All times are local unless otherwise stated.

Cleveland (United States) | 6 July-12 July 2005 | New Eruptive Activity Cite this Report
Cleveland Aleutian Ridge Volcanic Arc	Satellite imagery of Cleveland taken during 1-8 July revealed increased activity at the volcano, so AVO assigned a Concern Color Code of Yellow on 7 July. The images showed increased heat flow, thin ash deposits, and possible debris flows extending ~1 km down the volcano's flanks from the summit crater. AVO reported that based on historical eruptions at Cleveland, it is possible that explosive, ash-producing events could occur at any time without warning (due to a lack of seismic monitoring). Source: US Geological Survey Alaska Volcano Observatory (AVO)
Merapi (Indonesia) | 6 July-12 July 2005 | New Eruptive Activity Cite this Report
Merapi Sunda Volcanic Arc	An increase in the number of volcanic earthquakes at Merapi during 7-11 July led DVGHM to increase the Alert Level at the volcano to 2 (on a scale of 1-4) on 9 July. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Sheveluch (Russia) | 6 July-12 July 2005 | New Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	On 6 July ash-and-gas plumes from Shiveluch rose to ~7 km (~23,000 ft) a.s.l. and drifted NW. On 7 July an 11-minute-long seismic event occurred and ash-and-gas plumes may have reached a height of 10 km (32,800 ft) a.s.l. Around 8 July, KVERT raised the Concern Color Code at Shiveluch from Orange to Red, the highest level. On 8 July, video footage showed weak gas-and-steam plumes rising to ~5 km (16,400 ft ) a.s.l. On 9 July, the Concern Color Code was reduced to Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Aira (Japan) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that explosions occurred at Sakura-jima on 8 and 10 July. The heights of the resultant plumes were not reported. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Anatahan (United States) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Anatahan Mariana Volcanic Arc	During 6-11 July, eruptive activity continued at Anatahan, with steam-and-ash plumes rising to a maximum height of 6.1 km (20,000 ft) a.s.l. On 6 July beginning at 1730 the amount of tremor at the volcano increased and an eruption produced an ash plume to ~12.2 km (~40,000 ft) a.s.l. During 8-11 July, a thin layer of vog (volcanic fog) extended over much of the Philippine Sea. Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Colima (Mexico) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Colima Trans-Mexican Volcanic Arc	Several explosions occurred at Colima during 6-9 July and small landslides traveled down the volcano's flanks during 8-9 July. Due to the threat of lahars forming on the volcano's flanks, Universidad de Colima advised avoiding the ravines of La Lumbre, San Antonio, Monte Grande (in Colima state), and La Arena (in Jalisco state). Source: Centro Universitario de Estudios Vulcanológicos (CUEV) - Universidad de Colima
Fuego (Guatemala) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Fuego Central America Volcanic Arc	During 6-11 July, several explosions at Fuego produced low-level plumes. Small avalanches of volcanic material traveled down the S and W sides of the central crater, and from the front of a lava flow. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Galeras (Colombia) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Galeras Northern Andean Volcanic Arc	During 4-11 July, seismicity remained at low levels at Galeras. An M 2.5 volcano-tectonic earthquake on 4 July was felt in sections of some towns near the volcano. During the report period, small amounts of deformation were recorded and low rates of gas discharge were noted. Source: Servicio Geológico Colombiano (SGC)
Karymsky (Russia) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Seismicity was above background levels at Karymsky during 1-8 July. Based on interpretations of seismic data during 4-7 July, ash-and-gas plumes may have risen to ~3 km above the crater (14,900 ft a.s.l.). Karymsky remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 6-11 July, lava from Kīlauea continued to enter the sea at the East Kamoamoa and East Laeʻapuki entries. East Laeʻapuki was much larger, with several entry points. East Kamoamoa barely emitted a glow from the incandescent lava. Surface lava was visible along the PKK lava flow. Background volcanic tremor remained above normal levels at Kīlauea's summit and at moderate levels at Puʻu ʻŌʻō. Slight inflation and deflation occurred at the volcano. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Pacaya (Guatemala) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Pacaya Central America Volcanic Arc	During 6-11 July, lava flows traveled 200-300 m down Pacaya's SW flank. Small plumes emitted from the volcano's central crater rose to low altitudes. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Reventador (Ecuador) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Reventador Northern Andean Volcanic Arc	As of 6 July, harmonic tremor, occasional explosions, and long-period and volcano-tectonic earthquakes continued at Reventador. Strong Strombolian fountaining was observed during the evening and one of the lobes of a lava flow (Lava number 5) was advancing down the caldera wall following the Río Marker. The flow abruptly slowed to ~20 m/day in comparison to flow-front velocities of ~70 m/day during 19-23 June, and ~50 m/day during 23-30 June. Lava number 5 was ~1.2 km from a steep incline, where it could begin to rapidly descend to the alluvial fan where the highway and petroleum pipeline are located. Based on information from IG, the Washington VAAC reported that an ash plume extended N of the volcano's summit on 11 July. No ash was visible on satellite imagery. Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)
Santa María (Guatemala) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Santa María Central America Volcanic Arc	During 6-11 July, weak-to-moderate explosions continued at Santa María's Santiaguito lava-dome complex, with plumes rising to ~1 km above the volcano (15,700 ft a.s.l.). Avalanches of volcanic material were produced at the front of an active lava flow, and from the SW edge of Caliente Dome. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Soufrière Hills (United Kingdom) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	During 1-8 July, seismic and volcanic activity at Soufrière Hills remained at elevated levels. The seismic network recorded 15 hybrid earthquakes, 11 long-period earthquakes, 9 volcano-tectonic earthquakes, and 11 rockfalls. Periodic ash venting continued and an explosion occurred on 3 July at 0130, which was similar to an explosion on 28 June. The reversal of deformation to an inflationary trend that began in mid-July continued during the report period. The daily recorded sulfur-dioxide flux varied from 241 metric tons per day (t/d) on 4 July to 1700 t/d on 1 July, with an average of 767 t/d for the week. This was above the long-term average for the eruption of 500 t/d. Source: Montserrat Volcano Observatory (MVO)
St. Helens (United States) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
St. Helens High Cascades Volcanic Arc	Growth of the new lava dome inside the crater of Mount St. Helens continued during 6-12 July, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. CVO reported on 12 July that rates of seismicity and ground deformation at Mount St. Helens had declined during the previous 2 weeks to some of the lowest levels since the eruption began in September 2004. They reported that a similar lull in activity occurred in December 2004, so it does not mean that the eruption is necessarily ending. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Suwanosejima (Japan) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that an explosion occurred at Suwanose-jima on 6 July at 1400. The height of the resultant ash cloud was not reported. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Talang (Indonesia) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Talang Sunda Volcanic Arc	Small phreatic eruptions occurred at Talang on 2 and 3 July. The eruptions occurred at the main crater, and a crater on the volcano's S slope. Ash columns reached 300-500 m above the volcano (10,500-11,100 ft a.s.l.). Gabuo Atas, Gabuo Bawah, and Kapundan Panjang craters on the volcano's N slope emitted steam to low altitudes. Talang remained at Alert Level 2 (on a scale of 1-4). Visitors were not permitted to enter within a 1 km radius of the active craters. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Tungurahua (Ecuador) | 6 July-12 July 2005 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	During 6-11 July, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy plumes were emitted that were composed of gas, steam, and occasionally small amounts of ash. Seismicity remained at low levels. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

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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