Activity for the week of 8 August-14 August 2001
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
| Honshu (Japan)
| 35.233°N, 139.021°E
| Elevation 1438 m
Elevated seismicity had been recorded at Hakone during June 2001 to at least 8 August. The seismicity was associated with a small amount of inflation that was centered at the volcano. Earthquake hypocenters occurred at depths less than 5 km beneath the volcano. A small swarm was also recorded under the northern end of the Ashino-ko (caldera lake). JMA noted that the change in activity might not be a precursor to an eruption since similar activity has occurred in the past that was not followed by an eruption.
Source: Volcano Research Center-Earthquake Research Institute (University of Tokyo)
| Luzon (Philippines)
| 13.257°N, 123.685°E
| Elevation 2462 m
A decline in seismic and volcanic activity occurred at Mayon beginning on 8 August. The level of seismicity remained above background, but declined to non-eruptive conditions. The volcano's edifice was less inflated than during previous weeks. Continuing low-level activity in the crater area produced a high SO2 emission rate and visible incandescence. On 9 August PHIVOLCS decreased the Alert Level from 5 (the highest) to 4. The 6-km-radius Permanent Danger Zone and the 7-km-radius Extended Danger Zone remained in effect.
Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Inquirer.net
| Central Kamchatka (Russia)
| 55.972°N, 160.595°E
| Elevation 2882 m
Volcanic activity decreased after an eruption at Bezymianny on 7 August at 1128. Later in the day, smaller explosions produced ash clouds that rose to 2 km above the dome. Seismic activity was above background levels on 7-8 August, with many small earthquakes occurring within the volcano's edifice and several different seismic signals (explosion, avalanche, collapse) recorded locally. On 9 August a three-pixel thermal anomaly was visible on satellite imagery. The anomaly represented a viscous lava flow that had formed at the dome of the volcano. On 9 August the Concern Color Code was reduced from Red (the highest level) to Yellow and was further reduced on 10 August to Green (the lowest level).
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Sicily (Italy)
| 37.748°N, 14.999°E
| Elevation 3295 m
As of 13 August lava flows appeared to cease advancing down the slopes of Etna. Slight degassing occurred from many of the fissures and the rate of SO2 emission was low in comparison to average values for the season.
Sources: BBC News, Etna Volcan Sicilien (Charles Rivière)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
Small amounts of lava continued to enter the ocean at the E Kupapa`u entry. Surface lava flows were observed issuing from the eastern tube of the current flow field. One of the lobes of lava reached ~1.1 km short of the coast. Generally, weak, rather steady tremor and a few small earthquakes continued beneath Kilauea's caldera. Near Pu`u `O`o, continuous tremor occurred at weak-to-moderate levels. Tiltmeters across the volcano showed no significant deformation.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Luzon (Philippines)
| 15.13°N, 120.35°E
| Elevation 1486 m
Several news reports stated that rising water in Pinatubo's crater is now approaching dangerous levels. If the water exceeds the crater lip, it could cause the crater to partially collapse and water could inundate the town of Botolan. The town is 40 km NW of the volcano and has 46,000 residents. In recent weeks the water surface has risen from ~6.4 to 5 m below the crater lip. Scientists are worried that the intense rain during the current rainy season will cause the water level to continue to rise. In the next few weeks, with oversight by Philippine officials and geologists, local residents will dig a 5-m notch in the side of the crater that will drain the water away from inhabited areas.
Sources: Associated Press, Philippine Institute of Volcanology and Seismology (PHIVOLCS), Reuters, Disaster Relief.org
| 19.023°N, 98.622°W
| Elevation 5393 m
The number of small emissions composed of steam, gas, and small amounts of ash increased in comparison to the previous week. The Washington VAAC reported an ash emission on 9 August at 2300 produced an ash cloud that rose to 7.6 km a.s.l. According to CENAPRED, the increase in activity may have been related to several days of intense rain in the area.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
During the week seismic activity remained above background levels, with many small earthquakes occurring within the volcano's edifice and several different seismic signals (explosion, avalanche, collapse) recorded locally. Small gas-and-steam plumes rose to 200 m above the dome. Thermal anomalies were seen in several areas on satellite imagery. The volcano remained at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 16.72°N, 62.18°W
| Elevation 915 m
During the week volcanic activity was low at Soufrière Hills. Small-scale rockfalls and minor pyroclastic flows occurred mainly off of the sides of the scar left after the partial dome collapse on 29 July. Like the previous week, a new dome was seen growing within the scar.
Source: Montserrat Volcano Observatory (MVO)
| 1.467°S, 78.442°W
| Elevation 5023 m
Ongoing eruptions occurred at Tungurahua since at least 6 August at 0703, sending steam-and-ash clouds to 7.5-11.6 km a.s.l. The ash clouds primarily drifted towards the W. On 13 August three particularly strong emissions occurred at about 0630, 1200, and 1315. Afterward, two distinct areas of ash were visible in satellite imagery; one contained ash from the strong emissions, rose to ~11.6 km a.s.l. and drifted to the E; the other ash cloud was fed from continuous emissions and possibly rose to ~10 km a.s.l. and drifted to the SW.
Sources: Associated Press, Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
| 39.42°S, 71.93°W
| Elevation 2847 m
Volcanic activity at Villarrica was at relatively normal levels as of 9 August. The amount of incandescent lava decreased in comparison to the amount observed during 19 and 22 July. Strong degassing occurred and ejections of ash, lapilli, and volcanic bombs landed on the W to SW edge of the crater.
Source: Villarrica Volcano Visual Surveillance Project
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.