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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 14 May-20 May 2003.


















 Activity for the week of 14 May-20 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.

Name Location Activity
Anatahan Mariana Islands (USA) New
Klyuchevskoy Central Kamchatka (Russia) New

Chikurachki Paramushir Island (Russia) Ongoing
Colima Mexico Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Mauna Loa Hawaiian Islands (USA) Ongoing
Mayon Luzon (Philippines) Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing


New Activity / Unrest


Volcano index photo  Anatahan  | Mariana Islands (USA)  | 16.35°N, 145.67°E  | Elevation 790 m

The eruption at Anatahan that began on 10 May continued through 20 May with less intensity than when it began. The Washington VAAC reported that the ash cloud produced by the eruption drifted W and NW and was at a height of ~5 km a.s.l. on 14 May, and ~4 km a.s.l. on 15 May. As of the 20th, steam-and-ash emissions continued, with the resultant clouds remaining below 3 km and drifting primarily W. According to a news report, parts of the island of Anatahan have been covered by up to ~0.5 m of ash. News reports also stated that by 16 May ash had drifted over the Philippines, posing a threat to aviation in the vicinity.

Sources: Washington Volcanic Ash Advisory Center (VAAC), Inquirer.net, Saipan Tribune



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

Several explosions occurred at Kliuchevskoi during 9-16 May, and seismicity was above background levels. On 14 May KVERT raised the Concern Color Code to Orange from Yellow. An eruption on 14 May at 1120 produced the week's highest rising ash cloud (~8.5 km a.s.l.). During the report period, instruments recorded 26 to 59 earthquakes per day. They were greater than M 1.25 and at depths of ~30 km. A large number of weak shallow earthquakes and tremor also occurred.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Pravda News



Ongoing Activity


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

The eruption that began at Chikurachki on 18 April continued through 16 May. Satellite imagery showed several clouds, inferred to contain steam, gas, and ash. On 13 May ash deposits were seen on the volcano's ENE through SSE flanks, extending to the coast. Chikurachki remained at Concern Color Code Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

According to the Universidad de Colima, lava flows have not been seen at Colima since early March, contrary to reports of lava flows visible on 6 May. As of about 18 May activity at Colima consisted of about 25 small explosions per day, with some containing ash. Ash dispersal was limited to ~7 km from the summit.

Source: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima



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

Intermittent explosive activity continued at Karymsky during 9-16 May. Seismicity was above background levels on 10-16 May. Seismic data indicated that a total of 10 ash-and-gas explosions reached heights up to 1 km above the crater, and hot avalanches possibly occurred. Satellite data revealed a thermal anomaly and strips of ash deposits on the volcano's flanks. Karymsky remained at Concern Color Code 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 14-19 May, lava flows continued to travel down Kilauea's S flank. Surface lava flows were visible on the coastal flat and the Pulama Pali fault scarp. Lava trickled into the sea at the West Highcastle entry on the 14th and then ceased thereafter. Generally, seismicity was at normal to below normal levels, with a few earthquakes and no tremor at Kilauea's summit. There were several small periods of inflation and deflation at Kilauea's summit and Pu`u `O`o.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Mauna Loa  | Hawaiian Islands (USA)  | 19.475°N, 155.608°W  | Elevation 4170 m

HVO reported on 18 May that inflation may have resumed at Mauna Loa's summit during the week, after slackening off following an increase in mid-February. Seismicity, however, remained low. Inflation was noted where the GPS network first showed definite lengthening of the lines across the summit caldera in late April or May 2002, after nearly 10 years of slight deflation. HVO interpreted the lengthening, uplift, and tilting to indicate resumed swelling of the magma reservoir within the volcano.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Mayon  | Luzon (Philippines)  | 13.257°N, 123.685°E  | Elevation 2462 m

On 14 May at 1813 a small and brief explosion at Mayon's summit crater produced a small NW-drifting ash puff that rose less than 100 m above the crater. Two seismic stations recorded this as a small-amplitude event. PHIVOLCS stated that there had been a succession of minor emissions in the past few months and that ongoing unrest may lead to more vigorous activity. The Alert Level remained at 1 (on a scale of 0-5), but PHIVOLCS indicated it would consider increasing the Alert Level if the current pace of unrest is sustained.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)



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

During 9-16 May at Shiveluch seismicity was above background levels, and several small explosions occurred. Weak shallow earthquakes were recorded, and seismic data suggested that 6 ash-and-gas explosions reached heights of 1.5 km above the lava dome and hot avalanches possibly occurred. On 11 May seismic data indicated that two ash-and-gas explosions rose to 6 km a.s.l. and were possibly accompanied by hot avalanches. Video data revealed a series of ash explosions beginning on 14 May at 1550 that produced ash clouds to heights of 4.2 km a.s.l. The explosions were accompanied by several pyroclastic flows. Shiveluch remained at Concern Color Code Yellow.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

Activity at Soufrière Hills remained high during 9-16 May. The direction of lava-dome growth switched to the NE during the report period. Rockfalls and pyroclastic flows traveled NE along the N side of the Tar River Valley and occasionally occurred in White's Ghaut. On 12 and 13 May several flows were observed on the lava dome's N and NW flanks in the area of Farrell's Plain and in the upper portions of Tyre's Ghaut. Pulses of vigorous ash venting were observed. SO2 emission rates 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)



Weekly Reports Archive

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Calbuco Kaba Nisyros Suwanosejima
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Cameroon Kambalny NW Rota-1 Tair, Jebel at
Campi Flegrei del Mar di Sicilia Kanaga Nyamuragira Takawangha
Cayambe Kanlaon Nyiragongo Talang
Cereme Karangetang Okataina Tambora
Chachadake [Tiatia] Karkar Okmok Tanaga
Chaiten Karthala Ontakesan Tandikat-Singgalang
Chiginagak Karymsky Oraefajokull Tangkoko-Duasudara
Chikurachki Kasatochi Osorno Tangkubanparahu
Chiles-Cerro Negro Katla Pacaya Tara, Batu
Chillan, Nevados de Kavachi Pagan Telica
Chirinkotan Kelimutu Palena Volcanic Group Tenerife
Chirpoi Kelut Paluweh Tengger Caldera
Cleveland Kerinci Panarea Three Sisters
Colima Ketoi Papandayan Tinakula
Colo Kharimkotan Parker Tofua
Concepcion Kick 'em Jenny Pavlof Tokachidake
Copahue Kikai Peuet Sague Tolbachik
Cotopaxi Kilauea Pinatubo Toliman
Cuicocha Kirishimayama Planchon-Peteroa Tongariro
Cumbal Kizimen Poas Tungurahua
Dabbahu Klyuchevskoy Popocatepetl Turrialba
Dempo Kolokol Group Puyehue-Cordon Caulle Ubinas
Descabezado Grande Korovin Rabaul Ulawun
Dieng Volcanic Complex Koryaksky Raikoke Unknown Source
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Fogo Leroboleng Ruiz, Nevado del Zubair Group
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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)