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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 21 July-27 July 2010.


















 Activity for the week of 21 July-27 July 2010

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
Ebeko Paramushir Island (Russia) New
Gorely Southern Kamchatka (Russia) New
Kilauea Hawaiian Islands (USA) New
Miyakejima Japan New
Rabaul New Britain (Papua New Guinea) New

Aira Kyushu (Japan) Ongoing
Batu Tara Komba Island (Indonesia) Ongoing
Chaiten Chile Ongoing
Dukono Halmahera (Indonesia) Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Klyuchevskoy Central Kamchatka (Russia) Ongoing
Pacaya Guatemala Ongoing
Sangay Ecuador Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
Suwanosejima Ryukyu Islands (Japan) Ongoing
Tungurahua Ecuador Ongoing
Turrialba Costa Rica Ongoing
Ulawun New Britain (Papua New Guinea) Ongoing


New Activity / Unrest


Volcano index photo  Ebeko  | Paramushir Island (Russia)  | 50.686°N, 156.014°E  | Elevation 1103 m

On 23 July, KVERT reported that the Aviation Color Code level for Ebeko was lowered to Green. Visual observations and satellite data indicated no activity from the volcano during 16-23 July.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Gorely  | Southern Kamchatka (Russia)  | 52.559°N, 158.03°E  | Elevation 1799 m

KVERT reported that during 16-23 July seismic activity from Gorely was above background levels and volcanic tremor continued to be detected. Gas-and-steam activity was noted daily and many new small fumarolic vents were seen in the active crater. The temperature of a daily thermal anomaly detected over the volcano in satellite imagery gradually increased from 29 to 46 degrees Celsius during 17-21 July. The Aviation Color Code level remained at Yellow.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

During 21-27 July HVO reported that activity at Kilauea continued from the summit and the east rift zone. At the summit, the level of a lava-pool surface in the deep pit within the floor of Halema'uma'u crater remained mostly stable; glow from the vent was also visible at night. A plume from the vent mainly drifted SW.

At the east rift zone, lava flows that broke out of the TEB lava-tube system advanced E and NE along coastal highway 137 beginning on 17 July and expanded S, filling in the area between the highway and the N-facing scarp of the Hakuma horst. On 24 July, lava flowed N and by the next morning had destroyed a home in Kalapana Gardens. Advancing lava flowed over an area of the horst and on 25 July reached the ocean. On 26 July, lava caused small brush fires and methane explosions in a kipuka on the W edge of the Kalapana subdivision. By 1200 on 27 July, a second lava flow 500 m E of the ocean entry had advanced over the horst and was about 20 m from the ocean. At Pu'u 'O'o crater, intermittent incandescence from lava flows on the N crater floor was visible starting on 24 July.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Miyakejima  | Japan  | 34.094°N, 139.526°E  | Elevation 775 m

Based on information from JMA, the Tokyo VAAC reported that an eruption from Miyake-jima on 21 July produced a plume that rose to an altitude of 1.2 km (4,000 ft) a.s.l. and drifted E.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)



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

RVO reported an eruption from Rabaul caldera's Tavurvur cone on 23 July, after increased seismicity likely beneath Tavurvur cone was detected the previous day. The eruption was preceded by a few small hybrid earthquakes at 1034 followed by small low-frequency earthquakes and later continuous volcanic tremor. Diffuse white plumes were initially emitted at 1320, and then pink-gray fumes with low ash content were seen. A strong odor of hydrogen sulfide was noted, and a diffuse cloud rose 1 km and drifted NW. Billowing gray clouds a few hours later (at 1600) indicated a higher ash content and increased activity. They were also accompanied by roaring and rumbling noises. Discrete explosions commenced at 1730. Ashfall was reported in areas to the NW and NNW.

During 23-25 July seismicity was variable. Ash emissions and ashfall in areas to the NW continued. Visibility was poor in Rabaul town (3-5 km NW) due to re-suspended ash from moving vehicles. Ash emissions stopped at about 1430 on 25 July. Later that day and into 26 July only diffuse brown-tinted vapor plumes were emitted and seismicity was very low.

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, the Tokyo VAAC reported that during 21-27 July explosions from Sakura-jima produced plumes. Those plumes, along with ash plumes occasionally seen by pilots, rose to altitudes of 1.2-4.6 km (4,000-15,000 ft) a.s.l. Most plumes rose vertically while others drifted N and NW.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)



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

Based on analyses of satellite imagery, the Darwin VAAC reported that on 21 July an ash plume from Batu Tara drifted 55 km NW at an altitude of 1.5 km (5,000 ft) a.s.l.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Chaiten  | Chile  | 42.833°S, 72.646°W  | Elevation 1122 m

Based on analyses of satellite imagery, the Buenos Aires VAAC reported that an ash plume from Chaitén's lava-dome complex drifted 70 km SSE on 24 July. Meteorological cloud cover in subsequent images prevented further detection of the plume.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Dukono  | Halmahera (Indonesia)  | 1.693°N, 127.894°E  | Elevation 1229 m

Based on analyses of satellite imagery, the Darwin VAAC reported that on 24 July an ash plume from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted over 110 km W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



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

KVERT reported that during 16-23 July seismic activity from Karymsky was above background levels and suggested that possible ash plumes rose to an altitude of 3 km (9,800 ft) a.s.l. A daily thermal anomaly was detected in satellite imagery. Imagery also showed ash plumes that drifted 58 km SW on 19 July and 85 km SE on 21 July. The Aviation Color Code level remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

KVERT reported that during 16-23 July seismic activity from Kliuchevskoi was above background levels and Strombolian activity was seen. Gas-and-steam activity was noted with ash plumes periodically rising to an altitude of 6.3 km (20,700 ft) a.s.l. Effusive lava flows descended the SSW flank. Satellite imagery analysis showed a large daily thermal anomaly from the volcano and ash plumes that drifted about 55-160 km SW, SE, and NE. The Aviation Color Code level remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Pacaya  | Guatemala  | 14.382°N, 90.601°W  | Elevation 2569 m

INSIVUMEH reported that on 20 July Strombolian explosions from Pacaya's MacKenney cone ejected ash that fell in neighboring areas. During 20-21 July there were 90 explosions recorded by the seismic network. Based on information from INSIVUMEH, the Washington VAAC reported that on 22 July a plume rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted N. A weak thermal anomaly was seen in subsequent images. The next day, ash plumes drifted N at an altitude of 4.1 km (13,500 ft) a.s.l. and produced ashfall in areas within 10 km. On 25 July, INSIVUMEH noted that Strombolian explosions ejected tephra 100 m above the crater, and generated ash plumes that rose 300 m above the crater and drifted 10 km SW. Ejected blocks fell onto the flanks.

Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (VAAC)



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

Based on pilot observations and analyses of satellite imagery, the Washington VAAC reported that on 21 July an ash cloud from Sangay drifted W. During 22-23 July, diffuse plumes drifted 65-115 km W. Occasional thermal anomalies were detected by satellite imagery on 21 and 23 July.

Source: 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 during 16-23 July seismic activity from Shiveluch was above background levels, possibly indicating weak ash explosions from the lava dome. According to visual observations, gas-and-steam plumes rose daily to an altitude of 3.7 km (12,100 ft) a.s.l. and ash plumes rose to an altitude of 5.5 km (18,000 ft) a.s.l. on 20 and 21 July. Satellite imagery showed a large daily thermal anomaly over the lava dome and ash plumes that drifted 50 km NE on 21 July. The Aviation Color Code level 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

MVO reported that activity at Soufrière Hills was low during 16-23 July and inclement weather prevented clear observations of the lava dome. Heavy rains generated a few lahars in the Belham valley to the NW. The largest occurred on 20 July and lasted about 40 minutes. The Hazard Level remained at 3.

Source: Montserrat Volcano Observatory (MVO)



Volcano index photo  Suwanosejima  | Ryukyu Islands (Japan)  | 29.638°N, 129.714°E  | Elevation 796 m

Based on information from JMA, the Tokyo VAAC reported that explosions from Suwanose-jima produced plumes that rose to an altitude of 1.5 km (5,000 ft) a.s.l. on 23 July and to an altitude of 2.4 km (8,000 ft) a.s.l. on 26 July. Plumes drifted NW and W, respectively.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)



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

Observations of Tungurahua's summit area during 21-27 July were sometimes not possible due to inclement weather. Ash plumes seen during 21-23 July rose to altitudes of 6-9 km (19,700-29,500 ft) a.s.l. and drifted W and NW. Ashfall was reported in areas within 10 km NW, W, and SW during 22-24 July. Steam plumes were seen rising 200 m above the crater on 25 July and an explosion was heard on 26 July. On 27 July a series of explosions was detected by the seismic network. Roaring noises were followed by vibrating windows in areas to the N and NW. Slight ashfall was noted in areas to the SW and W, and as far as 23 km NW.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)



Volcano index photo  Turrialba  | Costa Rica  | 10.025°N, 83.767°W  | Elevation 3340 m

Based on web camera views of Turrialba, the Washington VAAC reported that on 24 July a plume of steam, gas, and ash drifted W. Over the next three hours the plume became more diffuse and steam-rich.

Source: Washington Volcanic Ash Advisory Center (VAAC)



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

RVO reported that diffuse gray plumes rose 200-500 m above Ulawun during 16-21 July. Volcanic tremors continued, but overall seismicity declined slightly. Real-time Seismic-Amplitude Measurement (RSAM) values remained at a moderate level.

Source: Rabaul Volcano Observatory (RVO)



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Dieng Volcanic Complex Koryaksky Raikoke Unknown Source
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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.

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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)