All times are local unless otherwise stated.

Avachinsky (Russia) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Avachinsky Eastern Kamchatka Volcanic Arc	During 19-26 October several gas-and-steam plumes rose above Avachinsky's crater, with the highest plume reaching 1 km and extending 20 km to the SE on 20 October. Seismic activity continued above background levels; ten earthquakes occurred with magnitudes of 1.3-2.1. The volcano remained at Concern Color Code Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Karangetang (Indonesia) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Karangetang Sangihe Volcanic Arc	During 15-21 October volcanic activity at Karangetang continued to decrease, as it did the previous week, and the Alert Level was reduced from 3 to 2 (on a scale of 1-4). The number of volcanic earthquakes decreased compared to the previous week and no avalanche, tremor, or explosion earthquakes were recorded. Multiphase earthquakes, associated with lava dome growth, were detected. White plumes rose 400 m above main crater, and 50-100 m above Crater II. A "red reflection" was observed reaching up to 25 m above the crater. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Kīlauea (United States) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	Surface lava flows were visible above and on Kīlauea's Pūlama pali scarp and on the coastal flat. Lava continued to flow through lava tubes, entering the sea at the E Kupapaʻu and Kamoamoa entries. By 28 October the rapidly growing lava bench at Kamoamoa was 120 m seaward of the old sea cliff in comparison to 80-100 m the previous week. Generally, volcanic tremor remained at low-to-moderate levels at both Kīlauea's summit and Puʻu ʻŌʻō. On 24 October short bursts of relatively high amplitude tremor returned to Puʻu ʻŌʻō after being nearly absent for 2-3 days. During 23-24 October tiltmeters at the summit and Puʻu ʻŌʻō recorded slow deflation. No significant deformation was recorded during the rest of the week. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Merapi (Indonesia) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Merapi Sunda Volcanic Arc	During 15-21 October, VSI personnel observed 103 incandescent lava avalanches traveling SW predominately to the upstream portion of the Sat River, and to a lesser extent to the Lamat and Senow rivers. The maximum run-out distance was 2.75 km. Seismic activity was dominated by avalanche earthquakes similar in magnitude and frequency to earthquakes the previous week. Merapi remained at Alert Level 2 (on a scale of 1-4). Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Popocatépetl (Mexico) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	On 25 October at approximately 0600 a steam column was observed rising 1-2.5 km above Popocatépetl's crater, drifting to the NW. Ground observations confirmed that the column did not include ash. The MWO reported to the Washington VAAC that another eruption column the same day at 1040 rose to ~6.7 km. A narrow plume of ash from the eruption was visible extending to the N on satellite imagery. The volcano remained at Alert Level Yellow Phase II. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Sheveluch (Russia) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	During 19-26 October, a lava dome continued to grow in Shiveluch's active crater. An explosion during 22-23 October produced a steam-and-gas plume visible from the town of Klyuchi, 46 km from the volcano, rising 4-4.2 km a.s.l. Thermal anomalies in the active dome area were visible on satellite imagery. Spasmodic volcanic tremor and weak, shallow seismic signals (possible collapses and avalanches) were registered. The number of weak shallow seismic events and the intensity of volcanic tremor slowly increased. Shiveluch remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufrière Hills (United Kingdom) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	During 19-26 October there was a general reduction in volcanic activity at Soufrière Hills in comparison with the previous week, while seismicity remained at a similar level. The active lava dome continued to grow at a moderate rate, producing rockfalls and small pyroclastic flows in the upper reaches of the Tar River Valley. Cycles of mostly hybrid earthquakes, with a coincident increase in rockfalls, recommenced after weakening for about a week. Mudflows occurred in the Belham Valley during several days with periods of torrential rainfall. Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
Tungurahua (Ecuador) | 24 October-30 October 2001 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	During the week, relatively low volcanic activity continued at Tungurahua. Several steam-and-ash emissions occurred. The night of 23 October ash emissions were observed rising 1 km above the volcano's summit. During 23 to 25 October there was a small increase in the number of long-period earthquakes and steam-and-ash emissions. On 26 October a hot spot was visible at Tungurahua's summit on thermal satellite imagery. Source: 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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