Activity for the week of 7 July-13 July 2004
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
| Flores Island (Indonesia)
| 8.676°S, 122.455°E
| Elevation 1661 m
During 5-11 July, observers watching Egon volcano saw it emit white plumes of variable density that typically rose 25-75 m above the summit. The seismograph recorded a continuous series of 'emission earthquakes' with amplitudes of 2 mm. Egon's hazard status remained at Alert Level 2 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| Mariana Islands (USA)
| 16.35°N, 145.67°E
| Elevation 790 m
Seismicity continued at a high level at Anatahan following a slight decline from near-peak levels on 2 July. Observers correlated the seismic activity on July 9 and 12 with Strombolian explosions that ejected tephra about 100 m above the vent at intervals ranging from a few tens of seconds to minutes. An ash plume extending generally westward a few tens of kilometers downwind from Anatahan below ~3 km a.s.l. was observed by scientists visiting the volcano for much of the week.
Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
| Costa Rica
| 10.463°N, 84.703°W
| Elevation 1670 m
Since an eruption during the evening of 6 July sent an avalanche of lava cascading down the side of Arenal volcano, no subsequent activity has been reported. According to news reports, on 7 July, Costa Rica's National Emergency Commission (CNE) issued an alert and prohibited people from approaching the volcano.
Source: Agence France-Presse (AFP)
| 19.514°N, 103.62°W
| Elevation 3850 m
Low-level activity continued at Colima, with an average of three ash explosions occurring daily. The most significant events occurred on 7 and 11 July. The ash columns were all less than 2 km above the volcano (under ~6 km a.s.l.).
Source: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima
| 14.473°N, 90.88°W
| Elevation 3763 m
On 7 July, an explosion from Fuego generated an avalanche of lava fragments near the headwaters of Santa Teresa ravine. Forty-three weak to moderate explosions were observed during 10-11 July; the explosions produced ashy plumes less than 2 km above the ground that were blown west-southwest at least 20 km from the volcano.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
During 3-9 July, seismicity at Karymsky was above background, with 400-800 shallow earthquakes occurring. Based on interpretations of seismic data, daily ash-and-gas explosions may have risen 2-4.5 km a.s.l. Karymsky remained at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
Lava continued to flow through lava tubes from the Pu`u `O`o vent 12 km to the sea during 7-13 July. Lava spilled onto the surface from several skylights along the path of the tube system and spread across the slowly growing lava delta along the volcano's south shoreline. Volcanic tremor at Pu`u `O`o was at moderate-to-high levels, but no tremor was recorded at the summit. A relatively large deflation event at Pu`u `O`o on 11 July produced no apparent change in lava discharge.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 14.757°N, 91.552°W
| Elevation 3745 m
During 8-12 July weak to moderate explosions continued at the Santa Maria lava-dome complex, generating ash plumes as high as ~1.5 km above the volcano. Numerous avalanches of lava during 8-9 and 12 July formed small pyroclastic flows down the sides of Caliente dome.
Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
The lava dome continued to grow in Shiveluch's active crater. Gas-and-steam plumes were reported by KVERT on 2-3 July rising as high as 3.3 km a.s.l.; clouds obscured the volcano during 3-8 July. Seismicity was above background levels for 3-9 July. Shiveluch remained at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Fox Islands (USA)
| 54.756°N, 163.97°W
| Elevation 2857 m
Low-level seismic activity characterized by weak but continuous tremor continued at Shishaldin during 7-13 July. No volcanic activity was observed at the volcano during clear weather, but AVO reported that satellite data indicated the crater to be warmer than the surrounding ground surface. Shishaldin remained at Concern Color Code Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| 16.72°N, 62.18°W
| Elevation 915 m
During 2-9 July, low-level activity continued at Soufrière Hills. MVO reported 4 volcano-tectonic earthquakes, 8 hybrid earthquakes, and 10 rockfalls. Emission rates of sulphur dioxide gas (120 to 160 tonnes per day) reached the lowest levels since the collapse event of 12-13 July 2003.
Source: Montserrat Volcano Observatory (MVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
The volcanic and seismic activity at Tungurahua continued at moderate levels, including small explosions that resulted in light ash fall on many communities and about 100 long-period earthquakes per day. Incandescence in the crater was observed at night on several occasions.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
| United States
| 56.17°N, 159.38°W
| Elevation 2507 m
Many episodes of short-lived bursts of volcanic tremor continued at Veniaminof during 7-13 July. AVO reported that the tremor correlated well with ash-and-steam plumes as high as 1.5 km a.s.l. Veniaminof remained at Concern Color Code Yellow.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
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.
The CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management. They are similar in content to the RSS feed, but contain no active links.
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.
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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RSS and CAP Feeds
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.