All times are local unless otherwise stated.

Concepción (Nicaragua) | 3 March-9 March 2010 | New Eruptive Activity Cite this Report
Concepción Central America Volcanic Arc	Based on information from INETER and analyses of satellite imagery, the Washington VAAC reported that on 8 March an ash plume from Concepción rose to an estimated altitude of 2.1 km (7,000 ft) a.s.l. The plume was last seen in satellite imagery later that day 227 km W. Source: Washington Volcanic Ash Advisory Center (VAAC)
Llaima (Chile) | 3 March-9 March 2010 | New Eruptive Activity Cite this Report
Llaima Southern Andean Volcanic Arc	SERNAGEOMIN reported that on 4 March seismicity from Llaima increased. During an overflight that same day, scientists observed emissions of gas and steam from the main crater. Images taken that day were compared to those taken on 21 February and showed no significant changes in morphology. The rate of sulfur dioxide emissions had increased, however. Scientists also noted deposits from a large rockfall along with fracturing of the glacier, especially on the upper N and NW flanks. Those observations in addition to the increased seismicity prompted SERNAGEOMIN to raise the Alert Level to Yellow, Level 4. Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Aira (Japan) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	During 3-9 March, the Tokyo VAAC reported multiple explosions from Sakura-jima based on information from JMA. During 3, 5-6, and 8-9 March, plumes rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted NE, E, and SE. Pilots reported on 8 and 9 March that ash plumes rose as high as 3 km (10,000 ft) a.s.l. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Ambrym (Vanuatu) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Ambrym Vanuatu Volcanic Arc	Based on pilot observations and analyses of satellite imagery, the Wellington VAAC reported that ash plumes from Ambrym rose to an altitude of 2.4 km (8,000 ft) a.s.l. on 5 March. Source: Wellington Volcanic Ash Advisory Center (VAAC)
Arenal (Costa Rica) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Arenal Central America Volcanic Arc	OVSICORI-UNA reported that during February activity originating from Arenal's Crater C consisted of gas emissions, sporadic Strombolian eruptions, and occasional avalanches. A lava flow traveled down the SW flank. Acid rain and small amounts of ejected pyroclastic material affected the NE and SE flanks. Avalanches from the crater and from lava-flow fronts traveled down the SW, S, and SE flanks, occasionally igniting vegetation. Crater D produced only fumarolic activity. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
Batu Tara (Indonesia) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Batu Tara Sunda Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that during 8-9 March ash plumes from Batu Tara rose to altitudes of 1.5-2.4 km (5,000-8,000 ft) a.s.l. and drifted 45-120 km W and NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Kīlauea (United States) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 3-9 March, HVO reported an active lava surface about 200 m below a vent in the floor of Kīlauea's Halemaʻumaʻu crater. The lava surface circulated and both rose and drained through a pit in the cavity floor. A plume from the vent drifted mainly SW, dropping small amounts of ash downwind. Measurements during 4-5 March indicated that the sulfur dioxide emission rate at the summit remained elevated at 700-800 tonnes per day. The 2003-2007 average rate was 140 tonnes per day. Lava from beneath the Thanksgiving Eve Breakout (TEB) and rootless shield complex flowed SE through the upper portion of a lava tube system and broke out onto the surface. Thermal anomalies detected by satellite, and visual observations, revealed active lava flows on the pali and on the coastal plain. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that during 26 February-5 March seismic activity from Kliuchevskoi was above background levels and lava continued to flow down the NW flank. Strombolian activity periodically ejected material 300 m above the crater, and phreatic explosions occurred from the fronts of the lava flows. Steam-and-gas plumes rose to an altitude of 6.8 km (22,300 ft) a.s.l. most days, and on 3 March one drifted 50 km NE. Satellite imagery revealed a large daily thermal anomaly from the volcano. The Aviation Color Code level remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Santa María (Guatemala) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Santa María Central America Volcanic Arc	On 4 March, INSIVUMEH reported that explosions from Santa María's Santiaguito lava dome complex produced ash plumes that rose to altitudes of 2.7-3 km (8,900-10,000 ft) a.s.l. and drifted E. Ash fell in inhabited areas downwind. The Washington VAAC reported that on 8 March an ash plume was seen in satellite imagery drifting WNW. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 26 February-5 March seismic activity from Shiveluch was above background levels, possibly indicating ash plumes rising to an altitude of 6 km (19,700 ft) a.s.l. Fumarolic activity was occasionally observed. Analyses of satellite imagery revealed a large daily thermal anomaly from the lava dome, and ash plumes that drifted 30 km NE on 26 February and 130 km SE on 28 February. Ash fell in Klyuchi, 50 km SW, on 26 February. On 3 March, a second thermal anomaly on the S flank was noted. Based on information from KVERT and analyses of satellite imagery, the Tokyo VAAC reported that during 5 and 8-9 March ash plumes rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted E and SE. The Aviation Color Code level remained at Orange. Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Soufrière Hills (United Kingdom) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Soufrière Hills Lesser Antilles Volcanic Arc	MVO reported that during 26 February-5 March activity from the Soufrière Hills lava dome was at a low level. A swarm of seven relatively large hybrid earthquakes was detected early on 4 March. Later that morning, two small pyroclastic flows descended the Tar River valley and caused ashfall in Salem and Olveston, 6-8 km NW. The Hazard Level remained at 3. Source: Montserrat Volcano Observatory (MVO)
Tungurahua (Ecuador) | 3 March-9 March 2010 | Continuing Eruptive Activity Cite this Report
Tungurahua Northern Andean Volcanic Arc	The IG reported that on 2 March an ash plume from Tungurahua rose to an altitude of 8.5 km (28,000 ft) a.s.l. and drifted NW. Although inclement weather often prevented observations of the volcano during 3-9 March, fumarolic activity in the crater was seen on 6 and 8 March. Ash fell in areas to the SW on 3 and 4 March. 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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