Activity for the week of 8 May-14 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.
| Sicily (Italy)
| 37.748°N, 14.999°E
| Elevation 3295 m
During early May, degassing continued at Etna. It was most pronounced at Bocca Nuova and Northeast craters.
Sources: Italy's Volcanoes, Etna Volcan Sicilien (Charles Rivière)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
During 3-10 May, Karymsky's seismicity remained above background levels and its character suggested that weak ash-and-gas explosions, gas blow-outs, and debris avalanches occurred. By the end of the week seismicity had slightly decreased. Thermal anomalies were visible on satellite imagery. On 9 May a faint ash-and-gas plume was also visible on satellite imagery extending 20 km to the SE. 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
An extremely large deflation episode began at Kilauea's Pu`u `O`o cone on 12 May at about 0720. By 1500 Pu`u `O`o had deflated about 16.5 microradians. Following the onset of deflation at Pu`u `O`o, there was slight deflation at Kilauea's caldera. No new eruptive activity was visible in Pu`u `O`o 's crater. Within a couple of hundred meters of the SW base of Pu`u `O`o, two large ~3-m-wide lava flows were visible that apparently broke out of the upper lava-tube system. By 13 May Pu`u `O`o had deflated 18 microradians, tremor at Pu`u `O`o was higher than preceding the deflation and was accompanied by small earthquakes, background tremor and long-period earthquakes increased at the summit, and no significant deformation was recorded at the volcano.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 19.023°N, 98.622°W
| Elevation 5393 m
During 8-12 May, Popocatépetl emitted small clouds of steam, gas, and generally minor amounts of ash. In addition, episodes of harmonic tremor were recorded. A small explosion on 12 May at 0609 hurled incandescent pyroclasts less than 500 m down the volcano's N flank. Aerial photography taken on 29 April by the Department of Federal Roads and the Ministry of Communication and Transportation revealed a 170-m-diameter lava dome growing in the crater. According to CENAPRED, recent volcanic and seismic activity at Popocatépetl has been related to the growth of this lava dome.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)
| 14.757°N, 91.552°W
| Elevation 3745 m
Based on information from INSIVUMEH, the Washington VAAC reported that small amounts of ash fell near Santa María's summit on 13 May. An ash cloud was visible on satellite imagery drifting SW during the morning and more westerly later in the day. The densest ash was located very close to the summit, with light ash extending SW.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
During 3-10 May, there were several small emissions of gas, steam, and ash at Shiveluch. A short-lived eruption on 5 May at 0945 produced an ash-and-gas plume that rose 1.5 km above the lava dome and was accompanied by a 4-minute-long shallow seismic event. Seismicity during the report period included earthquakes with magnitudes less than or equal to 2.1 at depths of 0-6 km, many local shallow seismic signals (from possible avalanches or weak gas-and-ash explosions), and 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)
| 16.72°N, 62.18°W
| Elevation 915 m
During 3-10 May, the level of volcanism at Soufrière Hills was generally lower at the beginning of the report period than it had been the previous week, but it increased during the 8th to 10th. Growth of the lava dome to the E continued to produce rockfalls and small pyroclastic flows down the E flank. Beginning on 8 May, activity increased and rockfalls and pyroclastic flows were concentrated on the dome's NE flank. Incandescence was visible several nights during the report period.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
During 6-13 May, emissions of gas, steam, and ash continued at Tungurahua. On 12 May at 0116 a small eruption produced a W-drifting column of steam, gas, and ash that rose to an unknown height. Incandescent material was erupted that traveled 1.5 km down the volcano's flank. Three other small explosions occurred on the 12th and four occurred on the 13th. Relatively large amounts of ash fell to the NW in the town of Ambato on the 13th.
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.
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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.