolomieu crater drifted NW. Also on 13 April, lava fountaining increased and resulted in several broad lava flows moving towards the sea. On 14 April, projected material reached 100-200 m above the point of emission. Sources: Observatoire Volcanologique du Piton de la Fournaise (OVPF), Observatoire Volcanologique du Piton de la Fournaise (OVPF)
Reventador | 11 April-17 April 2007 | New Activity / Unrest Cite this Report
Reventador Ecuador	On 11 April, a steam plume from Reventador rose to an altitude of 3.8 km (12,500 ft) a.s.l. Visual observations were hindered during 12-17 April due to inclement weather. On 13 April, the lava flow on the S flank, first observed on 28 March, was 15 m thick and possibly active. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Batu Tara | 11 April-17 April 2007 | Continuing ActivityCite this Report
Batu Tara Komba Island	Based on satellite imagery and direct observations by CVGHM, the Darwin VAAC reported that on 11 April a diffuse plume from Batu Tara rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted W. On 17 April, CVGHM lowered the Alert Level from 3 to 2 (on a scale of 1-4). Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
Colima | 11 April-17 April 2007 | Continuing ActivityCite this Report
Colima Mexico	Multiple steam and gas-and-ash plumes were observed from Colima during 11-12 and 15-16 April. Based on satellite imagery and the Mexico City MWO, the Washington VAAC reported that on 12 April continuous ash-and-steam emissions from Colima produced an ash plume that rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted W. Sources: Washington Volcanic Ash Advisory Center (VAAC), Gobierno del Estado de Colima
Karymsky | 11 April-17 April 2007 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka (Russia)	Seismic activity at Karymsky was above background levels during 10-13 April. Ash plumes from explosions may have reached altitudes of 4 km (13,000 ft) a.s.l. during the reporting period. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea | 11 April-17 April 2007 | Continuing ActivityCite this Report
Kilauea Hawaiian Islands (USA)	On 11 April, lava from the E arm of Kilauea's Campout flow at the base of the long-abandoned Royal Gardens ignited fires within the subdivision. During 11-17 April, lava continued to flow across a lava delta into the ocean at the Kamokuna entry, but lava was not seen entering the ocean at East Lae'apuki. Incandescence was intermittently visible from several breakouts on the Pulama pali and from several vents in the Pu'u 'O'o crater. Earthquake activity was scattered at the summit and S-flank areas. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy | 11 April-17 April 2007 | Continuing ActivityCite this Report
Klyuchevskoy Central Kamchatka (Russia)	Seismic activity at Kliuchevskoi continued above background levels during 10-13 April. Based on observations and video data, lava flowed down the NW flank and Strombolian activity occurred at the crater. Everyday during 10-13 April a gas-and-steam plume possibly containing a small amount of ash rose to an altitude of 6.3 km (20,700 ft) a.s.l. and drifted E. A thermal anomaly in the crater was detected on satellite imagery during 10-12 April. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Rabaul | 11 April-17 April 2007 | Continuing ActivityCite this Report
Rabaul New Britain (Papua New Guinea)	RVO reported that during 10-17 April, Rabaul caldera's Tavurvur cone emitted steam and steam-and-ash plumes that rose to 1.1-2.7 km (3,600-8,900 ft) a.s.l. and drifted S and SE. Weak roaring noises occasionally accompanied the emissions. Small amounts of incandescent material were ejected from the crater during 13-15 April. Source: Rabaul Volcano Observatory (RVO)
Santa Maria | 11 April-17 April 2007 | Continuing ActivityCite this Report
Santa Maria Southwestern Guatemala	INSIVUMEH reported that explosions from Santa María's Santiaguito lava dome complex occasionally produced ash plumes that rose to altitudes of 5.3 km (17,400 ft) a.s.l. and drifted E on 11 and 16 April. Lava-flow fronts on the SW flanks of Caliente Dome emitted gases on 11 April and produced avalanches of block and ash on 16 April. On 13 April, the Washington VAAC reported that an ash plume was visible on satellite imagery drifting W. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch | 11 April-17 April 2007 | Continuing ActivityCite this Report
Sheveluch Central Kamchatka (Russia)	Seismic activity at Shiveluch continued above background levels during 4-10 April. Based on seismic interpretation, observation, and video data, possible ash-and-steam plumes rose to altitudes of 4.5-7 km (14,800-23,000 ft) a.s.l. throughout the reporting period. Based on satellite imagery during 10-12 April, plumes drifted N, NW, SE, and SW and a thermal anomaly was present. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufriere Hills | 11 April-17 April 2007 | Continuing ActivityCite this Report
Soufriere Hills Montserrat	Based on visual observations, lava-dome growth at Soufrière Hills continued at a reduced rate during 6-13 April. Material originating from the E-facing shear lobe was shed down the Tar River Valley. Minor rockfalls and pyroclastic flows were noted. On 17 April, a small pyroclastic flow was observed to the NW in the upper part of Tyres Ghaut. The lava-dome volume was an estimated 208 million cubic meters. Source: Montserrat Volcano Observatory (MVO)
St. Helens | 11 April-17 April 2007 | Continuing ActivityCite this Report
St. Helens Washington	Data from deformation-monitoring instruments and observations from a remote camera showed that during 11-17 April lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5 and occasionally larger earthquakes. Clouds occasionally inhibited visual observations. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Tungurahua | 11 April-17 April 2007 | Continuing ActivityCite this Report
Tungurahua Ecuador	IG reported that based on visual observations and reports from pilots, ash plumes from Tungurahua rose to altitudes of 6.7-8 km (22,000-26,200 ft) a.s.l. and drifted NNW on 11 April. Fumarolic activity originated from the NE and E edges of the crater. During 12-17 April, ash plumes, occasionally accompanied by roaring, rose to altitudes of 5.8-8 km (19,000-26,200 ft) a.s.l. and drifted mainly W. Ashfall was reported from areas downwind on 12 April. During 13-14 April, Strombolian activity was observed; incandescent material was ejected about 200-300 m above the summit and blocks descended 500-800 m down the flanks. During 15-17 April, lahars descended several NW, W, and SW valleys. In the Pampas sector, lahars with blocks 50 cm in diameter disrupted the roads between Ambato and Baños, and between Baños and Penipe. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ubinas | 11 April-17 April 2007 | Continuing ActivityCite this Report
Ubinas Peru	Based on a significant meteorological notice (SIGMET), the Buenos Aires VAAC reported that an ash plume from Ubinas rose to altitudes of 5.5-7 km (26,000-27,000 ft) a.s.l. on 10 April and drifted W. INGEMMET reported that on 11 April, emissions of gas and ash produced plumes to altitudes of 6.2-6.4 km (20,000-21,000 ft) a.s.l. and drifted E. Based on an additional SIGMET, the Buenos Aires VAAC reported that an ash plume rose to altitudes of 6.1-6.4 km (20,000-21,000 ft) a.s.l. and drifted SE. Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Buenos Aires Volcanic Ash Advisory Center (VAAC)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 19,584 individual reports over 1,195 weeks (average of 16 per week) on 332 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)