Logo link to homepage

Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 7 August-13 August 2002.


















 Activity for the week of 7 August-13 August 2002

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
Izu-Torishima Japan New
Ol Doinyo Lengai Tanzania New
Pinatubo Luzon (Philippines) New
Sheveluch Central Kamchatka (Russia) New
Witori New Britain (Papua New Guinea) New

Etna Sicily (Italy) Ongoing
Kerinci Indonesia Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Raung Eastern Java (Indonesia) Ongoing
Soufriere Hills Montserrat Ongoing
Tungurahua Ecuador Ongoing


New Activity / Unrest


Volcano index photo  Izu-Torishima  | Japan  | 30.484°N, 140.303°E  | Elevation 394 m

On 11 August around 1530 a ship sailing near Tori-shima reported to the Japan Coast Guard that they observed white smoke rising from the summit of the volcano. JMA reported that an aerial inspection the following day during 1145-1245 revealed an ash-laden plume rising from the SW crater wall of the summit crater (Iwoyama) and white plumes emanating from the S to SE portion of the crater wall. Vigorous ash plumes rose 200-300 m above the crater every few minutes, drifted W, and ultimately reached a height of 1 km a.s.l. The summit area and the middle slope NNW of the summit were covered with ash-fall deposits. Discolored sea water extended 20 km W of the island. Tori-shima is not inhabited by humans, but an endangered albatross species lives there.

Sources: Associated Press, Japan Meteorological Agency (JMA) via the Volcano Research Center, Reuters, NOAA Marine Forecasts



Volcano index photo  Ol Doinyo Lengai  | Tanzania  | 2.764°S, 35.914°E  | Elevation 2962 m

During 4-9 August, Ol Doinyo Lengai was in a heightened state of volcanic activity. A group visiting the volcano for 5 days saw episodes of sudden explosive lava fountaining from cracks and fissures in the crater floor. Sulfurous gases were also unusually strong in the central crater. Around 0210, part of an expedition camp in the crater of Ol Doinyo Lengai was destroyed by extremely fluid pahoehoe lava flows. A local guide received several second-degree burns on one foot when material in his tent was ignited by the lava.

Source: Ol Doinyo Lengai (Fred Belton)



Volcano index photo  Pinatubo  | Luzon (Philippines)  | 15.13°N, 120.35°E  | Elevation 1486 m

On 10 July the western wall of Pinatubo's crater collapsed, gradually releasing about 160 million m3 of water and sediments. The collapse occurred at the crater wall's lowest point leading to the Maraunot River in Botolan, Zambales. About a year earlier workers had removed a section of the crater wall in an effort to gradually release the rapidly rising water in the crater and prevent a larger crater-wall collapse. PHIVOLCS reported to Philstar news that if the notch had not been created at least 320 million m3 of water and sediment could have been released into inhabited areas.

Source: Philstar News



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

During 2-9 August, seismicity remained above background levels at Shiveluch. More than ten M 1.8-2.5 earthquakes occurred and there were a number of smaller ones at depths of 0-6 km. Other local shallow seismic signals occurred, which possibly indicated ash-poor explosions (one to five per day to heights of 1.5-3 km above the dome). In addition, avalanches were registered and volcanic tremor decreased slightly. Ash-poor plumes rose to a maximum height of 3 km above the lava dome. Thermal anomalies were visible on satellite imagery, but ash was not. KVERT increased the Concern Color Code from Yellow ("volcano is restless") to Orange ("explosive eruption is possible within a few days and may occur with little or no warning").

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Witori  | New Britain (Papua New Guinea)  | 5.576°S, 150.516°E  | Elevation 724 m

The eruption at Pago that began the previous week continued through 13 August. According to news articles, 6,000-8,000 people had been evacuated from villages surrounding the volcano by 9 August. No injuries had been reported. The Rabaul Volcano Observatory (RVO) reported that the eruption was characterized by the ejection of light gray to some dark ash clouds. The clouds drifted primarily to the N and NW, after reaching heights of a few kilometers above the summit. Very little ash was deposited in areas surrounding the volcano. The thickest ashfall (3 mm) occurred at Rikau and Matmada, 6-8 km NNW of the volcano. There was not more than 1 mm of ash deposited at Hoskins airport. Aerial inspection of the summit area by RVO staff indicated that there were no lava flows descending the volcano's flanks, instead, lava extruded onto the surface formed cones above the active vents. The highest cone was about 60 m tall. Contrary to previous reports, there was no bulging on the N or NW sides of the volcano. During the week, seismicity was at low-to-moderate levels. The closure of the airport near the town of Kimbe, 30 miles N of Pago, disrupted island air traffic. On 13 August at 1030 a thin plume was visible on satellite imagery reaching a height of about 2.1 km and extending N to NW. The summit was covered by meteorological clouds, preventing visual observations. Only weak intermittent rumbling was heard. RVO advised that activity had settled into a steady pattern, although changes in the nature of the eruption could occur.

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



Ongoing Activity


Volcano index photo  Etna  | Sicily (Italy)  | 37.748°N, 14.999°E  | Elevation 3295 m

The Toulouse VAAC reported that beginning on 9 August at 0630 ash was visible at Etna on a web cam. The ash was around summit level and was not visible on satellite imagery. According to the Etna Volcan Sicilian website, during a visit to the summit on 8 August brown ash was emitted from Bocca Nuova crater. By the 9th only gas was released from Bocca Nuova.

Sources: Etna Volcan Sicilien (Charles Rivière), Toulouse Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Kerinci  | Indonesia  | 1.697°S, 101.264°E  | Elevation 3800 m

The Darwin VAAC reported that on 13 August around 0925 an ash plume from Kerinci rose to ~7.3 km a.s.l. Ash was not visible on satellite imagery.

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



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

During 7-13 August, surface lava flows continued to travel down Kilauea's flank into the sea at the Wilipe`a entry and on 7 August at 1427 the W Highcastle lobe reached the sea. On the evening of the 7th several littoral explosions occurred on the E side of the most seaward tip of the lava bench, spraying spatter and solid rocks back onto the bench. No visitors were in the prohibited area. A lava bench began to grow near the W Highcastle flow 10 m from the shoreline and was 30 m long parallel to the sea cliff by 11 August. Surface lava flows also cascaded down Paliuli at times. Generally, seismicity was at normal levels, except for the continued swarm of long-period earthquakes and tremor that has been taking place since early June. There were no signs of significant deformation at the volcano.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Raung  | Eastern Java (Indonesia)  | 8.119°S, 114.056°E  | Elevation 3260 m

The Darwin VAAC received reports stating that on 12 August at 1720 ash was visible drifting NW of Raung around summit level. The summit was partially obscured by meteorological clouds and no ash was identifiable on satellite imagery.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



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

During 2-9 August, activity at Soufrière Hills continued at a high level. Lava-dome growth remained focussed on the N side of the dome complex, with the development of a massive curved lobe of lava. During the early part of the week, the lobe repeatedly crumbled, producing rockfalls and small pyroclastic flows that reached the upper portion of Tuitt's Ghaut. Limited activity occurred on the NW part of the dome, although one small pyroclastic flow occurred in the notch between the central and north-western buttresses. Over the last 3 days of the report period, rockfall activity decreased substantially. This was due to the lobe becoming more coherent and not collapsing, not due to the activity stagnating. During the report week SO2 mass flux increased.

Source: Montserrat Volcano Observatory (MVO)



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

During 7-13 August, emissions of steam, gas, and ash continued at Tungurahua. Ash was seen rising to a maximum height of ~6.7 km a.s.l., but it was not visible on satellite imagery.

Source: Washington Volcanic Ash Advisory Center (VAAC)



Weekly Reports Archive

Search by Volcano
Agung Fuego Llaima San Cristobal
Ahyi Fujisan Loihi San Miguel
Aira Fukutoku-Oka-no-Ba Lokon-Empung San Vicente
Akan Galeras Lopevi Sangay
Alaid Galunggung Machin Sangeang Api
Alu-Dalafilla Gamalama Makian Santa Ana
Ambae Gamkonora Makushin Santa Maria
Ambang Gaua Maly Semyachik Sarigan
Ambrym Gorely Manam Sarychev Peak
Anatahan Great Sitkin Manda Hararo Saunders
Antuco Grimsvotn Marapi Semeru
Apoyeque Guagua Pichincha Maroa Semisopochnoi
Arenal Guallatiri Martin Seulawah Agam
Asamayama Guntur Masaya Sheveluch
Askja Hachijojima Mauna Loa Shishaldin
Asosan Hakoneyama Mayon Simbo
Augustine Heard McDonald Islands Sinabung
Avachinsky Hekla Melimoyu Sinarka
Awu Hierro Merapi Siple
Axial Seamount Hokkaido-Komagatake Metis Shoal Sirung
Azul, Cerro Home Reef Midagahara Slamet
Azumayama Hood Misti, El Soputan
Bagana Hudson, Cerro Miyakejima Sorikmarapi
Balbi Huila, Nevado del Momotombo Sotara
Bamus Hunga Tonga-Hunga Ha'apai Monowai Soufriere Hills
Banda Api Ibu Montagu Island Soufriere St. Vincent
Bardarbunga Ijen Moyorodake [Medvezhia] South Sarigan Seamount
Barren Island Iliamna Mutnovsky Spurr
Batur Iliwerung Myojinsho St. Helens
Bezymianny Inielika Nabro Stromboli
Bogoslof Ioto Negra, Sierra Sulu Range
Brava Iya Negro, Cerro Sumbing
Bristol Island Izu-Torishima Nightingale Island Sundoro
Bulusan Jackson Segment Nishinoshima Suretamatai
Calbuco Kaba Nisyros Suwanosejima
Callaqui Kadovar Novarupta Taal
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
Dukono Krakatau Ranakah Unnamed
Ebeko Krummel-Garbuna-Welcker Raoul Island Veniaminof
Ebulobo Kuchinoerabujima Rasshua Villarrica
Egon Kurikomayama Raung West Mata
Ekarma Kusatsu-Shiranesan Redoubt White Island
Epi Kverkfjoll Reventador Witori
Erebus Lamington Rincon de la Vieja Wolf
Erta Ale Lamongan Rinjani Yasur
Etna Langila Ritter Island Zaozan
Etorofu-Yakeyama [Grozny Group] Lanin Rotorua Zavodovski
Eyjafjallajokull Lascar Ruang Zhupanovsky
Fernandina Lengai, Ol Doinyo Ruapehu Zubair Group
Fogo Leroboleng Ruiz, Nevado del
Fonualei Lewotobi Sabancaya
Fournaise, Piton de la Lewotolo Sakar
Fourpeaked Little Sitkin Salak
Search by Date
Use the dropdowns to choose the year and week for archived Weekly Reports.





 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.

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
URL https://volcano.si.edu/reports_weekly.cfm
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.

 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)