All times are local unless otherwise stated.

Colima (Mexico) | 18 May-24 May 2005 | New Activity / Unrest Cite this Report
Colima Trans-Mexican Volcanic Belt	The largest eruption at Colima since 1999 occurred on 23 May at 1910. The eruption produced a plume that rose to ~5.8 km above the volcano (~31,700 ft a.s.l.) and drifted W. Pyroclastic flows traveled 4-5 km, mainly down San Antonio (SSW) and Monte Grande (SSE) ravines. Ash plumes rising above the pyroclastic flow drifted E. Sources: Centro Universitario de Estudios Vulcanológicos (CUEV) - Universidad de Colima, Reuters, Washington Volcanic Ash Advisory Center (VAAC), Associated Press
Galeras (Colombia) | 18 May-24 May 2005 | New Activity / Unrest Cite this Report
Galeras Andean Northern Volcanic Arc	According to a news article, on 24 May the Colombian government ordered the evacuation of ~9,000 people living near Galeras due to an increase in volcanic activity. INGEOMINAS reported that during 16-23 May, small shallow earthquakes occurred beneath the volcano. There was an increase in earthquakes associated with fracturing within the volcano during the night of 21 May to the morning of 22 May. Gas emissions slightly decreased on 17 and 20 May in comparison to 29 April and 2 May, and slightly increased around 23 May. Deformation continued to be recorded at the volcano's summit. There were no ash emissions. Galeras remained at Alert Level 2 (probable eruption in terms of days or weeks) as it has since 19 April 2005. Sources: Servicio Geológico Colombiano (SGC), Reuters

Anatahan (United States) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Anatahan Mariana Volcanic Arc	During 18-20 May volcanic tremor beneath Anatahan increased, peaking on the 20th. Afterwards, the tremor steadily declined through 23 May. Satellite imagery showed that emitted ash propagated to a maximum height of 3 km (10,000 ft) a.s.l. Source: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program
Dukono (Indonesia) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Satellite data showed thin ash plumes from Dukono on 21 May. The height of the plumes was not reported. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Fuego (Guatemala) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Fuego Central America Volcanic Arc	During 17-20 May, lava flows continued to travel down Fuego's flanks, extending ~400 m W and ~500 m SW of the summit. Short avalanches originated from the lava-flow fronts. Also, explosions sent ash and incandescent volcanic material to low altitudes. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kanlaon (Philippines) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Kanlaon Negros-Sulu Volcanic Arc	Phreatic activity continued at Canlaon during 18-23 May, with ash-and-steam plumes rising to ~1 km above the volcano (~11,300 ft a.s.l.). This activity was not recorded in seismic data. The sulfur-dioxide flux on 22 May was at ~2,080 metric tons per day, much higher than the normal flux of 500 metric tons per day. Canlaon remained at Alert Level 1, with a 4-km Permanent Danger Zone around the summit off limits to visitors. Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Karymsky (Russia) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	During 13-20 May, seismic activity and the height of ash explosions increased at Karymsky in comparison to the previous week. Ash-and-gas plumes rose to ~3.5 km above the crater (16,500 ft a.s.l.) and fresh ash deposits were present on the W and E sectors of the volcano. A thermal anomaly continued to be visible on satellite imagery. Karymsky remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	On 18 May lava from Kilauea continued to enter the sea at three areas. Surface lava flows were visible on the coastal plain and on the Pulama pali fault scarp. Volcanic tremor remained above background levels at Kilauea’s summit and at moderate levels at Pu`u `O`o. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Krakatau (Indonesia) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Krakatau Sunda Volcanic Arc	An increase in seismic activity at Krakatau around 16 May prompted DVGHM to raise the Alert Level at the volcano from 1 to 2 (on a scale of 1-4) on the 16th. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Pacaya (Guatemala) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Pacaya Central America Volcanic Arc	Incandescent lava was ejected ~50 m from Pacaya's crater on 17 May and an intra-crater lava flow extended ~300 m from the SW base of the central cone. On 20 May a thin plume rose ~500 m above the volcano's crater (~10,000 ft a.s.l.). Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Reventador (Ecuador) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Reventador Andean Northern Volcanic Arc	Based on information from IG, the Washington VAAC reported that an eruption at Reventador on 19 May around 0900 produced a NW-drifting ash plume to 3.7-4.9 km (12,000-16,000 ft) a.s.l. Ash was not visible on satellite imagery due to meteorological clouds near the volcano. Source: Washington Volcanic Ash Advisory Center (VAAC)
Santa Maria (Guatemala) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Santa Maria Central America Volcanic Arc	Constant avalanches occurred from lava-flow fronts on the SW flank of Santa Maria's Santiaguito lava-dome complex on 17 May. Explosions during 17-20 May produced ash clouds to a height of ~1 km above the volcano (15,700 ft a.s.l.); ash fell 7-10 km from Caliente Dome. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Semeru (Indonesia) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Semeru Sunda Volcanic Arc	Satellite imagery on 21 May showed a thin plume from Semeru at a height of ~4.6 km (~15,000 ft) a.s.l. extending to the S and later SSE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sheveluch (Russia) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	No explosive events were recorded at Shiveluch during 13-20 May, however, gas-and-steam plumes rose as high as 1.2 km above the lava dome (12,100 ft. a.s.l.). Satellite imagery showed a persistent thermal anomaly at the lava dome. Shiveluch remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufriere Hills (United Kingdom) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Soufriere Hills Lesser Antilles Volcanic Arc	During 13-20 May, the seismic network at Soufrière Hills recorded 18 volcano-tectonic earthquakes (most occurred on 17 May) and 3 hybrid earthquakes. Steam venting that began on the NW side of the crater on 15 April continued. The daily recorded sulfur-dioxide flux varied from a low of 222 metric tons per day (t/d) on 16 May to a maximum of 363 t/d on 14 May, with an average of 286 t/d. This was below the eruption's long-term average of 500 t/d. Source: Montserrat Volcano Observatory (MVO)
St. Helens (United States) | 18 May-24 May 2005 | Continuing ActivityCite this Report
St. Helens High Cascades Volcanic Arc	During 18-24 May, growth of the new lava dome inside the crater of Mount St. Helens continued, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. Seismicity and ground deformation continued at rates similar to those of the previous few weeks. St. Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Tungurahua (Ecuador) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Tungurahua Andean Northern Volcanic Arc	Volcanic and seismic activity remained at relatively low levels at Tungurahua during 18-23 May, with mainly emissions of steam and gas. On 19 May around 1200 an emission produced an ash-and-steam plume to a height of ~500 m (18,100 ft a.s.l.) that drifted N. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ulawun (Papua New Guinea) | 18 May-24 May 2005 | Continuing ActivityCite this Report
Ulawun Bismarck Volcanic Arc	Satellite imagery on 19 May showed a small plume from Ulawun at an unknown height extending W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,322 individual reports over 1,229 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.

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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)