All times are local unless otherwise stated.

Gamkonora | 11 July-17 July 2007 | New Activity / Unrest Cite this Report

Gamkonora Halmahera

CVGHM reported that on 10 July, incandescent material from Gamkonora was propelled about 5 m above the summit and intermittently showered the flank. On 11 July, ash plumes rose to altitudes of 5.9-9.4 km (19,400-30,800 ft) a.s.l. During 12-15 July, visual observations of ash plumes were hindered by cloud cover. On 16 July, the Alert Level was lowered from 4 to 3 (on a scale of 1-4) due to a drastic decrease in seismic activity, a decline in ash plume altitudes, and the absence of incandescence observed at the summit during 11-15 July. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Bulusan | 11 July-17 July 2007 | Continuing ActivityCite this Report
Bulusan Luzon (Philippines)	On 13 July, PHIVOLCS lowered the Alert Level for Bulusan from 2 to 1 (out of 5) due to a decline in activity including decreased seismicity, below baseline sulfur dioxide output, and deflation relative to the previous survey. Steam plumes from active vents and fissures were observed. Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Karymsky | 11 July-17 July 2007 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka (Russia)	During 6-13 July, seismic activity at Karymsky was above background levels. Based on seismic interpretation, ash plumes may have risen to altitudes of 2.5 km and 3.8 km (8,200 ft and 12,500 ft) a.s.l. on 7 and 10 July, respectively. A thermal anomaly in the crater was visible on satellite imagery during 10-11 July. The Level of Concern Color Code remained at Orange. Based on pilot reports, satellite imagery, observations in the Petropavlovsk-Kamchatsky Flight Information Region (FIR), and KEMSD, the Tokyo VAAC reported that an ash plume rose to an altitude of 9.1 (30,000 ft) a.s.l. on 11 July. Based on information from KEMSD, the Tokyo VAAC reported that an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. on 16 July. Ash was not identified on satellite imagery. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea | 11 July-17 July 2007 | Continuing ActivityCite this Report
Kilauea Hawaiian Islands (USA)	The W vent and dominant E vent in Kilauea's Pu'u 'O'o crater fed a growing lava lake during 11-13 July. Levees built up from overflows during 11-12 July. On the S wall of West Gap pit, intermittent incandescence and fuming from new vents that opened were observed during 13-14 July. On 14 July, the level of the lava lake dropped but remained active near the E vent. On 15 July, the E and W vents erupted small lava flows that drained onto the solidifying lava lake bed. Low lava fountains were observed from West Gap pit. During 15-17 July, lava filled the pit and overflowed into the main crater. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Klyuchevskoy | 11 July-17 July 2007 | Continuing ActivityCite this Report
Klyuchevskoy Central Kamchatka (Russia)	KVERT reported that seismic activity at Kliuchevskoi had decreased, but remained above background levels during 6-13 July. Ash plumes were visible on satellite imagery drifting NE and NW during 5-11 July. Plumes rose to estimated altitudes of 5-6.5 km (16,400-21,300 ft) a.s.l. based on atmospheric profiles. Based on video data, ash plumes rose to an altitude of 7 km (23,000 ft) a.s.l. during 9-11 July. The Level of Concern Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Langila | 11 July-17 July 2007 | Continuing ActivityCite this Report
Langila New Britain (Papua New Guinea)	RVO reported that emission of ash plumes from Langila's Crater 2 continued during 6-7 and 9-13 July. Ash plumes rose to an altitude less than 2.3 km (7,500 ft) a.s.l. and drifted N and NW. Crater 3 was quiet. Source: Rabaul Volcano Observatory (RVO)
Pacaya | 11 July-17 July 2007 | Continuing ActivityCite this Report
Pacaya South-Central Guatemala	On 13 July, INSIVUMEH reported that lava on the NE flank of Pacaya's MacKenney Cone branched into three flows. Two flows traveled 100 m and 200 m to the N and one traveled 300 m to the NE. Incandescence was observed from a hornito in the summit crater. White plumes were observed. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Rabaul | 11 July-17 July 2007 | Continuing ActivityCite this Report
Rabaul New Britain (Papua New Guinea)	RVO reported that during 10-11 July, ash plumes from Rabaul caldera's Tavurvur cone rose to an altitude less than 1.2 km (3,900 ft) a.s.l. and drifted N and NW. Fine ash fell in areas downwind, including Rabaul Town. During 12-14 July, white and blue vapor plumes drifted N and NW. A mild smell of sulfur gas was reported from areas downwind. On 17 July, an explosion was accompanied by a loud booming noise and an ash plume. The flanks were showered with lava fragments. The ash plume rose to an altitude less than 1.2 km (3,900 ft) a.s.l. and drifted NW. Ashfall was reported from Rabaul Town, Malaguna, and surrounding areas. White and blue vapor plumes were observed during 14-16 July. Roaring noises were heard and incandescence was visible at night. Source: Rabaul Volcano Observatory (RVO)
Santa Maria | 11 July-17 July 2007 | Continuing ActivityCite this Report
Santa Maria Southwestern Guatemala	During 11-12 July, INSIVUMEH reported 27 explosions from Santa María's Santiaguito lava dome complex based on seismic interpretation. Ash plumes from the explosions drifted SW. Explosions from Caliente dome on 13 July produced ash plumes that rose to altitudes of 4.3-5.3 km (14,100-17,400 ft) a.s.l. and drifted SW. Ashfall was reported from areas downwind. Incandescent avalanches of blocks from Caliente dome were observed. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sheveluch | 11 July-17 July 2007 | Continuing ActivityCite this Report
Sheveluch Central Kamchatka (Russia)	KVERT reported that seismic activity at Shiveluch continued above background levels during 6-13 July. Based on seismic interpretation, ash plumes rose to an altitude of 6.5 km (21,300 ft) a.s.l. during the reporting period. Gas-and-steam plumes rose to altitudes of 4-5 km (13,100-16,400 ft) a.s.l. during 9-11 July. A large thermal anomaly was detected in the crater on satellite imagery all days. The Level of Concern Color Code remained at Orange. Sources: Tokyo Volcanic Ash Advisory Center (VAAC), Kamchatkan Volcanic Eruption Response Team (KVERT)
Soufriere Hills | 11 July-17 July 2007 | Continuing ActivityCite this Report
Soufriere Hills Montserrat	MVO reported that during 6-13 July the lava dome at Soufrière Hills changed very little based on visual observations, and seismic activity was very low. Low-level rockfall activity continued. The Alert Level remained elevated at 4 (on a scale of 0-5). Source: Montserrat Volcano Observatory (MVO)
St. Helens | 11 July-17 July 2007 | Continuing ActivityCite this Report
St. Helens Washington	Data from deformation-monitoring instruments and time-lapse cameras on the volcano indicated that lava-dome growth at Mount St. Helens continued during 11-17 July. Based on the time-lapse camera images, the lava dome was displaced southward and westward, at an average rate of 0.5 m per day at particular points. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Tungurahua | 11 July-17 July 2007 | Continuing ActivityCite this Report
Tungurahua Ecuador	IG reported that during 11-16 July, ash plumes intermittently visible from Tungurahua rose to altitudes of 5.3-7 km (17,400-23,000 ft) a.s.l. and drifted N and W. Ashfall was reported from areas SW during 11-12 and 14-16 July. On 13 July, roaring noises were heard and "cannon shots" rattled windows of houses in areas to the W. A steam plume rose to an altitude of 5.2 km (17,100 ft) a.s.l. and drifted W. On 14 July, fumaroles were spotted on the NW flank. On 15 July, lahars traveled down W and S drainages. Lahars in a NW drainage temporarily blocked a road. "Cannon shots" and roaring noises were heard during 15-16 July. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,019 individual reports over 1,216 weeks (average of 16 per week) on 332 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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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)