All times are local unless otherwise stated.

Ciremai (Indonesia) | 15 October-21 October 2003 | New Activity / Unrest Cite this Report
Ciremai Sunda Volcanic Arc	According to news reports, local authorities issued an alert and closed Cereme to the public after detecting unrest. Several earthquakes were recorded on 17 October. Seismicity increased on 18 October, when 18 earthquakes up to M 2 occurred. Seismicity was felt in seven subdistricts of the Cilimus and Pesawahan districts. Sources: The Jakarta Post, Agence France-Presse (AFP), The Jakarta Post, ABC News - Australian Broadcasting Corporation
Mayon (Philippines) | 15 October-21 October 2003 | New Activity / Unrest Cite this Report
Mayon Eastern Philippine Volcanic Arc	According to news reports, the continuing unrest at Mayon led authorities to extend the 6-km-radius Permanent Danger Zone to 7 km in the SE quadrant of the volcano on 13 October. Seismicity and SO2 emissions increased during the previous week. During a 24-hour-monitoring period, ending the night of 17 October, 16 volcanic earthquakes were recorded beneath Mayon's lower flanks. Authorities maintained Alert Level 2 (on a scale of 0-5). Source: Manila Bulletin

Colima (Mexico) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Belt	Based on information from the Mexico City MWO, the Washington VAAC reported that on 16 October at 1202 ash was emitted from Colima and rose to a height of ~6 km a.s.l. On 18 October an ash plume rose to ~7.3 km a.s.l. Neither plume was visible on satellite imagery. Source: Washington Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Satellite imagery showed an ash plume emitted from Dukono on 15 October at 1228. The plume rose to ~3 km a.s.l. and extended ~75 km NNE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Fuego (Guatemala) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Fuego Central America Volcanic Arc	A 33-minute-long explosive eruption began at Fuego on 17 October at 0007, producing a gas-and-ash plume to ~1.5 km above the crater. This eruption was preceded and followed by small explosions and seismicity. During one of these earthquakes a small incandescent avalanche descended the Santa Teresa ravine. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kilauea (United States) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 15-20 October, a few areas of surface lava were visible upslope of Kilauea's coastal flat. Seismicity at Kilauea's summit continued at moderate levels, with one to two small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera. There were some larger earthquakes at depths of a few kilometers. Also, during the report week small amounts of inflation and deflation occurred. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	Seismicity was above background levels at Kliuchevskoi during 11-17 October, with one to six magnitude 1.6-2.1 earthquakes per day at depths of ~30 km. Nine shallow M 1.7-2.2 earthquakes were recorded along with many smaller ones. On 9, 10, and 11 October, gas-and-steam plumes with little ash rose to 0.5-1.5 km above the volcano's crater and extended more than 10 km E. Similar plumes on 12 and 16 October extended more than 46 km and 50 km to the E and NE, respectively. Strombolian activity was observed on the night of 10-11 October. Kliuchevskoi remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Reventador (Ecuador) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Reventador Andean Northern Volcanic Arc	During 13-19 October at Reventador, 77 volcano-tectonic and 17 long-period earthquakes were recorded, averaging eleven and two earthquakes per day, respectively. Lahars were reported on 13, 14, and 19 October. The lahar on 13 October was the largest of the week, lasting ~75 minutes. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Santa Maria (Guatemala) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Santa Maria Central America Volcanic Arc	As of 17 October Santa María's Santiaguito lava dome produced moderate explosions accompanied by block-and-ash flows that traveled SSW and NE. On 16 October at 1745 a strong explosion caused a portion of the SW crater to collapse, forming a pyroclastic flow that traveled ~4 km in ~3 minutes. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Soufriere Hills (United Kingdom) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Soufriere Hills Lesser Antilles Volcanic Arc	Activity at Soufrière Hills during 10-17 October remained at low levels. Seismicity indicated that 12 rockfalls occurred as well as nine hybrid earthquakes. Lahars were also noted during periods of heavy rainfall. Sulfur-dioxide emissions increased from 600-900 tons per day at the beginning of the week to a peak of 1,900 tons on 13 October, and descended to 720 tons on 16 October. Low-level ash plumes were occasionally seen on satellite imagery. Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
Tungurahua (Ecuador) | 15 October-21 October 2003 | Continuing ActivityCite this Report
Tungurahua Andean Northern Volcanic Arc	During 15-19 October activity at Tungurahua remained high, with moderate-to-slight gas-and-ash emissions sending columns on average to 1.5 km above the crater. On the night of 18 October incandescent blocks were observed rolling down the W side of the crater. Incandescence and Strombolian activity were observed on the night of 19 October. Activity decreased slightly on 20 October with fewer explosions and no major gas-and-ash eruptions recorded. Ash plumes were frequently visible on satellite imagery during the week. Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,444 individual reports over 1,235 weeks (average of 17 per week) on 336 different volcanoes.

Use the dropdowns to choose the year and week for archived Weekly Reports.

 News Feeds and Google Placemarks

 Criteria & Disclaimers

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.

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 cover longer time periods and are 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

 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)