Activity for the week of 3 May-9 May 2006
The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.
New Activity / Unrest
| Central Kamchatka (Russia)
| 55.972°N, 160.595°E
| Elevation 2882 m
During 28 April to 5 May, Bezymianny's lava dome continued to grow. Seismicity was above background levels during 30 April to 3 May. Incandescent avalanches were visible on 4 May. At the lava dome, fumarolic activity occurred and thermal anomalies were visible on satellite imagery. Bezymianny was at Concern Color Code Yellow, which meant an explosive eruption was possible in the following 4 weeks. On 7 May the Concern Color Code was raised to Orange due to an increase in seismicity and the number of incandescent avalanches (14 occurred on 6 May in comparison to 4-6 during the previous 2 days). Intense fumarolic activity occurred, with occasional small amounts of ash. KVERT reported that an explosive eruption was possible in the next 1 or 2 weeks. On 9 May around 1935, the Concern Color Code was raised to Red, the highest level, due to increased seismicity and incandescent avalanches. A gas plume rose higher than 7 km (23,000 ft) a.s.l. and a strong thermal anomaly was visible on satellite imagery. An explosive eruption was expected in the next 1 or 2 days.
An explosive eruption occurred at Bezymianny on 9 May during 2121 to 2145. The explosion produced an ash column that rose to a height of ~15 km (49,200 ft) a.s.l. A co-ignimbrite ash plume was about 40 km in diameter and mainly extended NE of the volcano. On 10 May around 0100, seismicity returned to background levels and the Concern Color Code was reduced to Orange. Small fumarolic plumes were observed during the early morning of the 10th and lava probably began to flow at the lava dome.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Central Java (Indonesia)
| 7.54°S, 110.446°E
| Elevation 2910 m
CVGHM reported that on 6 May, gas plumes rose to 800 m above Merapi (or 12,300 ft a.s.l.) and 18 incandescent avalanches of volcanic material were observed. On 7 May, 26 incandescent avalanches that extended about 100 m were seen during the morning. Incandescence was seen at the summit ten times. On 6 and 7 May, the lava dome continued to grow and seismicity was dominated by multi-phase earthquakes. Shallow volcanic earthquakes and signals from landslides and rockfalls were also recorded. On 8 May, the Darwin VAAC reported that CVGHM warned of a plume rising to ~3.7 km (12,000 ft) a.s.l. No ash was visible on satellite imagery. Merapi remained at Alert Level 3 (on a scale of 1-4), as it has since 12 April.
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)
| Bougainville (Papua New Guinea)
| 6.137°S, 155.196°E
| Elevation 1855 m
On 4 May, satellite imagery showed an ash plume from Bagana at a height of ~3 km (10,000 ft) a.s.l. extending 4 km W.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Andaman Islands (India)
| 12.278°N, 93.858°E
| Elevation 354 m
On 3 May, low-level ash plumes from Barren Island were visible on satellite imagery extending N.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Chuginadak Island (USA)
| 52.825°N, 169.944°W
| Elevation 1730 m
On the morning of 2 May beginning at 0101, a thermal anomaly and continuous plume from Cleveland were seen on satellite imagery. The plume extended ~50 km SW of the volcano and was visible on satellite imagery for about 6 hours. Satellite data suggested a maximum cloud height of ~1 km (3,500 ft) a.s.l. There was no indication of ash in the observed cloud. No further activity was detected at Cleveland after 2 May. Cleveland was not assigned a Concern Color Code because there is no real-time seismic network at the volcano to monitor seismic changes.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| 1.22°N, 77.37°W
| Elevation 4276 m
INGEOMINAS reported that Galeras remained at a critical state during 1-8 May, with a partially solidified lava dome in the main crater and low levels of seismicity. The sulfur-dioxide flux continued at very low levels. Galeras remained at Alert Level 2 (likely eruption in days or weeks).
Source: Servicio Geológico Colombiano (SGC)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 4-8 May, lava from Kilauea continued to flow off of a lava delta into the ocean at the East Lae`apuki entry. No surface lava flows were visible on the Puluma pali fault scarp, as has been the case since 8 February. Low-level volcanic tremor was recorded at Kilauea's summit, accompanied by a few small earthquakes. Volcanic tremor reached moderate levels at Pu`u `O`o. Small amounts of inflation and deflation occurred at the volcano.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 16.507°S, 168.346°E
| Elevation 1413 m
Based on information from a pilot report, the Wellington VAAC reported that on 7 May a small ash plume from Lopevi was visible below a height of ~3 km (10,000 ft) a.s.l. and an active lava flow was observed at the volcano.
Source: Wellington Volcanic Ash Advisory Center (VAAC)
| Papua New Guinea
| 4.08°S, 145.037°E
| Elevation 1807 m
On 8 May, an ash plume from Manam was visible on satellite imagery at a height of ~3 km (10,000 ft) a.s.l.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| United States
| 46.2°N, 122.18°W
| Elevation 2549 m
Growth of the new lava dome inside the crater of Mount St. Helens continued during 4-8 May, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. The dome-building eruption that began in October 2004 continued at the same pace as in previous weeks, accompanied by low background levels of seismicity and other eruption indicators. A GPS (Global Positioning System) instrument on the new lava dome W of the vent continued to move W nearly 1 m per day. St. Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
During 4-8 May, small-to-moderate explosions at Tungurahua produced plumes composed of gas, steam, and small amounts of ash. Seismicity was at relatively high levels and was dominated by signals from long-period earthquakes and explosions.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
| 16.355°S, 70.903°W
| Elevation 5672 m
Based on information from significant meteorological advisories (SIGMET), the Buenos Aires VAAC reported that ash emitted from Ubinas during 4-8 May rose to a maximum height of ~6.7 km (22,000 ft) a.s.l.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
News Feeds and Google Placemarks
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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 Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. At the end of each report is a list of the sources used. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. This feature was first made available on 5 March 2008.
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A Google Earth network link for the Weekly Volcanic Activity Report can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano profile page and to the complete Weekly Report for that week. This feature was first made available on 1 April 2009.
Criteria & Disclaimers
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 more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. 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.
Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.
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 receive a report.
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 monthly, and more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. 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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