All times are local unless otherwise stated.

Rinjani (Indonesia) | 17 June-23 June 2009 | New Activity / Unrest Cite this Report
Rinjani Sunda Volcanic Arc	Based on analysis of satellite imagery, the Darwin VAAC reported that during 21 June ash plumes from Rinjani rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 55 km N. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sarychev Peak (Russia) | 17 June-23 June 2009 | New Activity / Unrest Cite this Report
Sarychev Peak Kuril Volcanic Arc	The eruption from Sarychev Peak that began on 11 June continued through the 19th. SVERT reported another explosive eruption at 1730 UTC on 15 June, followed by the satellite observation of a plume early on 16 June that extended 360 km NW. The Tokyo VAAC estimated that the 16 June plume rose to an altitude of 9.7 km (32,000 feet) a.s.l., while higher ash clouds from earlier explosions reached 13.7 km (45,000 feet) altitude. Ash emissions continued during 17-18 June, causing ashfall in Yuzhno-Sakhalinsk, and gas-and-steam plumes spread NE and SW. Thermal anomalies were detected in satellite data on 18 and 19 June, but cloudy conditions prevented clear observations. One MODIS image on 18 June showed an ash plume spreading SW above the weather clouds. Although the Aviation Color Code was lowered from Red to Orange on 19 June, satellite observations showed that a diffuse ash cloud had spread approximately 20 km S and 40 km W of the volcano. Source: Sakhalin Volcanic Eruption Response Team (SVERT)

Arenal (Costa Rica) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Arenal Central America Volcanic Arc	Three strong eruptions on 16 June resulted in pyroclastic flows. The National Park was evacuated as a precaution, but reopened the next day. Increased degassing the previous week had prompted an elevation of the hazard status to Level 3 (on a scale of 1-4). Sources: Inside Costa Rica, Tico Times
Bezymianny (Russia) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Bezymianny Eastern Kamchatka Volcanic Arc	Reports from KVERT since August 2008 have indicated continuing dome growth and weak fumarolic activity at Bezymianny, with thermal anomalies visible in satellite data when the volcano was visible. Over the previous month such anomalies were seen on 21 and 30 May, and 2-4, 7, and 11-14 June. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Chaiten (Chile) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Chaiten Southern Andean Volcanic Arc	As noted in an OVDAS-SERNAGEOMIN report, eruptive activity continued during 8-16 June with sustained growth of the lava dome complex, from which block-and-ash flows were generated. Steam-and-ash plumes generally rose 1.5 km above the dome. Seismicity remained at typical levels. The Alert Level remained at Red. Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Ebeko (Russia) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Ebeko Kuril Volcanic Arc	KVERT reported that gas-and-steam plumes rose to an altitude of 1.7 km (5,600 ft) a.s.l. during 13-18 June. The Level of Concern Color Code remained at Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Galeras (Colombia) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Galeras Northern Andean Volcanic Arc	Increased sulfur-dioxide degassing and seismicity related to fluid movement, resulting in the overall lowering of pressure in the system, prompted INGEOMINAS to further lower the alert level to Yellow (Level III) on 19 June. By 23 June some rock-fracture seismicity had been detected, though events related to fluid movement had declined significantly. That same day clear weather allowed observation of a small gas column with minor ash content, while scientists on a monitoring flight saw gas emissions near the crater rim and recorded a thermal anomaly within the main crater. Source: Servicio Geológico Colombiano (SGC)
Karymsky (Russia) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	Satellite data reported by KVERT indicated a weak thermal anomaly over the volcano on 4-6 and 13-14 June. Gas-and-steam plumes extended 30 km SE on 4 June. The Level of Concern Color Code remained at Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	Daily reports from HVO about Kilauea during 17-23 June indicated continuing visible glow from the Halema'uma'u vent. Molten lava remained in the neck of a funnel-shaped cavity in the floor of Halema'uma'u Crater. Webcam views showed the lava level rising several meters for brief periods before returning to depths of about 290 m below the crater rim and 205 m below the crater floor, as determined by laser-ranging measurements. Throughout the week lava from east rift zone vents flowed through tubes to the coast and entered the ocean at two locations west of Kalapana; active surface flows also continued on the pali within the abandoned Royal Gardens subdivision. Sulfur dioxide emission rates from the Halema`uma`u and Pu`u `O`o vents remained elevated. The plume continued to carry glassy bits of spatter and small amounts of ash. A deflation-inflation event began on 22 June and was continuing the next day. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Koryaksky (Russia) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Koryaksky Eastern Kamchatka Volcanic Arc	Moderate to strong fumarolic activity at Koryaksky has been reported by KVERT in recent weeks. Satellite data showed a weak thermal anomaly over the volcano 11 and 13 June. The Level of Concern Color Code remained at Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Krakatau (Indonesia) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Krakatau Sunda Volcanic Arc	A news report on 18 June noted that activity at Krakatau had increased significantly. According to the head of the volcano monitoring post in Pasauran village there were 828 small eruptions in the previous six days, reaching the rate of a new explosion every three minutes. Observers on beaches in Java could clearly see rising white gas-and-steam plumes along with incandescent ejecta at night. Residents also reported loud explosion noises. The level of activity decreased again on 19 June, and the Alert Level remained at 3 (on a scale of 1-4). Source: Antara News
Llaima (Chile) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Llaima Southern Andean Volcanic Arc	The camera in Melipueco used by OVDAS-SERNAGEOMIN to monitor Llaima again showed glow on the NW inner margin of the main crater during 9-16 June. Occasional steam emissions with minor amounts of ash were also seen from the E flank. Seismic tremor has also increased since 5 June. The Alert Level remained at Yellow. Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Rabaul (Papua New Guinea) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Rabaul Bismarck Volcanic Arc	An RVO report for 12-18 June noted that the Tavurvur cone at Rabaul produced pale gray ash plumes during 16-17 June. Activity after that consisted primarily of dense white steam plumes, with occasional ash emissions. Continuous glow was seen at night. Source: Rabaul Volcano Observatory (RVO)
Redoubt (United States) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Redoubt Alaska Peninsula Volcanic Arc	Seismicity at Redoubt, as reported by AVO, was low during 17-23 June, but remained above background level. Seismicity was primarily comprised of small, discrete events associated with continued growth and instability of the lava dome. Webcam images on 19 and 23 June showed continued steam and gas emissions from the dome. Poor weather conditions throughout the week limited fieldwork opportunities, but one crew was able to observe the dome on 15 June. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Sheveluch (Russia) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	A new viscous lava flow from the lava dome was reported by KVERT during 11-18 June. Satellite thermal data indicated a large anomaly over the lava dome the entire week. Above-background levels of seismicity persisted throughout that time. Video recordings revealed ash plumes up to an altitude of 6.1 km (20,000 ft) a.s.l on 12-15 and 18 June. Ash plumes extended up to 50 km (31 miles) to the south 11 and 13-14 June. Another ash cloud on 12 June was 40 x 20 km in size at a distance of 140 km (87 miles) SW. Moderate to strong gas-and-steam plumes were observed during other times. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Tungurahua (Ecuador) | 17 June-23 June 2009 | Continuing ActivityCite this Report
Tungurahua Northern Andean Volcanic Arc	Continued moderate seismic and eruptive activity was reported by the IG during 17-23 June. Explosions with resulting ashfall were reported on most days. Lava fountains were observed on the night of 21 June rising to a height of 500 m above the crater. Incandescent blocks seen over the next two days rolled as far as 2 km downslope. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,627 individual reports over 1,243 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.

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)