All times are local unless otherwise stated.

Dieng Volcanic Complex (Indonesia) | 30 July-5 August 2003 | New Eruptive Activity Cite this Report
Dieng Volcanic Complex Sunda Volcanic Arc	Mud flowed from Dieng's Sileri crater during the night of 20 July, traveling as far as 25 m S of the crater rim. The temperature of the crater on 21 July was 74° C, which had not increased much since last measured. On 22 July the Alert Level at Dieng was raised to 2 (on a scale of 1-4). On 24 July at 0730 mud flowed as far as 50 m from the crater towards the N and E. Mud bubbled up to 1 m high in the center of the crater. No heightened seismicity was recorded during either mud-flow event. According to news reports, the crater was closed to tourists. Sources: The Jakarta Post, Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Gamalama (Indonesia) | 30 July-5 August 2003 | New Eruptive Activity Cite this Report
Gamalama Halmahera Volcanic Arc	VSI raised the Alert Level at Gamalama to 3 (on a scale of 1-4) after an explosion on 31 July around 1430 produced an ash column that rose 0.5-1 km above the volcano and drifted E. Another explosion occurred at 1439 that rose to 1-1.5 km above the volcano, and deposited ash in the town of Ternate ~30 km N of the volcano. The next large explosion occurred at 1625 and ejected incandescent material, produced an ash column that reached 1-2 km above the summit and drifted E, and was accompanied by a pyroclastic flow that traveled ~1 km into the Togorara Valley. VSI raised the Alert Level to 4, the highest level, and some residents near the volcano were evacuated. After an explosion at 1704 produced an ash cloud to 1-1.5 km above the volcano, low-level ash and gas emissions occurred at Gamalama through 1 August. Sources: Associated Press, Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Bezymianny (Russia) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	During 27-30 July, no seismicity was recorded at Bezymianny and visual observations were not possible due to meteorological clouds obscuring the volcano. A thermal anomaly was visible on satellite imagery on 28, 29, and 31 July, and 1 August. The Concern Color Code remained at Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Colima (Mexico) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Colima Trans-Mexican Volcanic Arc	Based on information from the Control Tower at Colima airport, the Washington VAAC reported that an emission from Colima on 3 August at 0739 produced a plume to ~7.6 km a.s.l. On 4 August at 0845 a small ash emission occurred that was visible on satellite imagery. The Mexico City MWO reported that the cloud rose to ~ 6 km a.s.l. and drifted W. Source: Washington Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	During 9-14 July, ash explosions at Dukono produced ash plumes to heights of 800-900 m above the volcano. Ash fell around the towns of Mamuya and Galela. During 15-23 July ash plumes rose to low levels, with a plume reaching ~1 km above the volcano on 22 July. According to the Darwin VAAC, ash was visible on satellite imagery on 31 July and 2 and 3 August, with the highest cloud reaching ~2 km above the volcano. Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
Etna (Italy) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Etna Sicily Volcanic Province	During the end of July, heightened seismicity occurred in the eastern area of Etna. Also, vigorous degassing continued at Northeast crater, and less intense degassing occurred at Bocca Nuova crater. Four small earthquakes with magnitudes up to 2.6 occurred on 30 July between the villages of Milo and Zafferana on the volcano's E flank. Sources: Etna Volcan Sicilien (Charles Rivière), Italy's Volcanoes
Kīlauea (United States) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 30 July- 5 August at Kīlauea, surface lava flows were visible on the coastal flat and upslope on the Pūlama pali and beginning around 3 August at the Holei pali. Surface lava flowed to within 1.1 km of the sea. Generally, seismicity at Kīlauea's summit continued at moderate levels, with 1-2 small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera. There were some larger events at depths of a few kilometers. Small inflation and deflation occurred during the report week. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	Seismicity was above background levels at Kliuchevskoi during 24 July to 1 August. During 24-28 July, 14-17 earthquakes with magnitudes less than 2.1 occurred each day. The number of earthquakes decreased to 9 on 29 July, and 7 on 30 July. Gas-and-steam plumes rose to a maximum height of ~700 m above the crater. Kliuchevskoi remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Popocatépetl (Mexico) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	During 30 July-5 August, moderate emissions of mainly gas, steam, and sometimes ash occurred at Popocatépetl. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Semeru (Indonesia) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Semeru Sunda Volcanic Arc	Based on information from an aircraft report, the Darwin VAAC reported that an ash plume emitted from Semeru rose to ~4.5 km a.s.l. on 31 July at 1120. No ash was visible on satellite imagery. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Soputan (Indonesia) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Soputan Sangihe Volcanic Arc	Activity decreased at Soputan after an eruption occurred on 18 July. During 21-25 July, incandescent lava on the volcano's W slope gradually cooled and on 22 July volcanic tremor stopped. Ash explosions sporadically occurred, but their density and maximum height decreased. Small-amplitude tremor was continuously recorded. As of 25 July the Alert Level at Soputan was at 2 (on a scale of 1-4). Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Soufrière Hills (United Kingdom) | 30 July-5 August 2003 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	As of 1 August, ash emissions were continuing from Soufrière Hills. Low-level ash clouds were visible on satellite imagery. Source: Washington Volcanic Ash Advisory Center (VAAC)

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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