All times are local unless otherwise stated.

Mayon (Philippines) | 23 August-29 August 2006 | New Eruptive Activity Cite this Report
Mayon Eastern Philippine Volcanic Arc	According to PHIVOLCS and news reports, lava extrusion and associated rockfalls on the SE slopes of Mayon continued during 23-29 August. On 24 and 28 August, moderate gray-and-white plumes were observed drifting to the NE, SE, and WNW. Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), News Balita, Manila Bulletin, ABS-CBN News
Tungurahua (Ecuador) | 23 August-29 August 2006 | New Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	During 23-27 August, visual observations of Tungurahua were impaired due to inclement weather. Based on seismic interpretation, lava continued to slowly flow NW towards Cusúa and La Hacienda. Seismicity was low and dominated by long-period earthquakes. Inclinometer measurements indicated no additional inflation on the flanks. Several United Nations agencies and other organizations provided aid for an estimated 19,000 people that remained in shelters. Sources: ReliefWeb, Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Aira (Japan) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that eruptions at Sakura-jima on 22, 23, and 26 August generated plumes that rose to ~2.4 km (~8,000 ft) a.s.l. and drifted mainly SW. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	According to the Darwin VAAC, a diffuse ash plume from Dukono was visible on satellite imagery extending NNE on 23 August. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Activity at Karymsky continued during 23-29 August, with 30-100 shallow earthquakes occurring daily. Based on interpretations of seismic data, ash plumes reached altitudes of 3.5 km (11,500 ft) a.s.l. A thermal anomaly in the crater was observed on 23 August. Karymsky remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 23-29 August, lava from Kīlauea continued to flow off of a lava delta into the ocean at the East Laeʻapuki and East Kaʻiliʻili entries. Incandescence was visible from the East Pond and January vents, South Wall complex, and Drainhole vent in Puʻu ʻŌʻō's crater during the reporting period. Summit inflation S of Halemaʻumaʻu caldera continued. Tremor at Puʻu ʻŌʻō remained at a very typical moderate level. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Láscar (Chile) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Láscar Central Andean Volcanic Arc	Several small phreatic explosions occurred at Lascar during May, July, and August. The explosions were separated in time by up to several weeks. The last observed explosion, lasting for about five minutes on 14 August, produced a plume that reached a height of 450 m above the crater (19,800 ft a.s.l.) and dispersed ESE. Source: Jorge Clavero-Chilean Geological Survey (Sernageomin) and Juan Cayupi-Chilean Emergency Office (ONEMI) via the Volcano Listserv
Manam (Papua New Guinea) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Manam Bismarck Volcanic Arc	During 22-23 August, emissions from Manam consisted of dark brown-to-gray ash plumes that rose 1-2 km above the summit (9,200-12,500 ft a.s.l.) and drifted W and NW. The Darwin VAAC reported that eruption plumes were visible on satellite imagery on 23 and 26 August, extending NW. Ash was not identified in the imagery. Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)
Miyakejima (Japan) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Miyakejima Izu Volcanic Arc	The Tokyo VAAC reported that an eruption at Miyake-jima on 23 August generated plumes that reached altitudes of ~1.5 km (~5,000 ft) a.s.l. and drifted SE. Ash was not identified on satellite imagery. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Pacaya (Guatemala) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Pacaya Central America Volcanic Arc	The Washington VAAC reported that emissions from Pacaya with possible ash content were visible on satellite imagery on 28 August. The plumes reached altitudes of ~3 km (~10,000 ft) a.s.l. and drifted W. A thermal anomaly was identified on the imagery. Source: Washington Volcanic Ash Advisory Center (VAAC)
Semeru (Indonesia) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Semeru Sunda Volcanic Arc	According to the Darwin VAAC, ash plumes from Semeru were visible on satellite imagery on 25 August. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Soufrière Hills (United Kingdom) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	During 18-25 August, the Soufrière Hills lava dome continued to grow. A marked increase of long-period and hybrid earthquakes was noted from 18 to 20 August. Based on satellite imagery and reports from the MVO, the Washington VAAC reported that continuous emissions of ash and steam produced plumes that reached altitudes of 1.5 km (5,000 ft) a.s.l. on 28 August. Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
St. Helens (United States) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
St. Helens High Cascades Volcanic Arc	During 23-29 August, the lava dome at Mount St. Helens continued to grow and produce small rockfalls. The hazard status remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Suwanosejima (Japan) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that explosions from Suwanose-jima produced eruption plumes that rose straight up to 1.8 km (6,000 ft) a.s.l. on 26 August. On 28 August, eruption plumes rose to altitudes of 1.5 km (5,000 ft) a.s.l. and drifted E. Ash was not identified on satellite imagery. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Ubinas (Peru) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Ubinas Central Andean Volcanic Arc	Based on pilot reports and satellite imagery, the Buenos Aires VAAC reported continuous emissions of ash plumes from Ubinas during 23-29 August. The plumes reached altitudes of 4.9-7.6 km (16,000-25,000 ft) a.s.l. and drifted NE, SE, and S. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Ulawun (Papua New Guinea) | 23 August-29 August 2006 | Continuing Eruptive Activity Cite this Report
Ulawun Bismarck Volcanic Arc	The Darwin VAAC reported steam-and-ash plumes from Ulawun that were visible on satellite imagery on 25, 27, and 28 August. The plumes reached altitudes of 3.7 km (12,000 ft) a.s.l. and drifted NW, W, and SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Since the Weekly Volcanic Activity Report began in November 2000, there have been 22,859 individual reports over 1,335 weeks (average of 17 per week) on 351 different volcanoes.

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The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geological Summary, and a link to the GVP volcano profile page. At the end of each report is a list of the sources used. Each report includes a link from the volcano's name back to the more complete information on the GVP website.

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Criteria

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 essentially continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Submarine activity is reported when information is available. 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.

Reports categorized as "Activity (New)" indicate eruptive activity that has occurred after at least 3 months of quiescence. Once a volcano is included in this section, updates will remain on that list unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Activity (Continuing)" section. Reports are included in the "Unrest" sections (New or Continuing) if the volcano is undergoing non-eruptive activity such as seismicity or deformation that is unusually high for that volcano or is increasing. The "Other" category includes non-eruptive and non-unrest reports, such as Alert Level decreases or previous ash deposits resuspended by winds. Reports through 2025 were only divided into "New Activity/Unrest" and "Continuing Activity", which have been automatically converted to the "Activity (New)" and "Activity (Continuing)" groups, respectively, without a review of content that might change the category to "Unrest" or "Other".

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 have the relevant information at the time.

Disclaimers

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. 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.

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