All times are local unless otherwise stated.

Bezymianny (Russia) | 16 May-22 May 2007 | New Activity / Unrest Cite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	KVERT reported on 17 May that the Level of Concern Color Code for Bezymianny was lowered to Yellow. Satellite imagery showed that the thermal anomaly decreased in size during 15-17 May. Hunters reported that a large mudflow, 200 m in width, moved along the Sukhaya Khapitsa river on 17 May. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Bulusan (Philippines) | 16 May-22 May 2007 | New Activity / Unrest Cite this Report
Bulusan Eastern Philippine Volcanic Arc	PHIVOLCS reported on 20 May that seismicity from Bulusan remained high following the explosion on 12 May. Ground deformation measurements conducted on 17 May on the NE flank revealed 4 mm of inflation compared to the previous measurement on 7 April. The Alert Level was raised from 1 to 2 (out of 5) due to the increased seismicity and inflation. Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Klyuchevskoy (Russia) | 16 May-22 May 2007 | New Activity / Unrest Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that during 11-22 May, seismic activity at Kliuchevskoi continued above background levels and a thermal anomaly in the crater was detected on satellite imagery. According to video data and visual observations, Vulcanian activity at the terminal crater and phreatic bursts at the NW flank of the volcano were observed on 11 and 16 May. Also on 11 and 16 May, ash plumes rose to 9.7 km (31,800 ft) a.s.l. and drifted E and NE, respectively. Clouds inhibited observation on other days. Ashfall was reported from the town of Klyuchi, about 30 km to the NE, during 11-12 and 16-17 May. KVERT raised the Level of Concern Color Code from Orange to Red on 17 May. On 18 May, KVERT reported that deposits from a mudflow filled the Krivaya river. During 18-22 May, ash plumes rose to an altitude of 8.5 km (27,900 ft) a.s.l. Based on observations from satellite imagery, ash plumes drifted N, NE, NW, and E during 11-22 May. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Ritter Island (Papua New Guinea) | 16 May-22 May 2007 | New Activity / Unrest Cite this Report
Ritter Island Bismarck Volcanic Arc	According to a news article, "sea surges" destroyed four homes and a boat following an eruption of Ritter Island on 19 May. About 1,500-2,000 people on Siassi Island moved to higher ground. Villagers reported seeing plumes from the island, hearing rumbling noises, and feeling earthquakes. The article also mentioned that RVO and the Geophysical Observatory in Port Moresby did not record any seismic activity from the eruption. Source: Australian Associated Press

Aira (Japan) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA and a pilot report, the Tokyo VAAC reported that ash plumes from Sakura-jima rose to altitudes of 1.2-2.7 km (4,000-9,000 ft) a.s.l. during 16 and 20-22 May. Plumes drifted NW on 16 May and rose straight up during 20-22 May. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Bagana (Papua New Guinea) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Bagana Solomon Volcanic Arc	RVO reported that white vapor emissions from Bagana's summit crater continued during 10 March-20 May. Emissions were occasionally forceful, and were accompanied by ash clouds during 17 March, 1 April, and 3-5 April. Weak roaring noises were heard on 4 April. Summit incandescence was visible on 20 and 24 March and 17 May. Based on satellite imagery and information from RVO, the Darwin VAAC reported that a diffuse plume rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted SW on 20 May. RVO reported that forceful, white emissions on 21 May produced plumes to an altitude of 2.3 km (8,200 ft) a.s.l. and drifted W. Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)
Home Reef (Tonga) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Home Reef Tofua Volcanic Arc	Pumice from the Home Reef eruption that began early-to-mid August 2006 reached the eastern Australian coast in March 2007. A substantial stranding of the pumice in mid-April extended for more than 1,300 km along the Queensland and northern New South Wales coast. Pumice clasts ranged in size from 1-4 cm in diameter, with the largest clasts up to 17 cm in diameter. A visit to the area in February 2007 revealed a pumice mound barely visible over the waves. Source: Scott Bryan, School of Earth Sciences and Geography, Kingston University
Kilauea (United States) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 16-22 May, lava from Kilauea continued to flow SE across a lava delta into the ocean at the Kamokuna entry. On 16 May, lava from the E arm of the Campout flow advancing along the coastal plain from the base of the Royal Gardens sub-division, reached the ocean at the newly-formed Poupou entry. On 18 May, field crews reported that the Poupou entry, about 1.6 km E of the Kamokuna entry, was 20 m wide and building a delta. 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 that initially increased on 12 May was scattered beneath the upper rift zone and S-flank areas. According to a news article, new measurements revealed that the area of the 10 May bench collapse at East Lae'apuki lava delta was about 9.3 hectares (23 acres). Scientists reported that new cracks in the lava delta were observed within several hundred yards of the ocean's edge. Sources: Honolulu Advertiser, US Geological Survey Hawaiian Volcano Observatory (HVO)
Reventador (Ecuador) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Reventador Northern Andean Volcanic Arc	On 16 May, IG reported that a steam plume from Reventador rose to an altitude of 3.6 km (11,900 ft) a.s.l. and drifted to the NW. The plume was visible on satellite imagery. On 18 May, strong rains resulted in a lahar that lasted approximately 40 minutes. A lahar was also noted on 22 May. Visual observations were hindered during most of the reporting period due to inclement weather. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Sheveluch (Russia) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Shiveluch continued above background levels during 11-18 May. Based on seismic interpretation, ash plumes possibly rose to an altitude of 6 km (19,700 ft) a.s.l. throughout the reporting period. A large thermal anomaly was visible on satellite imagery. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufriere Hills (United Kingdom) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Soufriere Hills Lesser Antilles Volcanic Arc	Based on visual observations, MVO reported that during 11-21 May lava-dome growth at Soufrière Hills likely ceased and the overall structure of the dome changed very little. Low-level rockfall and pyroclastic flow activity continued. Seismic activity was very low. The Alert Level remained at 4 (on a scale of 0-5). Source: Montserrat Volcano Observatory (MVO)
St. Helens (United States) | 16 May-22 May 2007 | Continuing ActivityCite this Report
St. Helens High Cascades Volcanic Arc	Data from deformation-monitoring instruments indicated that during 16-22 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)
Tungurahua (Ecuador) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Tungurahua Northern Andean Volcanic Arc	During 15-22 May, IG reported that ash plumes intermittently visible from Tungurahua rose to altitudes of 5.1-7 km (16,700-23,000 ft) a.s.l. and drifted mainly W, NW, and E. Ashfall was reported from areas SW and W during 16-17 May, SW on 19 May, and W and NW during 20-21 May. Lahars and muddy waters traveled down W, NW, and N ravines during 15 and 17-19 May and caused the road to Baños to close on 18 May. Lahars that traveled in the Bilbao sector and down NW ravines on 20 May blocked the Baños-Penipe highway and obstructed the route between Ambato and Baños for about 6 hours. Muddy waters traveled down ravines to the N. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ubinas (Peru) | 16 May-22 May 2007 | Continuing ActivityCite this Report
Ubinas Central Andean Volcanic Arc	INGEMMET reported that during 16-17 May, ash and gas plumes from Ubinas rose to altitudes of 5.8-7.7 km (19,000-25,300 ft) a.s.l. and drifted SW, SE, and E. Based on pilot reports and satellite imagery, the Buenos Aires VAAC reported that continuous emissions produced ash plumes that rose to altitudes of 5.6-9.1 km (18,000-30,000 ft) a.s.l. during 17 and 19-22 May. Plumes drifted ESE, SE, and E. 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 21,204 individual reports over 1,267 weeks (average of 17 per week) on 339 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)