All times are local unless otherwise stated.

Gorely (Russia) | 28 July-3 August 2010 | New Activity / Unrest Cite this Report
Gorely Kuril Volcanic Arc	KVERT reported that during 23-30 July seismic activity from Gorely was above background levels and volcanic tremor continued to be detected. A daily thermal anomaly on the volcano was seen in satellite imagery. Gas-and-steam activity was noted during 26-27 July. The Aviation Color Code level remained at Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 28 July-3 August 2010 | New Activity / Unrest Cite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 28 July-3 August HVO reported that activity at Kilauea continued from the summit and the east rift zone. At the summit, the level of a lava-pool surface in the deep pit within the floor of Halema'uma'u crater remained mostly stable; glow from the vent was also visible at night. A plume from the vent mainly drifted SW, dropping small amounts of ash downwind. At the east rift zone, lava flows that broke out of the TEB lava-tube system advanced NE over coastal highway 137 towards Kalapana Gardens subdivision. Two lava lobes that had overtopped the Hakuma horst, SW of Kalapana Gardens, flowed into the ocean. The first flow initially entered the ocean on 25 July and continued to build a small delta that was about 500 m wide by 3 August. On 28 July, the second flow entered the ocean, about 545 m E of the first ocean-entry point. In addition to the activity near the ocean, scattered small active lobes of lava were seen about 1 km W of the highway 130/137 intersection. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Nevado del Huila (Colombia) | 28 July-3 August 2010 | New Activity / Unrest Cite this Report
Nevado del Huila Northern Andean Volcanic Arc	INGEOMINAS reported that periodically during 26 July-3 August sulfur dioxide plumes from Nevado del Huila were observed by ground-based instruments as well as satellite imagery. During 28-30 July INGEOMINAS noted that ash emissions reported by the Washington VAAC corresponded with increased seismicity. On 28, 30, and 31 July and 1 August gray fumarolic plumes drifting W were seen through the web camera at Tafxnú as well as a new web camera installed at Maravillas (12 km SE of Pico Central). The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity"). Source: Servicio Geológico Colombiano (SGC)
Rabaul (Papua New Guinea) | 28 July-3 August 2010 | New Activity / Unrest Cite this Report
Rabaul Bismarck Volcanic Arc	RVO reported that GPS data measurements showed deflation of Rabaul caldera's Tavurvur cone after the eruption that took place during 23-25 July. Seismicity was very low, and diffuse white plumes were emitted during 26-30 July. Source: Rabaul Volcano Observatory (RVO)

Aira (Japan) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	Based on information from JMA, the Tokyo VAAC reported an explosion on 29 July. Explosions during 31 July-1 August and 3 August produced plumes that rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted E and SW. On 2 July a pilot observed an ash plume that rose to an altitude of 3 km (10,000 ft) a.s.l. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Batu Tara (Indonesia) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Batu Tara Sunda Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that during 30-31 July an ash plume from Batu Tara drifted 65 km NW at an altitude of 1.5 km (5,000 ft) a.s.l. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chaiten (Chile) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Chaiten Southern Andean Volcanic Arc	Based on analyses of satellite imagery and web camera footage, the Buenos Aires VAAC reported that a plume from Chaitén's lava-dome complex drifted 20 km ENE on 30 July. An 18-km-wide ash plume also drifted 45 km ESE. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery, the Darwin VAAC reported that on 31 July an ash plume from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted over 90 km W. A diffuse ash plume drifted 130 km NNE on 3 August at the same altitude. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky (Russia) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that during 23-24 and 28 July seismic activity from Karymsky was above background levels and suggested that possible ash plumes rose to an altitude of 2 km (6,700 ft) a.s.l. Seismic data were not available other days during 25-30 July due to technical problems. A daily thermal anomaly was detected in satellite imagery. Imagery also showed ash plumes that drifted 15 km SE on 26 July. The Aviation Color Code level remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Klyuchevskoy (Russia) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that during 23-30 July seismic activity from Kliuchevskoi was above background levels and lava flowed down the SSE flank. Strombolian activity and gas-and-ash emissions were observed during 23-24 and 29 July. Cloud cover prevented observations the other days. Satellite imagery analysis showed a large daily thermal anomaly from the volcano and gas-and-ash plumes that drifted 145 km SW on 28 July. The Aviation Color Code level remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Machin (Colombia) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Machin Northern Andean Volcanic Arc	Observatory Vulcanológico and Sismológico de Manizales reported a seismic crisis at Cerro Machín on 24 July, characterized by volcano-tectonic earthquakes. One of the earthquakes was a M 2.6, located S of the main lava dome at a depth of 3.96 km. The next day a M 4.1 volcano-tectonic earthquake occurred 0.8 km S of the main dome at a depth of 3.88 km. On 29 July the number of volcano-tectonic events increased; the earthquakes were a maximum M 1.73 and between 3 and 4 km depth, S of the main dome. The Alert level remained at III (Yellow; "changes in the behavior of volcanic activity"). Source: Servicio Geológico Colombiano (SGC)
Pacaya (Guatemala) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Pacaya Central America Volcanic Arc	On 30 July INSIVUMEH reported that explosions from Pacaya's MacKenney cone were detected by the seismic network. Inclement weather prevented visual observations. During 2-3 August explosions produced ash plumes that rose 400-800 m above the crater and drifted S, causing fine ash to fall in areas 5 km away. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Planchon-Peteroa (Chile) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Planchon-Peteroa Southern Andean Volcanic Arc	Based on a pilot observation, the Buenos Aires VAAC reported that on 28 July a gas plume from Planchón-Peteroa drifted E. Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
Sheveluch (Russia) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 23-30 July seismic activity from Shiveluch was above background levels and a daily thermal anomaly was detected in satellite imagery. Possible ash plumes from hot avalanches and explosions on 28 and 29 July rose to altitudes of 4-6.5 km (13,100-21,300 ft) a.s.l. Gas-and-steam plumes were seen rising to an altitude of 4 km (13,100 ft) a.s.l. on 23 and 24 July. The Aviation Color Code level remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Taal (Philippines) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Taal Luzon Volcanic Arc	PHIVOLCS reported observations during the previous eight weeks after the Alert Level for Taal was raised to 2 (scale is 0-5, with 0 referring to No Alert status) on 8 June. Temperature measurements of the main crater lake did not increase further since 8 June, remaining between 330 and 340 degrees Celsius. The number of earthquakes recorded daily gradually declined to background levels beginning the second week of July. Hydrothermal activity in the N and NE sides of the main crater and Daang Kastila also decreased. Precise leveling measurements conducted during 13-21 July along the NE, SE, and SW flanks detected minimal inflation. On 2 August, PHIVOLCS lowered the Alert Level to 1. Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Tungurahua (Ecuador) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Tungurahua Northern Andean Volcanic Arc	The IG reported that during 28 July-2 August steam emissions rose from Tungurahua's crater. On most days steam plumes with minor ash content rose 1-2 km above the crater and drifted NW or W. Minor ashfall was reported to the SW in the Choglontus area during 28-29 July. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ulawun (Papua New Guinea) | 28 July-3 August 2010 | Continuing ActivityCite this Report
Ulawun Bismarck Volcanic Arc	RVO reported that white vapor plumes rose 300 m above Ulawun during 21-29 July. Light brownish ash clouds were observed on 23 and 24 July. Source: Rabaul Volcano Observatory (RVO)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 21,304 individual reports over 1,271 weeks (average of 17 per week) on 340 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)