Activity for the week of 8 June-14 June 2005
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
| New Britain (Papua New Guinea)
| 5.525°S, 148.42°E
| Elevation 1330 m
According to the Darwin VAAC, low-level ash plumes emitted from Langila were visible on satellite imagery during 8-13 June. RVO reported to the Darwin VAAC that fluctuating, moderate eruptive activity was expected to continue at the volcano.
The International Federation of Red Cross and Red Crescent Societies (IFRC) reported that eruptive activity occurred at Langila on 2 June with more ash than normal being emitted from the volcano. Prevailing winds carried most of the initial ashfall to the sea, but lower-level winds redirected the ash back onto the island. About 10,000 people live near the volcano and there were reports of increased cases of respiratory problems and eye irritation. During an aerial inspection of the area on 6 June, IFRC determined that ~3,490 people had been affected by the eruption, mainly in the villages of Aitavala, Masele, Kilenge, Ongaea, Potne, and Sumel, but also to a lesser extent in Vem, Galegale, Tauale, and Laut. Ashfall damaged small food gardens and contaminated some water sources. The provincial government encouraged voluntary evacuation of affected areas.
Sources: Darwin Volcanic Ash Advisory Centre (VAAC), International Federation of Red Cross and Red Crescent Societies (IFRC)
| Mariana Islands (USA)
| 16.35°N, 145.67°E
| Elevation 790 m
On 11 June beginning at 1622 there were three explosions at Anatahan. The explosions produced a dense ash cloud that rose to ~13.7 km (44,900 ft) a.s.l., making it the second highest rising plume from an eruption at Anatahan since its first historical eruption in 2003. On 12 June, seismicity was at moderately high levels, with periods of high tremor and frequent small long-period earthquakes. Also, satellite imagery showed an ash cloud at a height of ~3 km (10,000 ft) a.s.l.
Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
| Bougainville (Papua New Guinea)
| 6.137°S, 155.196°E
| Elevation 1855 m
During 8-10 June, several low-level plumes emitted from Bagana were visible on satellite imagery. They extended predominately to the WSW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 19.514°N, 103.62°W
| Elevation 3850 m
On 6 June at 2305 an explosion from Colima produced an ash plume to a height of ~8.5 km (27,900 ft) a.s.l. The ash plume traveled SW at a speed of ~70 km/hour, and ash fell in and around the cities of Colima (~30 km away) and Villa de Alvarez. On 11 June Universidad de Colima reported that a small lava dome was visible in Colima's crater. According to news articles, nearly 50 people who were evacuated from near the volcano during the previous week returned to their homes on 13 June.
Sources: Associated Press, Associated Press, Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima, Washington Volcanic Ash Advisory Center (VAAC)
| 1.22°N, 77.37°W
| Elevation 4276 m
At Galeras during 6-13 June, there were low levels of seismicity, small amounts of deformation, and moderate gas emissions from the main crater. The alert remained at level 3 (changes in the behavior of volcanic activity have been noted).
Source: Servicio Geológico Colombiano (SGC)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
Due to a decrease in seismic and volcanic activity during 3-10 June, KVERT decreased the Concern Color Code at Karymsky from Orange to Yellow. During the report week, seismicity decreased to slightly above background levels, and 25-80 shallow earthquakes occurred daily. A weak gas-and-steam plume was observed on 4 June.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
Lava entered the sea at two points along Kilauea's S flank during 8-12 June, and at three points on 13 June. During the report period, surface lava flows were visible on the Pulama pali fault scarp. Volcanic tremor remained above normal levels at Kilauea's summit and at moderate levels at Pu`u `O`o. Small amounts of deformation were recorded during the report week.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Southern Kamchatka (Russia)
| 52.449°N, 158.196°E
| Elevation 2288 m
The Concern Color Code at Mutnovsky was reduced from Yellow to Green during 3-10 June. There were no significant changes in volcanic activity during the week. A thermal anomaly was observed at the volcano on satellite imagery, possibly due to the heat from a thermal field.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 0.077°S, 77.656°W
| Elevation 3562 m
During the last week of May, there was an increase in the number of long-period earthquakes at Reventador associated with a new lava flow. A lava flow emitted previously continued to travel SE towards the Marquer and Montana rivers. During 2-3 June, incandescence was visible in the crater. On 6 June ash-and-gas plumes were emitted from the volcano.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
During 3-10 June, two shallow M 1.6-1.7 earthquakes occurred 0-5 km beneath Shiveluch's active lava dome. On 7 June, gas-and-steam plumes rose as high as 100 m above the 2.5-km-high lava dome (8,500 ft a.s.l.). A persistent thermal anomaly was visible at the lava dome all week. Shiveluch remained at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 16.72°N, 62.18°W
| Elevation 915 m
On 13 June at 0600 there was an increase in volcanic and seismic activity at Soufrière Hills. A series of volcano-tectonic earthquakes was accompanied by low-level tremor and a period of ash venting. An ash plume reached a height of ~2.4 km (7,900 ft) a.s.l and drifted NE, depositing light ash in Lookout, Geralds, and St. Peters. Activity decreased significantly after 0900.
Prior to the activity increase, during 3-10 June, the seismic network at Soufrière Hills recorded 17 volcano-tectonic earthquakes and one rockfall. Steam venting continued on the NW side of the crater. The daily recorded sulfur-dioxide flux varied from a low of 142 metric tons per day (t/d) on 4 June to a maximum of 671 t/d on 7 June, with an average of 399 t/d for the week. This was below the eruption's long-term average of 500 t/d.
Source: Montserrat Volcano Observatory (MVO)
| United States
| 46.2°N, 122.18°W
| Elevation 2549 m
During 8-13 June, growth of the new lava dome inside the crater of Mount St. Helens continued, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. Seismic and deformation data continued trends similar to the previous few weeks, with small earthquakes every ~5 minutes, little to no movement of the old lava dome, minor movement of the N end of the new lava dome, and continued growth of the lava spine. 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 7-13 June, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy plumes were emitted that were composed of gas, steam, and occasionally small amounts of ash. On 7 June fine ash fell in the Puela sector, ~8 km SW of the volcano.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
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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