All times are local unless otherwise stated.

Etna (Italy) | 2 May-8 May 2007 | New Activity / Unrest Cite this Report
Etna Sicily Volcanic Province	A summit eruption that occurred at Etna on 29 April began with an increase in volcanic tremor and was followed by lava fountaining and a vertical ash plume. Lava flows traveled E within the Valle del Bove. The INGV-CT monitoring web cameras showed that the eruption lasted about 8-9 hours. Source: Sezione di Catania - Osservatorio Etneo (INGV)
Lopevi (Vanuatu) | 2 May-8 May 2007 | New Activity / Unrest Cite this Report
Lopevi Vanuatu Volcanic Arc	Based on a pilot report, the Wellington VAAC reported that an ash plume from Lopevi rose to an altitude of 2.1 km (7,000 ft) a.s.l. on 3 May. Source: Wellington Volcanic Ash Advisory Center (VAAC)
Piton de la Fournaise (France) | 2 May-8 May 2007 | New Activity / Unrest Cite this Report
Piton de la Fournaise Reunion Hotspot Volcano Group	OVPDLF reported that the eruption of Piton de la Fournaise ceased on 1 May. During 2-7 May, seismicity continued at and below the summit, and also indicated a large number of landslides from Dolomieu crater walls. On 3 May, OVPDLF reported that in total, lava flows up to 30-40 m thick covered an estimated four square kilometers. The total estimated erupted volume was 120 million cubic meters, making this event one of the largest known historical eruptions of Piton de la Fournaise. Recent more accurate measurements indicated that Dolomieu crater collapsed to a depth of 350-360 m. Sources: Observatoire Volcanologique du Piton de la Fournaise (OVPF), Observatoire Volcanologique du Piton de la Fournaise (OVPF)
Turrialba (Costa Rica) | 2 May-8 May 2007 | New Activity / Unrest Cite this Report
Turrialba Central America Volcanic Arc	On 6 May, scientists from OVSICORI declared a Low Alert Level for Turrialba based on rapid changes during the previous three months, and intensified their fieldwork and data collection efforts. During aerial observation in February 2007, trees looked yellowish due to sustained gas emissions from the W crater. Vegetation growth was noted in previously burned areas on the W and SW flanks near the summit. On 21 April, a hot area (40° C) was noted 1.5 km SW of the summit, at the base of the volcanic edifice, that coincides with the WSW-ENE-trending Ariete fault. On 2 May, two larger hot and fuming spots were documented along the same fault, about 200 m SW of the first area. The vapor plumes were spotted from several kilometers away, above the forest canopy. Heat destroyed vegetation in an approximately 300 square m area along the S fault's plane. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Ambrym (Vanuatu) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Ambrym Vanuatu Volcanic Arc	The Wellington VAAC reported that a pilot observed an ash plume from Ambrym on 3 May. The plume rose to an altitude of 1.8 km (6,000 ft) a.s.l. and drifted SE. Ash was visible on satellite imagery. Source: Wellington Volcanic Ash Advisory Center (VAAC)
Batu Tara (Indonesia) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Batu Tara Sunda Volcanic Arc	Based on satellite imagery and CVGHM, the Darwin VAAC reported that a diffuse ash plume from Batu Tara drifted W on 5 May. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Seismic activity at Karymsky was above background levels during 27 April-4 May. A thermal anomaly was visible on satellite imagery; ash plumes were absent. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 2-8 May, lava from Kilauea continued to flow SE across a lava delta into the ocean at the Kamokuna entry. Incandescence was visible from several vents in the Pu'u 'O'o crater and from breakouts on, above, and at the base of the Pulama pali fault scarp. Earthquake activity was scattered at the summit, upper E rift zone, and S-flank areas. Tremor remained at moderate levels. During 3-4 May, large channelized a'a' flows descended down the pali on the Campout flow. On 4 May, a sheet flow ponded lava at the base of the Royal Gardens sub-division. On 8 May, HVO scientists reported that for the past several months, Kilauea caldera widened at a rate of 1.5 cm/month and Pu'u 'O'o cone was slowly collapsing, as indicated by new cracks on the S flank. Subsidence of the cone's N flank at a rate of 1 cm/month was also measured. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	Based on observations and video data, KVERT reported that Strombolian activity occurred at Kliuchevskoi during 27 April-4 May. Seismic activity continued above background levels and a thermal anomaly in the crater was detected on satellite imagery. Mudflows and lava flows continued to advance on the NW flank. Phreatic activity and ash plumes from lava-flow fronts were noted. Gas-and-steam plumes containing ash rose to altitudes of 6.2 km (20,400 ft) a.s.l. during the reporting period and were visible on satellite imagery drifting S and SE. Based on information from KVERT, the Tokyo VAAC reported that ash plumes rose to an altitude of 5.2 (17,000 ft) a.s.l. and drifted NE on 3 May. According to a news article, an ash plume rose to altitudes of 5.3-5.5 km (17,400-18,000 ft) a.s.l. and drifted NE on 7 May. Ashfall was reported from the town of Klyuchi, about 30 km to the NE. The Level of Concern Color Code remained at Orange. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Itar-Tass News, Kamchatkan Volcanic Eruption Response Team (KVERT)
Manam (Papua New Guinea) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Manam Bismarck Volcanic Arc	RVO reported that Manam's Main Crater and South Crater occasionally released white vapor plumes during 1-5 May. Weak incandescence was visible from Main Crater on 2 and 4 May. Seismicity was at low levels. Based on information from RVO and satellite imagery, the Darwin VAAC reported that a diffuse plume drifted W on 6 May. Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Rabaul Volcano Observatory (RVO)
Rabaul (Papua New Guinea) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Rabaul Bismarck Volcanic Arc	RVO reported that during 29-30 April, ash emissions from Rabaul caldera's Tavurvur cone generated plumes that rose to an altitude of 1.2 km (3,900 ft) a.s.l. and drifted W. During 1-2 May, ash plumes drifted NNW; ashfall was reported from Rabaul town and surrounding areas. Occasional roaring noises were heard and incandescence was observed at night. Source: Rabaul Volcano Observatory (RVO)
Sangay (Ecuador) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Sangay Andean Northern Volcanic Arc	Based on pilot observations, the Washington VAAC reported that an ash plume from Sangay rose to altitudes of 5.2-7.6 km (17,000-25,000 ft) a.s.l. on 4 May. On 5 May, a possible narrow ash plume was visible on satellite imagery drifting W. Source: Washington Volcanic Ash Advisory Center (VAAC)
Semeru (Indonesia) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Semeru Sunda Volcanic Arc	Based on satellite imagery and information from CVGHM, the Darwin VAAC reported diffuse ash plumes from Semeru at an altitude of 4.6 (15,000 ft) a.s.l. during 3-5 May. The plumes drifted SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sheveluch (Russia) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Shiveluch continued above background levels during 27 April-4 May. Based on seismic interpretation, observation, and video data, ash-and-steam plumes possibly rose to altitudes of 4-10 km (13,100-32,800 ft) a.s.l. throughout the reporting period. Plumes were seen on satellite imagery drifting S and SW during 28-29 April and a thermal anomaly was present during 27 April-4 May. Based on visual and video data, hot avalanches originating from the lava dome were observed on 30 April. Based on information from the KEMSD, the Tokyo VAAC reported that an ash plume rose to an altitude of 4.9 km (16,000 ft) a.s.l. on 7 May. The Level of Concern Color Code remained at Orange. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Itar-Tass News, Kamchatkan Volcanic Eruption Response Team (KVERT)
St. Helens (United States) | 2 May-8 May 2007 | Continuing ActivityCite this Report
St. Helens High Cascades Volcanic Arc	Data from deformation-monitoring instruments indicated that during 2-8 May lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. In some instances, clouds inhibited visual observations. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Suwanosejima (Japan) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported explosions from Suwanose-jima on 8 May. Ash was not visible on satellite imagery. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Tungurahua (Ecuador) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Tungurahua Andean Northern Volcanic Arc	IG reported that lahars and muddy waters that traveled into the Pampas sector and in W and NW ravines blocked the Baños - Penipe highway during parts of 3, 4, and 6 May. During 2-3 and 5-7 May, ash plumes from Tungurahua rose to altitudes of 5.2-7 km (17,100-23,000 ft) a.s.l. and drifted NW and W. Ashfall was reported in areas about 8 km to the SW and W during 3, 6, and 7 May. The Washington VAAC reported that a diffuse ash plume was visible on satellite imagery drifting W on 8 May. Clouds occasionally inhibited visual observations during the reporting period. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ubinas (Peru) | 2 May-8 May 2007 | Continuing ActivityCite this Report
Ubinas Andean Central Volcanic Arc	Based on pilot reports and satellite imagery, the Buenos Aires VAAC reported that ash plumes from Ubinas rose to altitudes of 5.5-9.1 km (18,000-30,000 ft) a.s.l. during 2-5 May. Plumes drifted NE, S, SE, and SW. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)

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.

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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)