Activity for the week of 22 May-28 May 2002
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
| 19.514°N, 103.62°W
| Elevation 3850 m
According to the Universidad de Colima, as of 27 May strong volcanic tremor continued at Colima, and small explosions and lava avalanches occurred. Also, seismicity was recorded that was associated with landslides and degassing. Incandescent lava avalanches traveled down the SSE flank of the volcano, with sudden increases in incandescence visible for several hours. As of 24 May inflation was recorded at the volcano, but by 27 May no significant deformation was detected. The preventative evacuation of residents in towns on the volcano's SW and SE flanks remained in affect. Colima was at Alert Level 4 (5 is the highest).
Sources: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima, Reuters
| Papua New Guinea
| 4.08°S, 145.037°E
| Elevation 1807 m
The Rabaul Volcanological Observatory stated that the Strombolian eruption from Manam's S crater on 20 May ceased on the same day at about 1400. After that, activity consisted of forceful ash emissions in moderate volumes. The decline in activity led to the reduction in Alert Level from 2 ("eruption expected within weeks to months") to 1 ("non-threatening, background level"). According to the Darwin VAAC, the ash cloud produced from the 20 May eruption was no longer visible on satellite imagery by 22 May at 1515. People were reminded to be cautious when near the valleys SE and SW of the volcano.
Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
During 17-24 May, seismicity was above background levels at Karymsky, with ~10 earthquakes occurring per hour. The character of seismicity suggested that weak ash-and-gas explosions, gas blow-outs, and debris avalanches occurred. Thermal anomalies were visible on satellite imagery, but ash was not. Karymsky remained at Concern Color Code Yellow ("volcano is restless").
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 23-24 May, surface lava flows were visible on Kilauea's coastal flat. For several preceding days an intense swarm of small, shallow, long-period earthquakes occurred beneath Kilauea's caldera, at a rate of about one earthquake every 30 seconds. The swarm abruptly ended on 22 May. By the 24th seismicity at Kilauea was at normal background levels. In addition, tiltmeters recorded no unusual deformation, with Pu`u `O`o slowly inflating.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 19.023°N, 98.622°W
| Elevation 5393 m
During 21-28 May, Popocatépetl emitted small clouds of steam, gas, and generally minor amounts of ash. In addition, episodes of harmonic tremor were recorded. On 21 May at 1330 a small explosion occurred that was followed by 15 minutes of high-frequency tremor. According to a news report, a small amount of ash fell on communities neighboring the volcano on 22 May.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Associated Press
| 12.702°N, 87.004°W
| Elevation 1745 m
INETER reported that on 23 May around dawn a vapor column was observed rising above San Cristóbal. The plume was attributed to rain contacting hot material in the crater. There was no indication of an increase in volcanism at San Cristóbal. According to the Washington VAAC, the plume rose ~3 km a.s.l. and drifted to the SW. For the previous few months seismicity had been at moderate levels.
Sources: Instituto Nicaragüense de Estudios Territoriales (INETER), Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
During 17-24 May, there were several small emissions of gas, steam, and ash at Shiveluch. Weak earthquakes occurred at depths of 0-6 km, accompanied by many local shallow seismic signals (from possible avalanches or weak gas-and-ash explosions). There were also episodes of weak intermittent volcanic tremor. Thermal anomalies were visible on AVHRR satellite imagery, but ash was not. Shiveluch remained at Concern Color Code Yellow ("volcano is restless").
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Fox Islands (USA)
| 54.756°N, 163.97°W
| Elevation 2857 m
During 17-24 March, the number of locatable low-frequency seismic events at Shishaldin greatly decreased in comparison to the previous week, returning to background levels. Shishaldin remained at Concern Color Code Green ("volcano is in quiet, "dormant" state").
Source: US Geological Survey Alaska Volcano Observatory (AVO)
| 16.72°N, 62.18°W
| Elevation 915 m
During 17-24 May, the level of volcanism at Soufrière Hills remained similar to that in the previous week. Cloudy conditions obscured visual observations, but lava-dome growth appeared to be concentrated on the volcano's E flank. Numerous rockfalls and small pyroclastic flows traveled to the upper portions of the Tar River Valley. The number of rockfalls increased slightly on the 21st, but declined again on the 23rd.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
During 22-27 May, emissions of gas, steam, and ash continued at Tungurahua. On the 22nd a small explosion produced an ash cloud to a height of 2 km above the volcano.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington 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.
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.
4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.
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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.