All times are local unless otherwise stated.

Merapi (Indonesia) | 5 July-11 July 2006 | New Activity / Unrest Cite this Report
Merapi Sunda Volcanic Arc	Gas plumes were observed during 5-11 July at Merapi and reached a maximum height of 1.2 km above the summit (3,600 ft a.s.l.) on 6 July. Due to a decrease in activity, on 10 July the Alert Level was lowered one level to 3 (on a scale of 1-4) in all areas except the S slope. Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Agence France-Presse (AFP)
Soufriere Hills (United Kingdom) | 5 July-11 July 2006 | New Activity / Unrest Cite this Report
Soufriere Hills Lesser Antilles Volcanic Arc	The Montserrat Volcano Observatory estimated that the Soufrière Hills lava dome volume was 27 million cubic meters on 27 June, prior to the 30 June partial lava-dome collapse, which means the growth rate during the month of June averaged about 8 cubic meters per second. On 7 July, the Alert Level was lowered to 3 (on a scale of 0-5). Source: Montserrat Volcano Observatory (MVO)
Sulu Range (Papua New Guinea) | 5 July-11 July 2006 | New Activity / Unrest Cite this Report
Sulu Range Bismarck Volcanic Arc	On 10 July, the RVO reported that "forceful, dark emissions" from the Sulu Range were observed on 7 July and decreased to moderate emissions by the morning of 8 July. On 12 July, aerial inspection confirmed that emissions were coming from a NW-S-trending area between Ubia and Ululu volcanoes. The report also indicated that weak to moderate white vapor emissions were observed on 10 through 12 July and seismic activity had increased in intensity and frequency from 6 July. Loud booming and rumbling noises were accompanied by strong tremor picked up at stations at Garbuna and Ulawun volcanoes. On 11 July it was reported that there was no evidence of ash emission and that three villages north of Mount Karai had been evacuated. A large earthquake (intensity of ~7) occurred on 12 July at 0820 that disturbed the shoreline and caused the sea water to become sediment-laden. Local rivers turned muddy due to continuous ground shaking. Reports of vegetation die-off from late February had not been confirmed due to lack of resources. The Sulu Range has not been active in historical times. Source: Rabaul Volcano Observatory (RVO)

Colima (Mexico) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Belt	Based on information from the Mexico City MWO, the Washington VAAC reported an ash emission from Colima on 8 July to an unknown height. Ash was not visible on satellite imagery. Source: Washington Volcanic Ash Advisory Center (VAAC)
Karymsky (Russia) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Based on interpretations of seismic data from Karymsky during 1-7 July, ash plumes reached altitudes of 4 km (13,100 ft) a.s.l. According to the Tokyo VAAC, the Kamchatkan Experimental and Methodical Seismological Department (KEMSD) reported that on 10 July ash plumes reached altitudes of ~5.2 km (17,000 ft) a.s.l. Approximately 100-350 shallow earthquakes occurred daily during 29 June-3 July and increased to 1000 per day during 4-5 July. A thermal anomaly in the crater was observed on 30 June, 1 July, and 6 July. Karymsky remained at Concern Color Code Orange. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 5-11 July, lava from Kilauea continued to flow off of a lava delta into the ocean at the East Lae`apuki entry. Background volcanic tremor was at normal levels at Kilauea's summit, with small shallow earthquakes occurring. Volcanic tremor remained at a very typical moderate level at Pu`u `O`o. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Lopevi (Vanuatu) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Lopevi Vanuatu Volcanic Arc	Based on pilot reports, the Wellington VAAC reported that an eruption plume from Lopevi on 5 July reached an unknown altitude and smoke-and-ash plumes on 8 and 9 July reached altitudes of 3.7 km (12,000 ft) a.s.l. and drifted E and SE, respectively. Source: Wellington Volcanic Ash Advisory Center (VAAC)
Pacaya (Guatemala) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Pacaya Central America Volcanic Arc	A white- and blue-colored "smoke" plume from Pacaya was observed on 5 and 7 July and drifted NW and W, and a white gas cloud on 10 July reached 800 m above the crater (11,000 ft a.s.l.) and drifted SW. Lava flows toward the NW reached lengths of 800 m. Incandescence was observed on 7 July. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Semeru (Indonesia) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Semeru Sunda Volcanic Arc	According to the Darwin VAAC, an ash plume from Semeru reached a maximum altitude of 5.5 km (18,000 ft) a.s.l. on 10 July. The plume was visible on satellite imagery. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
St. Helens (United States) | 5 July-11 July 2006 | Continuing ActivityCite this Report
St. Helens High Cascades Volcanic Arc	During 5-11 July, the lava dome at Mount St. Helens continued to grow at a slow and steady rate producing small rockfalls. The hazard status remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Tungurahua (Ecuador) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Tungurahua Andean Northern Volcanic Arc	During 5-11 July, seismic activity indicating explosions increased at Tungurahua. Incandescent blocks were ejected from the crater during 5 to 8 July, when blocks rolled approximately 1 km down the NW flank. Ash-and-steam plumes with moderate to no ash content were observed to reach maximum heights of 2.5 km above the summit (24,700 ft a.s.l.) and drifted generally to the W and NW. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ubinas (Peru) | 5 July-11 July 2006 | Continuing ActivityCite this Report
Ubinas Andean Central Volcanic Arc	According to the Buenos Aires VAAC, a pilot reported that ash plumes from Ubinas on 8 and 9 July reached altitudes of 5.5 km (18,000 ft) a.s.l. and drifted NW. Ash plumes were visible on satellite imagery during 8-10 July. 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.

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)