All times are local unless otherwise stated.

Bulusan (Philippines) | 1 August-7 August 2007 | New Eruptive Activity Cite this Report
Bulusan Eastern Philippine Volcanic Arc	An explosion from Bulusan on 31 July produced an ash plume that rose to an altitude of 6.6 km (21,700 ft) a.s.l. The plume drifted WSW and WNW, causing light ashfall. According to a news article, white steam plumes rose from active craters and fissures on 2 August. The Alert Level remained at 1 (out of 5). Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Agence France-Presse (AFP)
Cleveland (United States) | 1 August-7 August 2007 | New Eruptive Activity Cite this Report
Cleveland Aleutian Ridge Volcanic Arc	A thermal anomaly in the crater of Cleveland was intermittently visible on satellite imagery during 2-6 August, though bad weather often limited observations. Photographs from 27 July and a pilot report from 2 August indicated fresh volcanic ejecta on the slopes and summit. The E portion of Chuginadak Island was dusted with ash on 3 August. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Fuego (Guatemala) | 1 August-7 August 2007 | New Eruptive Activity Cite this Report
Fuego Central America Volcanic Arc	INSIVUMEH reported that explosions from Fuego expelled incandescent material 50-75 m above the crater on 1 August. Incandescent avalanches traveled 500-700 m down the S and W flanks. Rumbling noises and shock waves were noted at nearby locations. On 2 August, a moderate eruption produced pyroclastic flows that traveled approximately 2 km SSW down the Ceniza River valley. A resultant ash plume rose to an altitude of 5.3 km (17,400 ft) a.s.l. and produced ashfall in areas to the S, SW, and W for several minutes. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kīlauea (United States) | 1 August-7 August 2007 | New Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	HVO reported that two of the four fissures from Kīlauea's 21 July fissure eruption remained active during 1-7 August. The four fissures, A, B, C, and D, consecutively segment an approximately 2 km-long line that trends NE; fissure A is to the SE and fissure D is to the NE. During the reporting period, fissure C minimally fed a perched lava pond. Fissure D fed a NE-advancing 'a'a lava flow that was an estimated 3.5 km long on 1 August. The 'a'a flow entered the forest on 6 August as evident by smoke near the flow front. Fuming was seen on Puʻu ʻŌʻō's crater web camera images on 4, 5, and 7 August. A few small earthquakes were located beneath Halemaʻumaʻu crater, the S flank, and an area offshore between Kīlauea and Lo'ihi during 1-7 August. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Papandayan (Indonesia) | 1 August-7 August 2007 | New Eruptive Activity Cite this Report
Papandayan Sunda Volcanic Arc	On 2 August, CVGHM raised the Alert Level at Papandayan from 1 to 2 (on a scale of 1-4) due to increased activity at the volcano. During 15 July-1 August, the number of volcanic earthquakes increased. By 31 July, the temperatures of fumaroles had increased 10 degrees C above normal levels in Mas crater. Temperatures were 3.5 degrees C above normal levels in Balagadama crater since 26 June. On 1 August, a diffuse white plume rose to an altitude of 2.7 km (8,900 ft) a.s.l. Associated with the increase in Alert Level, villagers and tourists were not permitted within a 1 km radius of the active craters. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Aira (Japan) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported an explosion from Sakura-jima on 4 August. Ash was not detected on satellite imagery. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Karymsky (Russia) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Seismic activity at Karymsky was above background levels during 27 July-3 August, with 150-600 shallow earthquakes occurring daily. Based on seismic interpretation, ash plumes may have risen to an altitude of 3 km (9,800 ft) a.s.l. Observations of satellite imagery revealed that a thermal anomaly was present in the crater on 31 July and 2 August and gas-and-steam plumes drifted SW on 2 August. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Popocatépetl (Mexico) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	According to the Washington VAAC, CENAPRED reported that on 28 July an eruption plume from Popocatépetl with minor ash content was visible on a web camera. The plume rose to an altitude of 7 km (23,000 ft) a.s.l. and drifted WSW. A pilot reported an ash plume on 3 August. Ash was not identified on satellite imagery on either day. Source: Washington Volcanic Ash Advisory Center (VAAC)
Rabaul (Papua New Guinea) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Rabaul Bismarck Volcanic Arc	RVO reported that during 22 July-1 August, white and blue vapor plumes from Rabaul caldera's Tavurvur cone rose to an approximate altitude of 0.9 km (3,000 ft) a.s.l. and drifted NNW. Roaring noises were occasionally heard and incandescence was intermittently visible at the crater rim. On 30 July, a white plume with little ash content rose to an altitude of 2.7 km (8,900 ft) a.s.l. and drifted SW. During 1-7 August, ash plumes rose to altitudes of 0.9-1.7 km (3,000-5,600 ft) a.s.l. and drifted N, NW, and W. Slight ashfall was reported at Rabaul town and surrounding areas. Source: Rabaul Volcano Observatory (RVO)
Sangay (Ecuador) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Sangay Northern Andean Volcanic Arc	Based on pilot observations, the Washington VAAC reported that an ash plume from Sangay rose to an altitude of 5.5 km (18,000 ft) a.s.l. and drifted W on 2 August. Ash was not detected on satellite imagery. Source: Washington Volcanic Ash Advisory Center (VAAC)
Semeru (Indonesia) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Semeru Sunda Volcanic Arc	Based on a pilot observation, the Darwin VAAC reported that an ash plume, possibly from Semeru, rose to an altitude of 6.1 km (20,000 ft) a.s.l. on 6 August. Ash was not detected on satellite imagery. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sheveluch (Russia) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Shiveluch was slightly above background levels during 27 July-3 August. Observations of satellite imagery revealed that a thermal anomaly was present in the crater. Based on seismic interpretation, ash plumes and avalanches occurred during the reporting period. Gas-and-steam plumes were visible drifting S on 31 July; clouds inhibited visual observations on other days. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufrière Hills (United Kingdom) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	MVO reported that during 27 July-3 August, the lava dome at Soufrière Hills changed very little, based on visual observations. Seismic activity was very low and low-level rockfall activity affected all sides of the dome. On 30 July, three pyroclastic flows traveled about 1.5 km down the N side of the Tar River Valley. The Alert Level remained elevated at 4 (on a scale of 0-5). Source: Montserrat Volcano Observatory (MVO)
St. Helens (United States) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
St. Helens High Cascades Volcanic Arc	Data from deformation-monitoring instruments indicated that during 1-7 August lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. In some instances, clouds inhibited visual observations. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Tungurahua (Ecuador) | 1 August-7 August 2007 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	IG reported that on 1 August, ash-and-gas plumes from Tungurahua rose to altitudes of 5.5 km (18,000 ft) a.s.l. and drifted NW. Ashfall was reported from areas downwind. Noises indicating rolling blocks were heard. On 2 August, steam emissions and roaring noises were reported. On 5 August, roaring noises were reported and a steam-and-gas plume rose to an altitude of 5.1 km (16,700 ft) a.s.l. and drifted W. On 6 August, explosions were accompanied by roaring noises that were reported from the NW and SW sectors. A steam plume rose to an altitude of 5.2 km (17,100 ft) a.s.l. and drifted W on 7 August. Clouds occasionally inhibited visual observations. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Since the Weekly Volcanic Activity Report began in November 2000, there have been 22,839 individual reports over 1,334 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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