Activity for the week of 28 June-4 July 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
| Komba Island (Indonesia)
| 7.791°S, 123.585°E
| Elevation 633 m
Based on a pilot report, the Darwin VAAC reported that an ash cloud from Batu Tara reached an altitude of 1.5 km (5,000 ft) a.s.l. and drifted NW. Ash was not identified on satellite imagery.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Luzon (Philippines)
| 12.769°N, 124.056°E
| Elevation 1535 m
Based on interpretations of seismic data, small explosions occurred at Bulusan on 28 and 29 June. No ashfall was reported.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
| 16.72°N, 62.18°W
| Elevation 915 m
Due to increased seismic activity at Soufrière Hills during approximately 24-29 June, the Alert Level was raised to 4 (on a scale of 0-5). On 30 June around 1300, the lava dome partially collapsed and produced pyroclastic flows to the E. According to the Washington VAAC, a pilot reported that an ash plume reached an altitude of 3 km (10,000 ft) a.s.l. and drifted NW. The VAAC also reported that the Montserrat Volcano Observatory indicated a second dome collapse occurred at 1830 on 30 June that also generated ash plumes to altitudes of 3 km (10,000 ft) a.s.l.
Sources: Associated Press, Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC), Antigua Sun [Original URL no longer exists 1/2017], Radio Jamaica
| 14.473°N, 90.88°W
| Elevation 3763 m
On 29 June, INSIVUMEH reported that pyroclastic flows from Fuego traveled mainly SW along the Ceniza River and a lesser number moved SW along the Taniluyá River. According to a news report, on 29 June an ash plume reached a height of 2.2 km above the summit (19,500 ft a.s.l.) and drifted W. On 3 July, explosions propelled incandescent material hundreds of meters above the central crater (~13,000 ft a.s.l.). Avalanches traveled ~300-500 m SW along the Ceniza River.
Sources: Associated Press, Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
| Siau Island (Indonesia)
| 2.781°N, 125.407°E
| Elevation 1797 m
According to the Darwin VAAC, a small eruption at Karangetang on 3 July produced an ash plume observed on satellite imagery that reached an altitude of 3.7 km (12,000 ft) a.s.l.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
Activity at Karymsky continued during 23-30 June, with 100-350 shallow earthquakes occurring daily. Based on interpretations of seismic data, ash plumes reached altitudes of 3.5 km (11,500 ft) a.s.l. According to the Tokyo VAAC, the Kamchatkan Experimental and Methodical Seismological Department (KEMSD) reported that on 1 and 3 July ash plumes reached altitudes of 3.7 km (12,000 ft) a.s.l. A thermal anomaly in the crater was observed during 24-27 June. Karymsky remained at Concern Color Code Orange.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 28 June-4 July, lava from Kilauea continued to flow off of a lava delta into the ocean at the East Lae`apuki entry. On 30 June, surface lava flows originating from the Campout lava tube were visible on the upper part of the Pulama pali fault scarp, which had not been the case since 8 February. Incandescence was visible from Drainhole vent in Pu`u `O`o's crater during most of the reporting period. Tremor remained at a very typical moderate level at Pu`u `O`o.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Central Java (Indonesia)
| 7.54°S, 110.446°E
| Elevation 2910 m
According to CVGHM, pyroclastic flows and rockfalls at Merapi decreased in frequency and intensity during 28 June-4 July. Pyroclastic flows were observed during 28-30 June and reached a maximum distance of 3 km SE along the Gendol River. Gas plumes were observed during 28 June-1 July and reached a maximum height of 1 km above the summit (12,800 ft a.s.l.) on 28 June.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| 14.757°N, 91.552°W
| Elevation 3745 m
According to the Washington VAAC, on 1 July small ash plumes from Santa María's Santiaguito lava-dome complex reached altitudes of 5.8 km (19,000 ft) a.s.l. and drifted SW. On 3 July, INSIVUMEH reported that an ash plume reached ~800 m above the summit (~15,000 ft a.s.l.). White "smoke" from an incandescent avalanche deposit was visible from the NE base of Caliente cone.
Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (VAAC)
| Eastern Java (Indonesia)
| 8.108°S, 112.922°E
| Elevation 3657 m
According to the Darwin VAAC, on 29 June a small plume from Semeru that was visible on satellite imagery drifted SE at an unknown altitude.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| United States
| 46.2°N, 122.18°W
| Elevation 2549 m
During 28 June-4 July, the lava dome at Mount St. Helens continued to grow and produce small rockfalls. The volcano remained at Volcano Advisory (Alert Level 2); aviation color code Orange.
Source: US Geological Survey Cascades Volcano Observatory (CVO)
| Ryukyu Islands (Japan)
| 29.638°N, 129.714°E
| Elevation 796 m
Based on information from JMA, the Tokyo VAAC reported on 30 June that a small plume from Suwanose-jima reached an altitude of 1.2 km (4,000 ft) a.s.l. and drifted NE.
Source: Tokyo Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
During 28 June- 4 July, small-to-moderate explosions at Tungurahua produced plumes composed of gas, steam, and small amounts of ash that reached heights of 1.5 km above the summit (21,400 ft a.s.l.). Light ashfall was reported in nearby localities during 29 June-2 July. On 29 June, reports of ground movement coincided with an explosive eruption that generated blocks of incandescent material observed to roll 100 m down the W flank. Night-time incandescence was observed intermittently during the reporting period.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
| 16.355°S, 70.903°W
| Elevation 5672 m
Based on pilot reports, ash clouds identified from Ubinas on 28 June reached altitudes of 6.7 km (22,000 ft) a.s.l.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
News Feeds and Google Placemarks
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. 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.
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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 page for that volcano and to the complete Weekly Report for that week.
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.
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An RSS (Really Simple Syndication) feed for the Weekly Volcanic Activity Report first made available on 5 March 2008 can be utilized with the aid of various free downloadable readers. The report content of the news 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. 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. On 12 March 2009, GeoRSS tags were added so that the latitude and longitude for each volcano could be included with the feed.
At the end of each individual report is a list of the sources used. We would like to emphasize that the World Organization of Volcano Observatories (WOVO) website (http://www.wovo.org/) lists the regional volcano observatories that have the most authoritative data for many of these events.
CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management.
Google Earth Placemarks
A Google Earth network link for the Weekly Volcanic Activity Report was first made available on 1 April 2009. This file 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 page for that volcano and to the complete Weekly Report for that week.