All times are local unless otherwise stated.

Anatahan (United States) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Anatahan Mariana Volcanic Arc	During 14-16 June, the level of seismicity was significantly lower at Anatahan than during the previous week. After the 16th, seismicity returned to the higher levels seen before the 14th and remained there through 28 June. On the 28th a tropical storm knocked out the last seismic station on Anatahan, prohibiting further monitoring until it is repaired. Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Bezymianny (Russia) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	An eruption at Bezymianny produced an ash cloud that during 18-19 June extended more than 1,000 km E and SE from the volcano and possible ash deposits extended 190 km SE from the lava dome. Seismicity at Bezymianny did not exceed background levels during 20-23 June. The Concern Color Code at Bezymianny was reduced from Orange to Yellow around 25 June. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Colima (Mexico) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Colima Trans-Mexican Volcanic Arc	On 21 June low-level activity continued at Colima, with an average of three ash explosions occurring daily. The resultant ash plumes did not exceed heights of 2 km above the crater. Source: Centro Universitario de Estudios Vulcanológicos (CUEV) - Universidad de Colima
Fuego (Guatemala) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Fuego Central America Volcanic Arc	On 28 and 29 June, small explosions at Fuego produced plumes to ~0.8 km above the volcano that predominately drifted SW. Incandescence was visible in the crater at night. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Karymsky (Russia) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Seismicity remained above background levels at Karymsky during 18-25 June, with 300-350 shallow earthquakes occurring per day. Based on interpretations of seismic data, possible ash-and-gas explosions rose daily to 2.5-4.5 km a.s.l. Pilots saw an ash plume on 17 June rise to ~2.5 km a.s.l. On 18 June, an ash plume extended ~40 km E. Karymsky remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 24-28 June, lava continued to flow down the Pulama Pali scarp, Paliuli, and into the sea. In addition, vents at Puʻu ʻŌʻō cone were incandescent. A few small earthquakes continued beneath Kīlauea's summit, but no tremor was recorded. Tremor at Puʻu ʻŌʻō was at moderate-to-high levels. During the report period, small periods of inflation and deflation occurred. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Nyiragongo (DR Congo) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Nyiragongo Albertine Rift Volcanic Province	Satellite imagery showed that ash emissions from Nyiragongo that began on 4 June appeared to have ceased by 22 June. Source: Toulouse Volcanic Ash Advisory Centre (VAAC)
Santa María (Guatemala) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Santa María Central America Volcanic Arc	Weak-to-moderate explosions occurred at Santa María's Santiaguito lava-dome complex during 25-29 June. Plumes rose to ~1 km above the crater and there were sporadic, weak avalanches of volcanic material. On 28 June at 0622, a partial lava-dome collapse sent material down the W side of Caliente cone for ~40 minutes. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	Seismicity was above background levels at Shiveluch during 18-25 June. Shallow earthquakes up to M 1.75 were recorded, along with nearly continuous spasmodic tremor. Gas plumes rose to ~4 km a.s.l. On 19 June, a likely ash cloud was seen 10-20 km S of the volcano. Shiveluch remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Shishaldin (United States) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Shishaldin Aleutian Ridge Volcanic Arc	Seismic unrest continued at Shishaldin during 18-25 June, with weak tremor and occasional discrete low-frequency earthquakes occurring. A pilot reported seeing steam rise to low levels above Shishaldin's cone. Around that time, a possible weak thermal anomaly was visible on satellite imagery. Shishaldin remained at Concern Color Code Yellow. Sources: Anchorage Volcanic Ash Advisory Center (VAAC), US Geological Survey Alaska Volcano Observatory (AVO)
Soufrière Hills (United Kingdom) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	Activity at Soufrière Hills remained at low levels during 18-25 June. Most seismic activity occurred during 18-20 June, with extremely low seismicity during the remainder of the report period. The upper portions of the lava-dome complex within the crater were visible for the first time since 7 May 2004, revealing that parts of the dome had been lost. This explained the rockfall signals recorded during the previous weeks. Technical problems prevented measurements of the sulfur-dioxide flux. Source: Montserrat Volcano Observatory (MVO)
Tungurahua (Ecuador) | 23 June-29 June 2004 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	At Tungurahua during 23-28 June, there were several emissions of steam, gas, and moderate amounts of ash. About 5-10 small-to-moderate explosions occurred daily. Plumes from eruptions rose to ~1.5 km above the crater. Seismicity was characterized by long-period earthquakes. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

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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