All times are local unless otherwise stated.

Masaya (Nicaragua) | 23 April-29 April 2008 | New Activity / Unrest Cite this Report
Masaya Central America Volcanic Arc	Based on observations of satellite imagery and pilot observations, the Washington VAAC reported that an ash plume from Masaya rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted SW on 29 April. Source: Washington Volcanic Ash Advisory Center (VAAC)

Aira (Japan) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported that eruption plumes from Sakura-jima rose to an altitude of 2.4 km (8,000 ft) a.s.l. The plumes drifted SE on 27 April and W on 30 April. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Batu Tara (Indonesia) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Batu Tara Sunda Volcanic Arc	The Darwin VAAC reported that low-level ash-and-steam plumes from Batu Tara were observed on satellite imagery during 25-26 April. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Fuego (Guatemala) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Fuego Central America Volcanic Arc	The Washington VAAC reported that an ash plume from Fuego was visible on satellite imagery on 23 April and drifted SW. On 28 April, INSIVUMEH reported that explosions (1 per hour) produced ash plumes to an altitude of 4.4 km (14,400 ft) a.s.l. The plumes drifted 5 km SW. The explosions produced noises audible 15 km away and shock waves that rattled windows and structures in nearby villages. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Kanlaon (Philippines) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Kanlaon Negros-Sulu Volcanic Arc	According to news articles, PHIVOLCS lowered the Alert Level for Kanlaon to 0 on 25 April. Seismic activity was at background levels during 5 March-25 April, with 0-3 earthquakes per day. Mt. Kanlaon Natural Park opened for mountaineering activities; however visitors were warned that the risk of entering the 4-km permanent danger zone remained high. Source: Sun Star News
Karymsky (Russia) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Karymsky was above background levels during 18-25 April. Observations of satellite imagery revealed that a thermal anomaly was present in the crater on 18 and 21 April. Based on seismic interpretation, weak ash-and-gas explosions may have occurred on 20 and 21 April and produced plumes to altitudes of 2.6-3.4 km (8,500-11,200 ft) a.s.l. Volcanologists reported seeing ash plumes to an altitude of 2 km (6,700 ft) a.s.l. during 20-23 April. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	Based on observations during helicopter overflights, visual observations from HVO and National Park Service (NPS) crews, and web camera views, HVO reported that during 23-29 April lava flowed SE through a lava tube system underneath Kilauea's Thanksgiving Eve Breakout (TEB) and rootless shield complex to the Waikupanaha ocean entry. Incandescence from breakouts along the lava-tube system was noted on 23 April. During the reporting period, Kilauea summit earthquakes were located beneath the Halema'uma'u vent, beneath the S Kilauea caldera, NW of Pahala, along the S-flank faults, and along the SW rift zone. The eruption from the vent in Halema'uma'u Crater continued to produce white plumes with minor ash content that drifted mainly SW. During most nights incandescence was seen at the base of the plume. Seismic tremor was elevated. Sulfur dioxide emission rates from the summit area have been elevated at 2-4 times background values since early January. On 28 April, the emission rate at the summit was 1,910 tonnes per day, compared to a background rate of 150-200 tonnes per day. According to news articles, Hawaii Volcanoes National Park closed during 24-25 April due to elevated levels of sulfur dioxide. About 2,000 people were evacuated from the Park. Sources: US Geological Survey Hawaiian Volcano Observatory (HVO), Associated Press
Llaima (Chile) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Llaima Southern Andean Volcanic Arc	SERNAGEOMIN reported that on 24 April, seismicity from Llaima increased and gas-and-ash plumes associated with explosions rose to an altitude of 4.6 km (15,100 ft) a.s.l. No morphological changes to the summit were observed during an overflight on 25 April, except for a small increase of the diameter of the SE crater. Bluish gas was emitted from the main crater. Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Manam (Papua New Guinea) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Manam Bismarck Volcanic Arc	Based on observations of satellite imagery and information from RVO, the Darwin VAAC reported that a diffuse plume from Manam rose to an altitude of below 3 km (10,000 ft) a.s.l. and drifted NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Nevado del Huila (Colombia) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Nevado del Huila Northern Andean Volcanic Arc	INGEOMINAS reported that seismicity from Nevado del Huila decreased during 23-29 April. No significant morphological changes to the summit were noted during an overflight on 29 April, although the NE and NW flanks could not be seen due to strong winds. The Alert Level remains at Orange (on a 4-color scale where Orange is second highest). Source: Servicio Geológico Colombiano (SGC)
Rabaul (Papua New Guinea) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Rabaul Bismarck Volcanic Arc	RVO reported that during 23-29 April ash and ash plumes from Rabaul caldera's Tavurvur cone rose to altitudes of 1.7-2.7 km (5,600-8,900 ft) a.s.l. and drifted N, NE, E, SE, and SW. Incandescence at night at the summit, intermittent roaring noises, and occasional explosions were reported. Ashfall measured over 1 cm thick nearby and E of Tavurvur during 23-24 April and was noted in other areas downwind during 25-29 April. Incandescent fragments were propelled from the summit at night during 27-28 April. Source: Rabaul Volcano Observatory (RVO)
Santa Maria (Guatemala) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Santa Maria Central America Volcanic Arc	Based on observations of satellite imagery, the Washington VAAC reported that an ash plume from Santa María's Santiaguito lava dome complex rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted SW on 25 April. On 28 April, INSIVUMEH reported that weak explosions produced ash plumes that rose to an altitude of 4.1 km (13,500 ft) a.s.l. and drifted W. Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch (Russia) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that seismic activity at Shiveluch was above background levels during 18-25 April. Observations of satellite imagery revealed that a thermal anomaly was present in the crater during 18 and 20-23 April. According to video footage and visual observations, fumarolic activity from the lava dome occurred during 21-23 April. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Tungurahua (Ecuador) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Tungurahua Northern Andean Volcanic Arc	The IG reported that although visual observations were occasionally limited due to cloud cover during 22-28 April, ash-and-steam plumes from Tungurahua were spotted and rose to altitudes of 6-8 km (19,700-26,200 ft) a.s.l. Ashfall was reported in areas downwind on 23, 25, and 28 April. On 22 April, a small lahar descended the Mapayacu drainage to the SW. On 23 April, explosions accompanied by "cannon shot" noises produced ash plumes that drifted WSW and caused windows to rattle in areas to the NW, W, and SW. Blocks rolled 600 m down the flanks. On 25 April, fumarolic activity was noted on the interior of the NE crater rim. Sounds resembling blocks rolling down the flanks were reported. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ubinas (Peru) | 23 April-29 April 2008 | Continuing ActivityCite this Report
Ubinas Central Andean Volcanic Arc	Based on SIGMET reports and observations of satellite imagery, the Buenos Aires VAAC reported that an ash plume from Ubinas rose to altitudes of 5.5-9.1 km (18,000-30,000 ft) a.s.l. and drifted SE and S on 23 April. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,652 individual reports over 1,244 weeks (average of 17 per week) on 338 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)