All times are local unless otherwise stated.

Ubinas (Peru) | 31 May-6 June 2006 | New Eruptive Activity Cite this Report
Ubinas Central Andean Volcanic Arc	On 3 June, the Alert Level for Ubinas was increased to Orange due to heightened explosive activity. During 31 May to 5 June, ash plumes reached altitudes of 7.9 km (26,000 ft) a.s.l. and drifted N, NE, SE, and S. According to a news report, on 5 June, officials in S Perú prepared to evacuate approximately 480 families. Sources: Buenos Aires Volcanic Ash Advisory Center (VAAC), Dominican Today
Aira (Japan) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	On 4 and 5 June, intermittent eruptions at Sakura-jima, from an upper E-flank vent, near or within the 1946 vent, produced ash clouds that reached unknown heights. No ash was visible on satellite imagery. This was the first reported Sakura-jima eruption from a vent outside the summit crater in 58 years. The 1946 vent was the source of major lava flows that reached the E and S coasts of the former island. Sources: Yukio Hayakawa, Gunma University, Reuters
Bulusan (Philippines) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Bulusan Eastern Philippine Volcanic Arc	PHIVOLCS reported that an ash-and-steam cloud emitted from Bulusan on 31 May reached a height of 1.5 km above the summit (10,100 ft a.s.l.). Light ashfall, from trace amounts to 1.5 mm thickness, fell in areas W and NW of the volcano. Bulusan remained at Alert Level 1, with a Permanent Danger Zone of 4 km around the summit. Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), The Manila Times
Karthala (Union of the Comoros) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Karthala Madagascar-Comoros Volcanic Province	According to news articles, eruptive activity at Karthala that occurred on 28 May had ceased. No seismic activity was detected during 31 May to 1 June. Sources: Reuters, Agence France-Presse (AFP)
Karymsky (Russia) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	During 27 May to 2 June, ash explosions from the summit of Karymsky continued. A large thermal anomaly in the crater was observed during 27-31 May. KVERT warned that activity from the volcano could affect nearby low-flying aircraft. Karymsky remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 31 May to 5 June, lava from Kīlauea continued to flow off of a lava delta into the ocean at the East Laeʻapuki entry. Incandescence was visible from East Pond Vent, January Vent, Drainhole, and South Wall Complex when weather permitted observations. Incandescence high up on the PKK lava tube was observed on 4 June from the ground and by GOES satellite. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Merapi (Indonesia) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Merapi Sunda Volcanic Arc	The Alert Level at Merapi remained at 4, the highest level, during 31 May to 6 June. Sulfur-dioxide plumes were observed daily during this period and reached a height of 1.3 km above the summit (13,900 ft a.s.l.) on 1 June. According to the Darwin VAAC, low-level emissions were visible on satellite imagery on 1 and 6 June. Multiple pyroclastic flows reached a maximum distance of 4 km SE toward the Gendol River and 3.5 km SW toward the Krasak and Boyong Rivers. CVGHM reported on 31 May that lava avalanches moved towards the W for the first time during the recent eruption. According to a volcanologist in Yogyakarta, lava-flow distances and lava-dome volume had both approximately doubled since the 27 May M 6.2 earthquake. The lava-dome volume was estimated at 4 million cubic meters. On 6 June, groups living near the base of the volcano began to move into temporary shelters. Activities remain restricted within a 7 km radius from the volcano's summit and within 300 m of the banks of Krasak/Bebeng, Bedog, and Boyong Rivers to the SW, and Gendol River to the SE. Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Agence France-Presse (AFP), Darwin Volcanic Ash Advisory Centre (VAAC), Associated Press
Semeru (Indonesia) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Semeru Sunda Volcanic Arc	According to the Darwin VAAC, a pilot reported multiple minor eruptions from Semeru on 4 June. Small ash plumes were detected on satellite imagery on 5-6 June. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Soufrière Hills (United Kingdom) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	During 26 May to 2 June, the Soufrière Hills lava dome continued to grow at a high rate of 10 cubic meters per second (average growth rate during January-April was 6 cubic meters per second). Numerous rockfalls and vigorous ash venting occurred from a vent to the W of the lava dome. A pilot reported that a small ash plume extended NW on 31 May. Ash plumes extending W and NW were visible on satellite imagery during 1-5 June and reached a maximum altitude of 2.7 km (9,000 ft) a.s.l. on 3 and 5 June. An ash plume on 4 June extended N of Puerto Rico. According to the Washington VAAC, ash-plume emissions continued during 24-30 May. On 24 May, emission of small volumes of gas and thin ash plumes continued and drifted W and SW. A pilot near St. Croix (NW) reported that the ash/haze layer reached an altitude of 1.5 km (5,000 ft) a.s.l. Ashfall was reported at San Juan (NW) airport. During 25-30 May, ash plumes reached an altitude of 4.6 km (15,000 ft) a.s.l. and drifted W and NW. On 24-26 May, a hot spot was visible on infrared satellite imagery. Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
St. Helens (United States) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
St. Helens High Cascades Volcanic Arc	During 31 May to 6 June, seismic signals indicated the lava spine continued to grow inside the crater of Mount St. Helens and occasionally produced minor rockfalls. The volcano remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Tungurahua (Ecuador) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	During 3-5 June, small-to-moderate explosions at Tungurahua produced plumes composed of gas, steam, and small amounts of ash. On 5 June, light ashfall was reported in areas on the SW flank. Night-time incandescence was observed on 3 and 5 June. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ulawun (Papua New Guinea) | 31 May-6 June 2006 | Continuing Eruptive Activity Cite this Report
Ulawun Bismarck Volcanic Arc	On 31 May, a thin steam-and-ash plume from Ulawun reached an altitude of below 3 km (10,000 ft) a.s.l. 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.

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.

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