Activity for the week of 7 May-13 May 2003
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
| Mariana Islands (USA)
| 16.35°N, 145.67°E
| Elevation 790 m
On 10 May around 1700 an eruption began at Anatahan, a volcanic island which has had no historically documented eruptions. Scientists on a small ship about 10 km away saw an ash plume that eventually rose to ~12 km a.s.l. The eruption occurred primarily from Anatahan's eastern crater and observers did not see lava flows. No precursory activity was recorded (the island of Anatahan is uninhabited and lacks working seismometers) and no signs of the impending eruption were seen by scientists who visited the island on 6 May.
According to the Washington VAAC, an ash cloud was visible on satellite imagery beginning around 1730 on 10 May. The next day around 0655 ash was seen moving in three different directions; WNW at a height around 5.5 km a.s.l., SW around 8.5 km a.s.l., and two separate and smaller ash plumes were drifting SE at heights around 13.4 km a.s.l.
Local authorities issued a special advisory on 11 May stating that ". . . the general public especially fisherman, tour operators and commercial pilots are advised to stay away from the island of Anatahan until further notice from the Office of Emergency Management." As of 13 May ash emissions continued and a hot spot was visible on satellite imagery. Residents of the small island of Anatahan (part of the United States Commonwealth of the Northern Mariana Islands) were evacuated in 1990 after a shallow earthquake swarm. The most recent reported seismicity occurred in 1993.
Sources: The Margins Mariana Subduction Factory Imaging Project Research Team (from Washington University, St. Louis; Scripps Inst. of Oceanography; and CNMI Emergency Management Office), US Geological Survey Hawaiian Volcano Observatory (HVO), Washington Volcanic Ash Advisory Center (VAAC), Marianas Variety, Voice of America News
| 0.077°S, 77.656°W
| Elevation 3562 m
Heavy rainfall (200 mm in less than 24 hours) at Reventador on 6 May led to the remobilization of ash that was deposited on the volcano's flanks during the November 2002 eruption. Lahars traveled down the volcano's SE flank via Marker and Reventador gorges. According to IG, seismic signals indicated that lahars occurred in seven main pulses, with the longest pulse lasting ~2 hours. Lahars crushed a portion of the sole petroleum pipeline in Ecuador, located on the volcano's SE flank, and dragged it 22 m. According to news reports, about 5,600 barrels of crude oil escaped the damaged pipeline and entered Reventador River. News reports also stated that a large area of the Amazon jungle was polluted. Lahars also destroyed a bridge and blocked a highway that crosses the Amazon.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Reuters, El Comercio, IRIB News
| Paramushir Island (Russia)
| 50.324°N, 155.461°E
| Elevation 1781 m
The eruption that began at Chikurachki on 18 April continued through 9 May. On 1 May ash fell in the town of Severo-Kurilsk, ~60 km from the volcano. On 3 May weak fumarolic activity was seen, and on 5 May an ash-rich plume was observed extending to the NW. Chikurachki was at Concern Color Code Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 19.514°N, 103.62°W
| Elevation 3850 m
During 6-11 May, several ash emissions occurred at Colima. Based on information from the Mexico City MWO, the Washington VAAC reported that the largest eruption during the report period occurred on 6 May and produced an ash cloud to ~6 km a.s.l. In addition, lava flows traveled down the volcano's S flank.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| Siau Island (Indonesia)
| 2.781°N, 125.407°E
| Elevation 1797 m
On 22 April at 1802 an ash explosion occurred at Karangetang that was accompanied by the ejection of incandescent volcanic material. The resultant ash column rose to ~1,750 m above the volcano, and incandescent material was ejected to ~750 m above the volcano. Ash was deposited on the volcano's W slope, including in the villages of Lehi, Mini, Kinali, and Hiung. The explosion was followed by lava avalanches to the W and S and pyroclastic flows toward Batang River to a runout distance of 2,250 m. Another explosion occurred on 24 April that produced an ash cloud to ~750 m above the volcano. Generally, during 21 April to 4 May, low-level ash plumes rose above South Crater, and glowing was seen up to 25 m above the crater. Karangetang remained at Alert Level 3 (on a scale of 1-4).
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
During 2-9 May, intermittent explosive eruptive activity continued at Karymsky and seismicity was at background levels. Karymsky remained at Concern Color Code Yellow.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
Lava continued to flow down Kilauea's S flank, with small surface flows visible. On 12 May lava began to enter the sea again at the West Highcastle lava delta. Generally, seismicity was at normal to below normal levels, with very few earthquakes. Volcanic tremor at Pu`u `O`o remained at moderate-to-high levels.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| Luzon (Philippines)
| 13.257°N, 123.685°E
| Elevation 2462 m
On 6 May at 0721 a small explosion occurred at Mayon. The brownish ash-and-steam column produced from the explosion rose about 450 m above Mayon's summit crater and drifted SW. No significant seismicity was recorded prior to the explosion. Electronic tiltmeters on the N and S flanks continued to show inflation of the volcanic edifice. Likewise, a leveling survey conducted on 24 April showed a general inflation of the N flank. Mayon remained at Alert Level 1 (on a scale of 0-5). PHIVOLCS emphasized that the 6-km-radius Permanent Danger Zone remained in effect.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
| DR Congo
| 1.52°S, 29.25°E
| Elevation 3470 m
On 2 and 3 May a dense ash plume was visible from the town of Goma rising above Nyiragongo. Continuous ash fall occurred in many villages close to the volcano, and permanent tremor and long-period earthquakes were recorded. During a visit to the volcano during 6 and 7 May scientists saw that the lava pool in the crater was very active, with violent gas outbursts, projection of spatter and surges, and lava splashing the walls of the pit. Occasionally, large (~ 50 m high) flames were hurled from the vents. SO2 emission rates were relatively high during 1-6 May, with the largest emission (~50,000 tons) occurring on 3 May. According to the Toulouse VAAC, a possible ash cloud was visible on satellite imagery on 12 May that remained at a height below 6 km.
Sources: Goma Volcano Observatory (GVO), Toulouse Volcanic Ash Advisory Centre (VAAC)
| 19.023°N, 98.622°W
| Elevation 5393 m
During 7-10 May, moderate emissions of mainly gas and steam occurred at Popocatépetl. In addition, isolated episodes of low-amplitude harmonic tremor were occasionally recorded. No signs of a new lava dome were seen during a flight over the volcano on 20 April.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
| 16.72°N, 62.18°W
| Elevation 915 m
During 25 April to about 6 May, volcanic activity was at moderate levels at Soufrière Hills, with pyroclastic flows and rockfalls mainly traveling NE. During about 6-9 May there was a general increase in the size of pyroclastic flows, some of which were among the largest and most energetic seen for several months. Most flowed along the N side of the Tar River Valley, and a few also flowed into White's and Tuitt's ghauts. Sulfur-dioxide emission rates were low during about the first week of the report period, then fluctuated from moderate to high levels. The Washington VAAC reported that low-level ash plumes were sometimes visible on satellite imagery.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
Based on information from IG, the Washington VAAC reported that a small explosion at Tungurahua on 6 May produced a cloud composed mainly of gas, with some ash. The cloud drifted W and seismic activity decreased after the explosion.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
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.
5. USGS Disclaimer Statement for this Website:
Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.
Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.
For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)
U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
Contact: USGS Web Team
USGS Privacy Statement
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.