All times are local unless otherwise stated.

Anatahan (United States) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Anatahan Mariana Volcanic Arc	During 26 May to 1 June, elevated seismicity at Anatahan consisted of discrete explosion signals. Every few minutes explosions threw volcanic material hundreds of meters out of the crater, and steam and ash likely rose a few hundred meters. Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Bagana (Papua New Guinea) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Bagana Bougainville Volcanic Arc	An ash plume from Bagana was visible on satellite imagery during 26-27 May. The plume reached a height of ~3 km a.s.l. and extended ~130 km NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Colima (Mexico) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Colima Trans-Mexican Volcanic Arc	During late May low-level activity continued at Colima, with an average of two ash-containing explosions per day. The eruption clouds did not exceed 2 km above the volcano's crater and predominately drifted W. Source: Centro Universitario de Estudios Vulcanológicos (CUEV) - Universidad de Colima
Dukono (Indonesia) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	During 26-31 May, Dukono occasionally emitted plumes that were visible on satellite imagery at a height of ~3 km a.s.l. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Fuego (Guatemala) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Fuego Central America Volcanic Arc	During 31 May to 1 June moderate volcanic and seismic activity continued at Fuego, with several explosions producing ash plumes. The highest rising plume reached ~1.5 km above the volcano on 31 May. This explosion also produced avalanches of volcanic material down the ravines of Taniluyá and Santa Teresa. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kikai (Japan) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Kikai Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that Kikai erupted on 1 June at 1330. The resultant ash cloud rose to an unknown height and drifted W. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Kīlauea (United States) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	Kīlauea's Banana lava flow reached the sea on 30 May near the eastern end of the Wilipeʻa lava delta. This was the first time lava had reached the sea since July 2003. The interaction of the water and lava was not explosive. During 26-31 May, low-frequency earthquakes and no noticeable tremor occurred at Kīlauea's summit. Tremor at Puʻu ʻŌʻō was at its typical moderate level. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Nyamulagira (DR Congo) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Nyamulagira Albertine Rift Volcanic Province	The Toulouse VAAC reported that during 26 May to 1 June there were weak but steady emissions from Nyamuragira and neighboring Nyiragongo (~13 km SE from Nyamuragira). The Goma volcano observatory confirmed that ash fell within a radius of 60 km of both volcanoes. Source: Toulouse Volcanic Ash Advisory Centre (VAAC)
Nyiragongo (DR Congo) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Nyiragongo Albertine Rift Volcanic Province	The Toulouse VAAC reported that during 26 May to 1 June there were weak but steady emissions from Nyiragongo and neighboring Nyamuragira (~13 km NW from Nyiragongo). The Goma volcano observatory confirmed that ash fell within a radius of 60 km of both volcanoes. Source: Toulouse Volcanic Ash Advisory Centre (VAAC)
Popocatépetl (Mexico) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	On 26 May at 0643 a small emission from Popocatépetl of steam, gas, and small amounts of ash produced a plume that reached a height of ~1.5 km above the volcano's crater. Ash fell in Tetela del Volcán, Morelos. Also, an M 2.4 volcano-tectonic microearthquake occurred 2 km E of the crater. Aerial photography taken on 14 April showed continued subsidence of the inner crater. No external lava dome at the bottom of the crater was distinguished. The Alert Level at Popocatépetl remained at Yellow Phase 1, therefore access was restricted in a 12-km-radius around the volcano. Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Agence France-Presse (AFP)
Santa María (Guatemala) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Santa María Central America Volcanic Arc	During 31 May to 1 June, weak-to-moderate explosions at Santa María's Santiaguito lava-dome complex produced gas-and-ash plumes that rose ~1.5 km above the crater. Small partial collapses at the edge of the Caliente lava dome produced avalanches of incandescent volcanic material down the SW flank. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	On 21 May, observations of Shiveluch from a helicopter revealed pyroclastic flows and partial destruction of the lava dome. Ash deposits were concentrated in the central sector of the southern volcanic slope. During 21-28 May seismicity was above background levels, with a large number of shallow earthquakes occurring. Gas-and-steam plumes rose to ~4 km a.s.l. Shiveluch remained at Concern Color Code Orange. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Shishaldin (United States) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Shishaldin Aleutian Ridge Volcanic Arc	Seismic unrest continued at Shishaldin during 21-28 May. It was characterized by weak seismic tremor and occasional discrete low-frequency earthquakes. Meteorological clouds obscured views of the volcano. Shishaldin remained at Concern Color Code Yellow. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Soufrière Hills (United Kingdom) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	Volcanic and seismic activity at Soufrière Hills remained at low levels during 21-28 May. Seismicity was dominated by signals from mudflows associated with the heavy rain of 21 May. The mudflows occurred during about 1420-1636 and were followed by a swarm of 44 small earthquakes. The sulfur-dioxide flux varied, reaching values between about 225 and 920 tons per day. Source: Montserrat Volcano Observatory (MVO)
Tungurahua (Ecuador) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	During 26-31 May, small-to-moderate emissions of steam, gas, and ash occurred at Tungurahua and seismicity was at moderate levels. Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)
Veniaminof (United States) | 26 May-1 June 2004 | Continuing Eruptive Activity Cite this Report
Veniaminof Aleutian Ridge Volcanic Arc	During 21-28 May, the level of volcanic activity at Veniaminof was generally lower than during the previous week. Sequences of tremor accompanying ash bursts continued. On video, weak steaming and low ash bursts were seen emanating from the intracaldera cone. Most of the ash bursts did not rise above the active cone (2,156 m). Satellite imagery on 26 May showed ash deposits on the N and SE portions of the caldera. Veniaminof remained at Concern Color Code Yellow. Source: US Geological Survey Alaska Volcano Observatory (AVO)

Since the Weekly Volcanic Activity Report began in November 2000, there have been 22,882 individual reports over 1,336 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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