All times are local unless otherwise stated.

Karthala (Comoros) | 13 April-19 April 2005 | New Activity / Unrest Cite this Report

Karthala Comoros Hotspot Volcano Group

According to news articles, eruptive activity at Karthala beginning on 17 April consisted of heightened seismicity, and gas and ash emissions. Hundreds of villagers who lived near the volcano evacuated. Flights to the island were cancelled. Scientists found that lava was confined to the bottom of the summit crater. Activity subsided around 19 April, with ash emissions ceasing. On the 19th, residents began to return to their homes and flights to the island resumed. Prior to the activity, scientists at the Mount Karthala Observatory reportedly recorded a "seismic crisis" on 24 March, consisting of 40 small earthquakes in comparison to the normal 15 earthquakes per day. Sources: Agence France-Presse (AFP), Reuters, Agence France-Presse (AFP)

Asosan (Japan) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Asosan Nankai Volcanic Arc	According to a news article, a small explosion at Aso on 14 April emitted a plume of "white smoke" to ~200 m above the crater (~5,900 ft a.s.l.) and deposited ash around the crater. The explosion occurred after hundreds of small earthquakes were recorded by JMA during the previous 2 weeks. Source: Associated Press
Chikurachki (Russia) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Chikurachki Kuril Volcanic Arc	On 7 April, an ash-and-gas plume rose to ~500 m above Chikurachki's crater (~7,600 ft a.s.l.) and extended ~10 km S. During 7-15 April, Chikurachki remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Colima (Mexico) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Arc	During 13-18 April there were several explosions at Colima. According to the Washington VAAC, resultant ash plumes rose to a maximum height of ~6.7 km (~22,000 ft) a.s.l. An explosion on 19 April at 2056 sent incandescent material down the volcano's flanks that did not exceed the established safety limits. On 20 April at 0705 a smaller explosion occurred. No evacuations were necessary. Sources: Washington Volcanic Ash Advisory Center (VAAC), Centro Universitario de Estudios Vulcanológicos (CUEV) - Universidad de Colima
Kanlaon (Philippines) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Kanlaon Negros-Sulu Volcanic Arc	During 13-14 April, mild ash emissions at Canlaon produced plumes to a height of ~700 m above the crater (~10,300 ft a.s.l.). During 15-17 April, moderate-to-strong emissions produced ash plumes to ~2 km above the crater (~14,600 ft a.s.l.) and deposited ash in villages as far as La Castellana (16 km SW of the crater). Canlaon remained at Alert Level 1 (on a scale of 0-5). Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Karymsky (Russia) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Seismic activity was above background levels at Karymsky during 8-15 April, with the number of shallow earthquakes increasing from 100 to 1,500 per day during the week. Possible ash-and-gas explosions may have reached 1 km above the crater (8,300 ft a.s.l.) during 12-13 April. Ash-and-gas plumes extended ~30 km on 8 and 9 April. Ash deposits extended ~10 km on the S side of the volcano. Karymsky remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 14-19 April, surface lava flows from Kilauea were visible on the Pulama pali fault scarp and lava was not seen entering the ocean. Seismicity remained above background levels at Kilauea's summit, consisting mainly of tremor and some long-period earthquakes. Volcanic tremor was at moderate levels at Pu`u `O`o. Episodes of inflation and deflation occurred during the week. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy (Russia) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	Seismic activity at Kliuchevskoi decreased during 8-15 April, but remained above background levels. Gas-and-steam plumes rose to low levels above the crater. Kliuchevskoi remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Krakatau (Indonesia) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Krakatau Sunda Volcanic Arc	Due to a decrease in seismic activity at Krakatau over a 4-day period, the Alert Level at the volcano was reduced from 2 to 1 (on a scale of 1-4) on 19 April. The volcano was considered to be at a normal level of activity. Visitors were still banned from the summit and crater of Anak Krakatau due to toxic gas emission. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Popocatepetl (Mexico) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Popocatepetl Trans-Mexican Volcanic Arc	Based on information from CENAPRED, the Washington VAAC reported that on 19 April light gas emission and incandescence were visible in Popocatépetl's crater. Meteorological clouds obscured satellite views of the crater. The Washington VAAC reported that aircraft should avoid flying over Popocatépetl in case increased activity produced an ash plume. Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)
Sheveluch (Russia) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	Gas-and-steam plumes rose to ~400 m above Shiveluch's 2.5-km-high lava dome (~9,500 ft a.s.l.) on 8 April and one extended ~50 km SW on the 14th. A thermal anomaly was visible at the lava dome on satellite imagery during the week, except on 10 April. Shiveluch remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
St. Helens (United States) | 13 April-19 April 2005 | Continuing ActivityCite this Report
St. Helens High Cascades Volcanic Arc	During 13-19 April, 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. GPS instruments showed that displacement of the old lava dome had slowed for several days around 18 April. CVO reported that such relative quiescence has been observed previously at the volcano during the current eruption, and should not be taken to mean that the eruption was ending. St. Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Talang (Indonesia) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Talang Sunda Volcanic Arc	According to DVGHM, the eruption that began at Talang on 12 April ended on 14 April. During 14-17 April, the intensity of the activity at the volcano decreased so DVGHM reduced the Alert Level from 4, the highest level, to 3. People were permitted to return their homes near the volcano, but no one could enter within 1 km of the summit. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Tangkuban Parahu (Indonesia) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Tangkuban Parahu Sunda Volcanic Arc	At Tangkubanparahu "white thin smoke" was emitted from Upas Baru crater and Ratu crater on 14 April, and from Upas Baru crater on 15 April. On 14 and 15 April shallow and deep volcanic earthquakes were recorded. During this time visitors were banned from the volcano. On 19 April the Alert Level was reduced from 3 to 2 (on a scale of 1-4) and the volcano was opened to the public, but access was restricted around Ratu crater and not permitted at the other craters. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Tungurahua (Ecuador) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Tungurahua Northern Andean Volcanic Arc	During 14-17 April, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy gas-and-steam plumes were emitted. On 18 April at 2057 a moderate explosion occurred that sent incandescent volcanic blocks rolling down the volcano's flanks. Ash fell S of the city of Ambato. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Villarrica (Chile) | 13 April-19 April 2005 | Continuing ActivityCite this Report
Villarrica Southern Andean Volcanic Arc	According to a news report, the Oficina Nacional de Emergencia reported that unusual seismicity was recorded at Villarrica during early April. Fresh ash deposits were seen outside of the volcano's crater. Visitors were banned from climbing the volcano. Source: El Mercurio

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 21,279 individual reports over 1,270 weeks (average of 17 per week) on 340 different volcanoes.

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

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 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.

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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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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)