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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 23 May-29 May 2007.


















 Activity for the week of 23 May-29 May 2007

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.

Name Location Activity
Bulusan Luzon (Philippines) New
Klyuchevskoy Central Kamchatka (Russia) New
Llaima Chile New
Ritter Island Papua New Guinea New

Aira Kyushu (Japan) Ongoing
Bagana Bougainville (Papua New Guinea) Ongoing
Fuego Guatemala Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Lascar Chile Ongoing
Manam Papua New Guinea Ongoing
Merapi Central Java (Indonesia) Ongoing
Reventador Ecuador Ongoing
Sangay Ecuador Ongoing
Semeru Eastern Java (Indonesia) Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
St. Helens United States Ongoing
Tungurahua Ecuador Ongoing
Ubinas Peru Ongoing


New Activity / Unrest


Volcano index photo  Bulusan  | Luzon (Philippines)  | 12.769°N, 124.056°E  | Elevation 1535 m

According to news articles, scientists from PHIVOLCS conducted an aerial investigation of Bulusan and discovered lahar deposits and three steaming fissures. Lahars were previously reported from the municipalities of Irosin and Juban on 22 May. Scientists also observed steam plumes that rose to altitudes of 1.6-1.7 km (5,200-5,600 ft) a.s.l. and drifted NW and NE. PHIVOLCS reported that the S flank inflated 3 mm.

Sources: ABS-CBN News, GMA News



Volcano index photo  Klyuchevskoy  | Central Kamchatka (Russia)  | 56.056°N, 160.642°E  | Elevation 4754 m

KVERT reported that during 18-25 May, seismic activity at Kliuchevskoi continued above background levels and a thermal anomaly in the crater was detected on satellite imagery. On 18 May, ashfall was reported from the town of Klyuchi, about 30 km to the NE. According to video data and visual observations, Vulcanian activity at the summit crater and phreatic bursts on the NW flank of the volcano were observed during 22-24 May. Ash plumes rose to 5-8 km (16,000-25,600 ft) a.s.l. and drifted SE. Plumes were visible on satellite imagery drifting N, NE, and SE during the reporting period. Clouds inhibited observation on other days. The Level of Concern Color Code remained at Red.

Based on satellite image observations and information from KVERT, the Tokyo VAAC reported that ash emissions produced possible plumes on 26 May to an altitude of 6.4 km (21,000 ft) a.s.l. and on 27 May to an altitude of 10.1 km (33,000 ft) a.s.l. Plumes drifted E, S, SW, and W. Ash plumes were also observed on satellite imagery during 28-29 May drifting S, SW, and W.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Llaima  | Chile  | 38.692°S, 71.729°W  | Elevation 3125 m

Based on a Significant Meteorological Information (SIGMET) advisory and satellite image observations, the Buenos Aires VAAC reported that ash plumes from Llaima rose to altitudes of 3-4.3 km (10,000-14,000 ft) a.s.l. on 26 May. The plumes were visible on satellite imagery drifting E. On 28 May, a pilot reported that an ash plume rose to 5.5-6.7 km (18,000-22,000 ft) a.s.l. and drifted E.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Ritter Island  | Papua New Guinea  | 5.519°S, 148.115°E  | Elevation 75 m

On 30 May, RVO reported observations of Ritter Island following reports of a possible eruption and "sea surges" that destroyed homes on 19 May. On the S part of the island, scorched vegetation was observed and dead marine life (mainly reef fish) was seen around the coast line at heights of 4-6 m a.s.l. There was no evidence of fresh volcanic material, but a new landslide scar extended from the upper most part of the island down to sea level. Several more landslide scars were seen on the W wall. The estimated wave surge height resulting from the 19 May event reached 4-10 m, particularly around the S part of the island. Rockfalls continued to produce plumes that could be seen from a distance.

Source: Rabaul Volcano Observatory (RVO)



Ongoing Activity


Volcano index photo  Aira  | Kyushu (Japan)  | 31.593°N, 130.657°E  | Elevation 1117 m

Based on information from JMA and a pilot report, the Tokyo VAAC reported that ash plumes from Sakura-jima rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. during 23-24 and 26-28 May. Plumes drifted E and SE and rose straight up.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Bagana  | Bougainville (Papua New Guinea)  | 6.137°S, 155.196°E  | Elevation 1855 m

Based on satellite image observations and information from RVO, the Darwin VAAC reported that a diffuse ash-and-steam plume rose to an altitude of 3.7 km (12,000 ft) a.s.l. on 22 May and drifted W. Another diffuse plume was visible on satellite imagery to an altitude of 3 km (10,000 ft) a.s.l. on 28 May.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Fuego  | Guatemala  | 14.473°N, 90.88°W  | Elevation 3763 m

On 25 May, CONRED reported that the Alert Level for Fuego was lowered from Yellow to Green based on recent communication with nearby communities and monitoring by scientists at INSIVUMEH. During 28-29 May, INSIVUMEH reported that the lava flow on the S flank continued to advance and produce incandescent blocks that rolled W into the Taniluyá River valley. Low rumbling noises were heard during 26-27 May and occasionally accompanied pyroclastic explosions. Additional explosions produced plumes to an altitude of 4.1 km (13,500 ft) a.s.l. and expelled incandescent material about 100 m above the crater. Avalanches of blocks were observed on the S and SW flank. Gray plumes drifted S. Steam-and-gas plumes rose to an altitude of 4.6 km (15,100 ft) a.s.l.

Sources: Coordinadora Nacional para la Reducción de Desastres (CONRED), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)



Volcano index photo  Karymsky  | Eastern Kamchatka (Russia)  | 54.049°N, 159.443°E  | Elevation 1513 m

Seismic activity at Karymsky was slightly above background levels during 18-25 May. A possible ash plume rose to an altitude of 2 km (6,400 ft) a.s.l. on 18 May. The Level of Concern Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Kilauea  | Hawaiian Islands (USA)  | 19.421°N, 155.287°W  | Elevation 1222 m

During 23-29 May, lava from Kilauea flowed SE across a growing lava delta into the ocean at the Poupou entry. By 24 May, lava no longer entered the ocean at the Kamokuna entry. Incandescence was visible from several vents in the Pu'u 'O'o crater and from breakouts above and at the base of the Pulama pali fault scarp. The earthquake swarm that began on 12 May continued S and E of Halema'uma'u, in the upper E rift zone, and at scattered locations in the S flank.

On 24 May, HVO recorded a M 4.7 earthquake at 0913, located beneath the upper E rift zone, near Puhimau crater, at a depth of 2 km. A M 4.1 aftershock occurred 20 minutes later and was located 1.5 km farther down-rift, beneath Koko'olau crater. A M 3.9 aftershock occurred at 1051 and was located another 2.5 km down-rift at a depth of 1 km. Since 1998, a few earthquakes with magnitudes greater than 4.0 have occurred at shallow depths beneath the upper E rift zone.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Lascar  | Chile  | 23.37°S, 67.73°W  | Elevation 5592 m

Based on a Significant Meteorological Information (SIGMET) advisory and satellite image observations, the Buenos Aires VAAC reported that an ash plume from Lascar rose to an altitude of 9.1 km (30,000 ft) a.s.l. on 23 May and drifted SSE.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Manam  | Papua New Guinea  | 4.08°S, 145.037°E  | Elevation 1807 m

Based on satellite image observations and information from RVO, the Darwin VAAC reported that diffuse plumes from Manam rose to an altitude of 3 km (10,000 ft) a.s.l. on 23 May and drifted SW and W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Merapi  | Central Java (Indonesia)  | 7.54°S, 110.446°E  | Elevation 2910 m

According to a news article, "hot clouds" and incandescent material from Merapi traveled a distance of 1 km SE down the Gendol River on 23 May. People in the nearby village of Muntilan, about 16 km W, reported "hot clouds" and ashfall.

Source: Antara News



Volcano index photo  Reventador  | Ecuador  | 0.077°S, 77.656°W  | Elevation 3562 m

Based on information from IG, the Washington VAAC reported that an ash plume from Reventador rose to an altitude of 3.7 km (12,000 ft) a.s.l. on 18 May and drifted NW. Ash was not observed on satellite imagery.

Source: Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Sangay  | Ecuador  | 2.005°S, 78.341°W  | Elevation 5286 m

Based on pilot observations, the Washington VAAC reported that an ash plume from Sangay rose to an altitude of 7.3 km (24,000 ft) a.s.l. on 24 May.

Source: Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Semeru  | Eastern Java (Indonesia)  | 8.108°S, 112.922°E  | Elevation 3657 m

Based on a pilot report and information from CVGHM, the Darwin VAAC reported diffuse ash plumes from Semeru at an altitude of 4.6 (15,000 ft) a.s.l. on 25 May. The plumes drifted W. Ash was not detected on satellite imagery.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Sheveluch  | Central Kamchatka (Russia)  | 56.653°N, 161.36°E  | Elevation 3283 m

KVERT reported that seismic activity at Shiveluch continued above background levels during 18-25 May. Based on seismic interpretation, ash plumes possibly rose to altitudes of 4-8 km (13,100-26,200 ft) a.s.l. throughout the reporting period. Plumes were visible on satellite imagery drifting N, NE, and NW during 17-19 May. A large thermal anomaly was also visible on satellite imagery. The Level of Concern Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Soufriere Hills  | Montserrat  | 16.72°N, 62.18°W  | Elevation 915 m

Based on visual observations, MVO reported that during 18-25 May lava-dome growth at Soufrière Hills likely ceased and the overall structure of the dome changed very little. Seismic activity was very low. The Alert Level remained at 4 (on a scale of 0-5).

Source: Montserrat Volcano Observatory (MVO)



Volcano index photo  St. Helens  | United States  | 46.2°N, 122.18°W  | Elevation 2549 m

Data from deformation-monitoring instruments indicated that during 23-29 May lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. In some instances, clouds inhibited visual observations.

Source: US Geological Survey Cascades Volcano Observatory (CVO)



Volcano index photo  Tungurahua  | Ecuador  | 1.467°S, 78.442°W  | Elevation 5023 m

IG reported that during 23-29 May, steam and steam-and-ash plumes intermittently visible from Tungurahua rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. and drifted NW and W. Ashfall was reported from areas SW on 25 May, W and SW on 26 and 29 May, and NW on 27 May.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)



Volcano index photo  Ubinas  | Peru  | 16.355°S, 70.903°W  | Elevation 5672 m

Based on pilot reports, observations from satellite imagery, and Significant Meteorological Information (SIGMET) advisories, the Buenos Aires VAAC reported that during 22-28 May ash plumes from Ubinas rose to altitudes of 5.5-7.3 km (18,000-24,000 ft) a.s.l. Plumes drifted NE, E, and ESE.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)



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 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

Criteria

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.


Disclaimers

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.

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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.

 Acronyms and Abbreviations

a.s.l. - above sea level

AVO - Alaska Volcano Observatory

AVHRR - Advanced Very High Resolution Radiometer

CENAPRED - Centro Nacionale de Prevencion de Desastres (México)

CONRED - Coordinadora Nacional para la Reducción de Desastres

COSPEC - Correlation Spectrometer

CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation

CVO - Cascades Volcano Observatory (USGS)

GMS - Geostationary Meteorological Satellite

GOES - Geostationary Operational Environmental Satellite

GVO - Goma Volcano Observatory

GVP - Global Volcanism Program (Smithsonian Institution)

HVO - Hawaiian Volcano Observatory (USGS)

ICE - Instituto Costarricense de Electricidad (Costa Rica)

IG - Instituto Geofísico (Ecuador)

IGNS - Institute of Geological and Nuclear Sciences (New Zealand) - now GNS Science

INETER - Instituto Nicaragüense de Estudios Territoriales (Nicaragua)

INGEMMET - Instituto Geológical Minero y Metalúrgico (Peru)

INGEOMINAS - Instituto Colombiano de Geología y Minería (Colombia)

INGV-CT - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (Italy)

INSIVUMEH - Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia (Guatemala)

IRD - Institut de Recherche pour le Développement (France)

JMA - Japanese Meteorological Agency

KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department

KVERT - Kamchatkan Volcanic Eruption Response Team

M - magnitude

METEOSAT - Meteorological Satellite

MEVO - Mount Erebus Volcano Observatory

MODIS - Moderate Resolution Imaging Spectroradiometer

MVO - Montserrat Volcano Observatory

MWO - Meteorological Watch Office

NEIC - National Earthquake Information Center

NIED - National Research Institute for Earth Science and Disaster Prevention (Japan)

NOAA - National Oceanic and Atmospheric Administration

NOTAM - Notice to Airmen

OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)

OFDA - Office of US Foreign Disaster Assistance

ONEMI - Oficina Nacional de Emergencia - Ministerio del Interior (Chile)

OVPDLF - Observatoire Volcanologique du Piton de la Fournaise (France)

OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)

PHIVOLCS - Philippine Institute of Volcanology and Seismology (Philippines)

RSAM - Real-time Seismic Amplitude Measurement

RVO - Rabaul Volcano Observatory

SERNAGEOMIN - Servicio Nacional de Geologia y Mineria (Chile)

SIGMET - Significant Meteorological Information

SNET - Servicio Nacional de Estudios Territoriales (El Salvador)

SVERT - Sakhalin Volcanic Eruption Response Team (Russia)

USAID - US Agency for International Development

USGS - United States Geological Survey

UTC - Coordinated Universal Time

VAAC - Volcanic Ash Advisory Center

VAFTAD - Volcanic Ash Forecast Transport And Dispersion

VDAP - Volcano Disaster Assistance Program (USGS)

VHP - Volcano Hazards Program (USGS)

VRC - Volcano Research Center (Japan)