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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 25 April-1 May 2007.


















 Activity for the week of 25 April-1 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
Bezymianny Central Kamchatka (Russia) New
Lopevi Vanuatu New
Piton de la Fournaise Reunion Island (France) New

Ambrym Vanuatu Ongoing
Batu Tara Komba Island (Indonesia) Ongoing
Chikurachki Paramushir Island (Russia) Ongoing
Colima Mexico Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Klyuchevskoy Central Kamchatka (Russia) Ongoing
Manam Papua New Guinea Ongoing
Masaya Nicaragua Ongoing
Rabaul New Britain (Papua New Guinea) Ongoing
Reventador Ecuador Ongoing
Santa Maria Guatemala Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
St. Helens United States Ongoing
Talang Indonesia Ongoing
Tungurahua Ecuador Ongoing
Ubinas Peru Ongoing
Ulawun New Britain (Papua New Guinea) Ongoing


New Activity / Unrest


Volcano index photo  Bezymianny  | Central Kamchatka (Russia)  | 55.972°N, 160.595°E  | Elevation 2882 m

Based on [a pilot report to the] Petropavlovsk-Kamchatsky Flight Information Region (FIR) [at 0725], the Tokyo VAAC reported that on 29 April an ash plume from Bezymianny rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted W. [Ash was not seen in MTSAT-IR satellite data about 26 minutes prior to the pilot report.]

[Later information regarding this reported event provided by KVERT noted that no satellite data reviewed by volcanologists contained ash plumes, there were no strong seismic events, and no explosions were seen on the video camera. Meteorological clouds were present at 4.5-5.0 km altitude overnight and through 0900 local time. No ash fell in the village of Kozyrevsk, which would have been expected had an ash plume drifted W.]

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



Volcano index photo  Lopevi  | Vanuatu  | 16.507°S, 168.346°E  | Elevation 1413 m

Based on a pilot report, the Wellington VAAC reported that an ash plume from Lopevi covered the vent on 25 April. The altitude of the plume was not reported.

Source: Wellington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Piton de la Fournaise  | Reunion Island (France)  | 21.244°S, 55.708°E  | Elevation 2632 m

OVPDLF reported that the eruption of Piton de la Fournaise continued during 25-30 April. Lava flows on the Brûlé set fire to vegetation on 25 April. Tremor remained very low in intensity.

Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)



Ongoing Activity


Volcano index photo  Ambrym  | Vanuatu  | 16.25°S, 168.12°E  | Elevation 1334 m

The Wellington VAAC reported that an ash plume from Ambrym was visible on satellite imagery on 1 May. The altitude and direction of the plume were not reported.

Source: Wellington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Batu Tara  | Komba Island (Indonesia)  | 7.791°S, 123.585°E  | Elevation 633 m

Based on a pilot report, the Darwin VAAC reported that on 27 April a plume from Batu Tara rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted W.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Chikurachki  | Paramushir Island (Russia)  | 50.324°N, 155.461°E  | Elevation 1781 m

KVERT reported that no eruptive activity from Chikurachki was noted visually or on satellite imagery during 20-27 April. The Level of Concern Color Code was lowered to yellow.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Colima  | Mexico  | 19.514°N, 103.62°W  | Elevation 3850 m

Based on satellite imagery, the Washington VAAC reported that ash plumes from Colima drifted NW on 26 April. On 28 and 30 April, incandescent material was ejected 100 m above the summit.

Sources: Gobierno del Estado de Colima, Washington Volcanic Ash Advisory Center (VAAC)



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

Seismic activity at Karymsky was above background levels during 20-27 April. Based on seismic interpretation, satellite imagery, and visual observation, ash plumes rose to altitudes of 4-4.5 km (13,100-14,800 ft) a.s.l. on 21 April and drifted SE. 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 25 April-1 May, lava from Kilauea continued to flow SE across a lava delta into the ocean at the Kamokuna entry, but lava was not seen entering the ocean at East Lae'apuki. Incandescence was visible from several vents in the Pu'u 'O'o crater and minimally visible from breakouts on the Pulama pali. On 28 April, a gas plume rose from an unidentified location above the pali. Earthquake activity was scattered at the summit, upper E rift zone, and S-flank areas. Tremor remained at moderate levels.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



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

During 20-27 April, KVERT reported that Strombolian activity occurred at Kliuchevskoi, based on observations and video data. Seismic activity continued above background levels and a thermal anomaly in the crater was detected on satellite imagery. Mudflows and lava flows continued to advance on the NW flank. Phreatic activity and ash plumes from lava-flow fronts were noted. Gas-and-steam plumes containing ash rose to altitudes of 7.2 km (23,600 ft) a.s.l. and were visible on satellite imagery drifting E and SE. Based on satellite imagery and information from KVERT, the Tokyo VAAC reported that ash plumes rose to an altitude of 5.2 (17,000 ft) a.s.l. and drifted E during 25-26 April. The Level of Concern Color Code remained at Orange.

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



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

Based on satellite imagery and information from Rabaul Volcano Observatory, the Darwin VAAC reported diffuse plumes from Manam during 25-26 April.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Masaya  | Nicaragua  | 11.984°N, 86.161°W  | Elevation 635 m

The Washington VAAC reported a steam plume from Masaya, visible on satellite imagery and a web camera, drifted WSW on 26 April.

Source: Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Rabaul  | New Britain (Papua New Guinea)  | 4.271°S, 152.203°E  | Elevation 688 m

Based on information from RVO, the Darwin VAAC reported that explosions occasionally occurred from Rabaul on 26 April. Diffuse steam-and-ash plumes were visible on satellite imagery and rose to a few hundred meters. RVO reported that on 29 April, ash plumes rose to 2.7 km (8,900 ft) a.s.l. and drifted W. Ashfall was reported from areas downwind and occasional roaring noises were heard. Incandescence was observed at night during 25-29 April.

Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Rabaul Volcano Observatory (RVO)



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

On 27 April, a steam plume from Reventador rose to an altitude of 3.7 km (12,000 ft) a.s.l. Later that night, incandescent material was ejected from the crater. On 30 April, a steam plume was observed on satellite imagery drifting NW. Based on the Guayaquil MWO and satellite imagery, the Washington VAAC reported that an ash plume rose to an altitude of 3.7 km (12,000 ft) and drifted NW. Visual observations were hindered during 25 April-1 May due to inclement weather.

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Santa Maria  | Guatemala  | 14.757°N, 91.552°W  | Elevation 3745 m

INSIVUMEH reported that explosions from Santa María's Santiaguito lava dome complex on 26 April produced ash plumes that rose to altitudes of 4.4-4.8 km (14,400-15,700 ft) a.s.l. and drifted SW. Based on satellite imagery, the Washington VAAC reported that ash plumes and steam-and-ash plumes drifted S and WSW on 26 and 28 April, respectively. On 30 April, INSIVUMEH reported that explosions caused ashfall to the SW. Lava extrusion was low.

Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (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 20-27 April. Based on seismic interpretation, observation, and video data, ash-and-steam plumes possibly rose to altitudes of 6.5-9 km (21,300-30,000 ft) a.s.l. throughout the reporting period. Plumes were seen on satellite imagery drifting E and SE, and a thermal anomaly was present. Hot avalanches originated from the dome. The Level of Concern Color Code remained at Orange.

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



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

During 25 April-1 May, lava-dome growth at Soufrière Hills continued at a reduced rate. Rockfalls and pyroclastic flows occasionally occurred. On 30 April, two pyroclastic flows were observed to the NE in Tuitt's Ghaut.

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 and observations from a remote camera showed that during 25 April-1 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. On 27 April, a thermal plume was detected on satellite imagery.

Source: US Geological Survey Cascades Volcano Observatory (CVO)



Volcano index photo  Talang  | Indonesia  | 0.979°S, 100.681°E  | Elevation 2575 m

CVGHM lowered the Alert Level at Talang to 2 (on a scale of 1-4) on 27 April.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)



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

IG reported that during 25, 27-29 April, and 1 May, ash plumes from Tungurahua rose to altitudes of 5.8-7.5 km (19,000-24,600 ft) a.s.l. and drifted SW and W. Ashfall was reported in areas to the SW, W, and NW during 25, 29-30 April, and 1 May. On 25 April, muddy water flowed down river valleys to the NW and disrupted the road between Ambato and Baños. The next day, lahars traveled down almost all of the river valleys, but were most concentrated in valleys to the W. Lahars and muddy water flowed down NW and W river valleys on 27 and 30 April.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)



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

Based on satellite imagery and pilot reports, the Buenos Aires VAAC reported that ash plumes from Ubinas rose to altitudes of 5.5-7 km (18,000-23,000 ft) a.s.l. on 26, 29, and 30 April, and 1 May. Plumes drifted E and SS

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Ulawun  | New Britain (Papua New Guinea)  | 5.05°S, 151.33°E  | Elevation 2334 m

Based on satellite imagery and information from the Rabaul Volcano Observatory, the Darwin VAAC reported that diffuse plumes from Ulawun drifted N on 28 April. On 1 May, an ash plume rose to an altitude of 4 km (13,000 ft) a.s.l. and drifted W.

Source: Darwin Volcanic Ash Advisory Centre (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)