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Smithsonian / USGS Weekly Volcanic Activity Report

You are currently viewing Archived reports for the week of 1 August-7 August 2001.


















 Activity for the week of 1 August-7 August 2001

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
Etna Sicily (Italy) New
Mayon Luzon (Philippines) New
Sheveluch Central Kamchatka (Russia) New

Kilauea Hawaiian Islands (USA) Ongoing
Popocatepetl Mexico Ongoing
Soufriere Hills Montserrat Ongoing
Tungurahua Ecuador Ongoing


New Activity / Unrest


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

The level of Concern Color Code was raised from Yellow to Red (the highest level) on 7 August after a relatively large eruption occurred that day. Prior to the eruption, during 28 July-3 August, seismic activity was at background levels; weak, long local seismic events (possible collapses and/or avalanches) were recorded, and weak fumarolic activity was observed. On 6 August AVHRR imagery showed a three-pixel thermal anomaly on the volcano. On 7 August at 1128 an ash cloud was observed from the town of Klyuchi rising 5 km above the volcano and drifting to the ESE. By 1215 the ash cloud was at a maximum height of 10 km.

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



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

News articles stated that around 1 August lava stopped advancing towards the Rifugio Sapienza tourist area, although lava in other parts of the volcano slowly continued to advance. According to the Toulouse VAAC, narrow ash clouds that rose to below 5.5 km a.s.l. were occasionally visible in satellite imagery and on Sistema Poseidon's web cam. The international Fontanarossa airport in Catania was closed, for the fourth time since the eruptive period began, during 2-5 August due to ash clouds in the area. The amount of ash emitted from the volcano decreased on 5 August and only steam with small amounts of ash located close to the ground was visible on the web cam.

Sources: Sezione di Catania - Osservatorio Etneo (INGV), Toulouse Volcanic Ash Advisory Centre (VAAC), Etna Volcan Sicilien (Charles Rivière), Associated Press



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

Volcanic activity during 1-4 August at Mayon consisted of high SO2 emission, high- and low-frequency harmonic tremor and low-frequency volcanic earthquakes, slight inflation of the edifice, and the ejection of lava fragments up to 100 m above the crater rim. PHIVOLCS stated that activity had decreased since the 26 July eruptions and the volcano was in a mild state of eruption. According to news reports, approximately 26,500 people were still evacuated from their homes near the volcano. Mayon remained at Alert level 5, the highest level.

Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Manila Bulletin, Associated Press



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

During the week seismic activity remained above background levels, with many small earthquakes occurring within the volcano's edifice and several different seismic signals (explosion, avalanche, collapse) recorded locally. The level of continuous spasmodic volcanic tremor increased on 28 July and again on 30 July. Gas-and-steam plumes were observed rising to a maximum height of 1 km above the dome and on the night of 1 August ash fell in the town of Klyuchi, 46 km from the volcano. One- to three-pixel thermal anomalies were occasionally visible in satellite imagery. The volcano remained at Concern Color Code Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Ongoing Activity


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

Moderate amounts of lava continued to flow into the sea at the E Kupapa`u entry. Surface lava flows were occasionally visible to the E and W of the current lava flow field. Pahoehoe lava was visible slowly spreading on the coastal flat seaward of the base of the Pulama pali scarp. Generally, weak, rather steady tremor and a few small earthquakes continued beneath Kilauea's caldera. Near Pu`u `O`o, continuous tremor occurred at weak-to-moderate levels. Elsewhere, seismicity was at normal levels. Tiltmeters across the volcano showed no significant deformation.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Popocatepetl  | Mexico  | 19.023°N, 98.622°W  | Elevation 5393 m

Low-level volcanic activity occurred at Popocatépetl during the week. Several small emissions occurred at the volcano that were mainly composed of steam, gas, and small amounts of ash.

Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)



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

Volcanic activity rapidly declined after the lava dome at Soufrière Hills partially collapsed on 29 July. Observation flights after the collapse revealed that the general summit region had been lowered by about 150 m. There was also a complex amphitheater-shaped scar several hundred meters deep incised into the core of the dome at the head of the Tar River Valley. A new dome was growing within the scar. The Washington VAAC reported that a minor eruption occurred on 4 August at 0300. The eruption produced ash that traveled in two different directions; the first ash cloud rose to ~4.6 km a.s.l. and drifted NW; the second cloud rose to ~9.7 km a.s.l. and drifted NE.

Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC), Associated Press, Reuters



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

IG reported that during 2 August until at least 3 August there was an increase in volcanic activity at Tungurahua. Continuous tremor began on 3 August at 1400 that may have been associated with continuous ash emission. In addition, the Washington VAAC reported that several eruptions occurred during the week, with the largest eruption on 5 August at 1700 producing an ash cloud that rose to ~12.5 km a.s.l.

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



Weekly Reports Archive

Search by Volcano
Agung Fourpeaked Lewotobi Sakar
Ahyi Fuego Lewotolo Salak
Aira Fujisan Little Sitkin San Cristobal
Akan Fukutoku-Oka-no-Ba Llaima San Miguel
Alaid Galeras Loihi San Vicente
Alu-Dalafilla Galunggung Lokon-Empung Sangay
Ambae Gamalama Lopevi Sangeang Api
Ambang Gamkonora Machin Santa Ana
Ambrym Gaua Makian Santa Maria
Anatahan Gorely Makushin Sarigan
Antillanca Volcanic Complex Great Sitkin Maly Semyachik Sarychev Peak
Antuco Grimsvotn Manam Saunders
Apoyeque Guagua Pichincha Manda Hararo Semeru
Arenal Guallatiri Marapi Semisopochnoi
Asamayama Guntur Maroa Seulawah Agam
Askja Hachijojima Martin Sheveluch
Asosan Hakoneyama Masaya Shishaldin
Augustine Heard Mauna Loa Simbo
Avachinsky Hekla Mayon Sinabung
Awu Hierro McDonald Islands Sinarka
Axial Seamount Hokkaido-Komagatake Melimoyu Siple
Azul, Cerro Home Reef Merapi Sirung
Azumayama Hood Midagahara Slamet
Bagana Huaynaputina Misti, El Soputan
Balbi Hudson, Cerro Miyakejima Sorikmarapi
Bamus Huila, Nevado del Momotombo Sotara
Banda Api Hunga Tonga-Hunga Ha'apai Monowai Soufriere Hills
Bardarbunga Ibu Montagu Island Soufriere St. Vincent
Barren Island Ijen Moyorodake [Medvezhia] South Sarigan Seamount
Batur Iliamna Mutnovsky Spurr
Bezymianny Iliwerung Myojinsho St. Helens
Bogoslof Inielika Nabro Stromboli
Brava Ioto Negra, Sierra Sulu Range
Bristol Island Iya Negro, Cerro Sumbing
Bulusan Izu-Torishima Nightingale Island Sundoro
Calbuco Jackson Segment Nishinoshima Suretamatai
Callaqui Kaba Nisyros Suwanosejima
Cameroon Kadovar Novarupta Taal
Campi Flegrei del Mar di Sicilia Kambalny NW Rota-1 Tair, Jebel at
Cayambe Kanaga Nyamuragira Takawangha
Cereme Kanlaon Nyiragongo Talang
Chachadake [Tiatia] Karangetang Okataina Tambora
Chaiten Karkar Okmok Tanaga
Chiginagak Karthala Ontakesan Tandikat-Singgalang
Chikurachki Karymsky Oraefajokull Tangkoko-Duasudara
Chiles-Cerro Negro Kasatochi Osorno Tangkuban Parahu
Chillan, Nevados de Katla Pacaya Tara, Batu
Chirinkotan Kavachi Pagan Telica
Chirpoi Kelimutu Paluweh Tenerife
Cleveland Kelut Panarea Tengger Caldera
Colima Kerinci Papandayan Three Sisters
Colo Ketoi Parker Tinakula
Concepcion Kharimkotan Pavlof Tofua
Copahue Kick 'em Jenny Peuet Sague Tokachidake
Cotopaxi Kikai Pinatubo Tolbachik
Cuicocha Kilauea Planchon-Peteroa Toliman
Cumbal Kirishimayama Poas Tongariro
Dabbahu Kizimen Popocatepetl Tungurahua
Dempo Klyuchevskoy Puyehue-Cordon Caulle Turrialba
Descabezado Grande Kolokol Group Rabaul Ubinas
Dieng Volcanic Complex Korovin Raikoke Ulawun
Dukono Koryaksky Ranakah Unknown Source
Ebeko Krakatau Raoul Island Unnamed
Ebulobo Krummel-Garbuna-Welcker Rasshua Unnamed
Egon Kuchinoerabujima Raung Veniaminof
Ekarma Kurikomayama Redoubt Villarrica
Epi Kusatsu-Shiranesan Reventador West Mata
Erebus Kverkfjoll Reykjanes Whakaari/White Island
Erta Ale Lamington Rincon de la Vieja Witori
Etna Lamongan Rinjani Wolf
Etorofu-Yakeyama [Grozny Group] Langila Ritter Island Yasur
Eyjafjallajokull Lanin Rotorua Zaozan [Zaosan]
Fernandina Lascar Ruang Zavodovski
Fogo Lateiki Ruapehu Zhupanovsky
Fonualei Lengai, Ol Doinyo Ruiz, Nevado del Zubair Group
Fournaise, Piton de la Leroboleng Sabancaya
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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.

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.)

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URL https://volcano.si.edu/reports_weekly.cfm
Contact: USGS Web Team
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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)