All times are local unless otherwise stated.

Chikurachki (Russia) | 9 March-15 March 2005 | New Eruptive Activity Cite this Report
Chikurachki Kuril Volcanic Arc	Increased volcanic activity at Chikurachki on 12 March led KVERT to raise the Concern Color Code from Green to Yellow. Prior to the increase in Concern Color Code, on 1 March observers in Severo-Kurilsk (~70 km NE of Chikurachki) saw a gas-and-steam plume rise ~400 m above the volcano. On 12 March MODIS satellite imagery showed an ash plume extending NNW from the volcano. Chikurachki last erupted during April to June 2003. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Colima (Mexico) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Colima Trans-Mexican Volcanic Arc	An eruption at Colima on 10 March at 0810 produced pyroclastic flows that traveled up to 3 km down the volcano's flanks in all directions. In addition, an E-drifting ash cloud was generated that rose to a height of ~2 km above the crater. Ash fell in and near the cities of Guzmán and Jalisco. On 13 March at 1528 a large explosion produced a pyroclastic flow down several ravines: El Muerto, Montegrande, San Antonio, and the eastern part of El Cordobán. According to the Mexico City MWO, an ash plume rose to ~5 km above the crater. Ash and rock fragments fell in the towns of Mazos and Jalisco, ~12.5 km NE of the volcano. Sources: Centro Universitario de Estudios Vulcanológicos (CUEV) - Universidad de Colima, Washington Volcanic Ash Advisory Center (VAAC)
Kīlauea (United States) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	On 15 March only small areas of surface lava flows at Kīlauea were visible on the Pūlama pali fault scarp, and the amount of lava in the three branches of the PKK lava flow continued to decrease. Lava continued to enter the ocean at the Kaʻiliʻili and East Laeʻapuki ocean entries. Only a few small earthquakes occurred below the volcano's S flank. The level of volcanic tremor was low at the summit and moderate at Puʻu ʻŌʻō. Small amounts of deflation occurred at Kīlauea's summit and Puʻu ʻŌʻō. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Manam (Papua New Guinea) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Manam Bismarck Volcanic Arc	On 15 March, a thin plume from Manam was visible on satellite imagery. The Alert Level at Manam remained at 2. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Popocatépetl (Mexico) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Popocatépetl Trans-Mexican Volcanic Arc	During 9-15 March, Popocatépetl occasionally emitted steam, gas, and small amounts of ash. An ash emission on 9 March at 1304 produced a plume that rose to ~500 m above the summit crater and drifted E. Ash fell in the towns of Huejotzingo (~30 km NE of the volcano) and Puebla (~45 km E). The Alert Level at Popocatépetl remained at Yellow Phase I. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Rabaul (Papua New Guinea) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Rabaul Bismarck Volcanic Arc	Low-level eruptions continued at Rabaul caldera's active Tavurvur cone during 9-15 March. According to the Darwin VAAC, ash may affect Tokua airport, depending on the prevailing wind direction. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Soufrière Hills (United Kingdom) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	Seismicity remained at low levels at Soufrière Hills during 4-11 March. The sulfur-dioxide flux remained around the same level as the previous week, with an average of 695 metric tons recorded daily. During the week, a strong sulfurous smell was noticed across the northern part of Montserrat. MVO attributed this to a deviation from the normal prevailing wind direction. Source: Montserrat Volcano Observatory (MVO)
St. Helens (United States) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
St. Helens High Cascades Volcanic Arc	A small but significant explosion that occurred at St Helens on 8 March at 1725 produced a fine dusting of ash in Ellensberg, Yakima, and Toppenish, Washington during 1900-2100. By 0200 on 9 March, the leading edge of the faint, diffuse plume had reached western Montana. Scientists found that St. Helens' lava dome was intact after the explosion and that ballistics up to ~1 m in diameter were hurled as far as the northern flank of the old lava dome. No ballistics were found along, or beyond the crater rim. The source of the explosion was from the NNW side of the new lava dome and was very near the source of the 1 October 2004 and 16 January 2005 explosions. After the 8 March explosion, St. Helens only emitted steam, and seismicity returned to a level similar to that during the several hours prior to the explosion. Gas emissions were very low, essentially unchanged from those measured in late February. During 9-15 March, St. Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Suwanosejima (Japan) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that an explosion at Suwanose-jima on 9 March produced an ash plume to a height of ~1.8 km a.s.l. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Tungurahua (Ecuador) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	During 9-14 March, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy gas-and-steam plumes were emitted, and long-period earthquakes and episodes of tremor were recorded. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ulawun (Papua New Guinea) | 9 March-15 March 2005 | Continuing Eruptive Activity Cite this Report
Ulawun Bismarck Volcanic Arc	RVO advised the Darwin VAAC that volcanic activity was relatively low at Ulawun on 8 March, but seismicity was increasing. On 15 March a faint plume was visible on satellite imagery Source: Darwin Volcanic Ash Advisory Centre (VAAC)

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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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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