All times are local unless otherwise stated.

Aira (Japan) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Aira Ryukyu Volcanic Arc	JMA reported that 34 explosions from Sakura-jima's Showa Crater ejected tephra as far as 1,300 m during 26-30 August. Incandescence from the crater was visible at night on 26 August. An explosion on 29 August at 0927 generated an ash plume that rose 3 km and caused ashfall in areas from Miyazaki (80 km NW) to Kagoshima (12 km W). Tephra 1 cm in diameter was confirmed in an area 4 km E. Based on information from JMA, the Tokyo VAAC reported that during 28 August-3 September explosions generated plumes most days that rose to altitudes of 1.5-4 km (5,000-13,000 ft) a.s.l. and drifted E, NE, and NW. On 31 August a pilot observed an ash plume that rose to an altitude of 2.7 km (9,000 ft) a.s.l. and traveled NE. Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)
Dukono (Indonesia) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 29 August and during 31 August-3 September ash plumes from Dukono rose to altitudes of 2.4-3 km (8,000-10,000 ft) a.s.l. and drifted 80-240 km W and NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Guntur (Indonesia) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Guntur Sunda Volcanic Arc	CVGHM reported that the number of deep and shallow volcanic earthquakes at Guntur increased during 15-21 August; seismicity declined after that period. On 30 August at 0820 seismicity again increased, characterized by continuous tremor that lasted until 1450. At 1600 CVGHM raised the Alert Level to 2 (on a scale of 1-4) and reminded residents and visitors not to approach the active crater within a 2-km radius. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Iliwerung (Indonesia) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Iliwerung Sunda Volcanic Arc	CVGHM reported that observers at a post 6 km away from Iliwerung reported that diffuse fumarolic emissions from the crater were visible during the mornings from 19 August to 1 September. Seismicity decreased on 19 August and remained at normal levels. On 2 September the Alert Level was lowered to 1 (on a scale of 0-4). Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Karangetang (Indonesia) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Karangetang Sangihe Volcanic Arc	Based on observations from the post in Salili, CVGHM reported that, although Karangetang was sometimes covered in fog during 1 August-2 September, white plumes were seen rising as high as 500 m above the main crater and as high as 300 m above Crater II. Incandescence from the crater was often observed at night. Avalanches began traveling down the Batuawang drainage on 2 September and then intensified the next day. The Alert Level was raised to 3 (on a scale of 1-4) on 3 September. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Klyuchevskoy (Russia) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	KVERT reported that moderate seismic activity at Kliuchevskoi was detected during 23-30 August. A video camera recorded incandescence from the summit at night and gas-and-steam plumes containing minor amounts of ash. A large thermal anomaly from the lava dome was detected in satellite images. Strombolian activity that began on 15 August continued; a new lava flow effused onto the SW flank on 26 August, producing a thermal anomaly detected in satellite images. The Aviation Color Code remained at Yellow. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Santa Maria (Guatemala) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Santa Maria Central America Volcanic Arc	INSIVUMEH reported that during 28-29 August abundant degassing at Santa María's Santiaguito lava-dome complex generated gas plumes that rose 2.7 km. During 29-31 August explosions produced ash plumes that rose 700-900 m and sometimes drifted SW. Block avalanches descended the S and E flanks. On 31 August a lahar traveled down the Nima I drainage on the S flank carrying 2-m-diameter blocks, tree branches, and tree trunks. Cloud cover prevented views on 2 September. Overnight during 2-3 September explosions generated ash plumes that rose 700 m and drifted SW. Block avalanches descended the S flank. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Suwanosejima (Japan) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Suwanosejima Ryukyu Volcanic Arc	According to the Tokyo VAAC, the JMA reported that on 28 August pilots observed ash plumes from Suwanose-jima that rose to altitudes of 3-3.7 km (10,000-12,000 ft) a.s.l. and drifted E and NW. Explosions during 28-29 August generated ash plumes that rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted NE. Ash was detected in satellite images on 29 August, and explosions were detected on 30 August and 1 September. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Ubinas (Peru) | 28 August-3 September 2013 | New Activity / Unrest Cite this Report
Ubinas Central Andean Volcanic Arc	IGP reported six phreatic explosions from Ubinas during 1-3 September. The series of explosions decreased in both energy and length of the tremor signal associated with each explosion; tremor lasted 75 minutes for the first explosion and 5-10 minutes for the last one. Most of the explosions generated ash plumes that rose 1.5-2 km above the crater. The first explosion occurred at 2246 on 1 September, lasted 110 seconds, ejected ballistics up to 2 m in diameter, and caused ashfall 2 km ENE. The second explosion, at 1552 on 2 September, lasted 292 seconds and ejected fewer ballistics. Details for the 3rd through the 6th explosions are as follows: the 3rd occurred at 2350 on 2 September and lasted 279 seconds; the 4th occurred at 0809 on 3 September and lasted 296 seconds; the 5th occurred at 1021 on 3 September and lasted 288 seconds; the 6th occurred at 1029 on 3 September and lasted 74 seconds. Source: Instituto Geofísico del Perú (IGP)

Batu Tara (Indonesia) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Batu Tara Sunda Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin Volcanic Ash Advisory Centre (VAAC) reported that during 2-3 September ash plumes from Batu Tara rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 75 km W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chirinkotan (Russia) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Chirinkotan Kuril Volcanic Arc	SVERT reported that a thermal anomaly from Chirinkotan was detected in satellite images on 1 September. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Chirpoi (Russia) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Chirpoi Kuril Volcanic Arc	SVERT reported that a thermal anomaly from Snow, a volcano of Chirpoi, was detected in satellite images on 1 September. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Fuego (Guatemala) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Fuego Central America Volcanic Arc	INSIVUMEH reported that during 28-31 August explosions from Fuego generated ash plumes that rose 450-550 m and drifted 8-10 km W and NW. During 28-29 August incandescent material was ejected 150 m high, and white plumes rose 350 m and drifted NW. During 30-31 August rumbling was heard 15 km away. Lava flows 200 m long were active in the Trinidad drainage on the S flank and produced avalanches. In a special bulletin on 2 September, INSIVUMEH reported that a series of pyroclastic flows descended the Ceniza (SSW) drainage, reaching the base of the volcano. Ash plumes rose 3 km and drifted E, S, W, and NW. During the night lava from the crater flowed 300-400 m down the Ceniza drainage. Explosions were heard, but cloud cover prevented observations through the morning of 3 September. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Karymsky (Russia) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that moderate seismic activity at Karymsky was detected during 23-30 August. Based on seismic interpretation, possible ash plumes rose to an altitude of 3.5 km (11,500 ft) a.s.l. Satellite imagery showed a weak thermal anomaly on the volcano during 26-27 August. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Ketoi (Russia) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Ketoi Kuril Volcanic Arc	SVERT reported that a possible thermal anomaly over Ketoi's Pallas Peak was detected in satellite images on 26 August and 1 September. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Kilauea (United States) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 28 August-2 September HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema'uma'u Crater; the lake level was 45-52 m below the Halema'uma'u crater floor during 30-31 August and 2-3 September. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas. At Pu'u 'O'o Crater, glow emanated from spatter cones on the N and S portions of the crater floor. The Kahauale’a 2 lava flow, fed by the NE spatter cone, was active with scattered break-out flows and burned the forest N of Pu'u 'O'o. A small and brief lava flow issued from the NE spatter cone on 30 August. Peace Day activity, fed by lava tubes extending from Pu'u 'O'o, consisted of some breakouts on the pali and coastal plain. A brief plume near the ocean entry on 2 September possibly signified a small bench collapse. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Kizimen (Russia) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Kizimen Eastern Kamchatka Volcanic Arc	KVERT reported that during 23-30 August moderate seismic activity continued at Kizimen. Video and satellite data showed that lava continued to extrude from the summit, producing incandescence, strong gas-and-steam activity, and hot avalanches on the W and E flanks. A thermal anomaly was detected daily in satellite images. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Manam (Papua New Guinea) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Manam Bismarck Volcanic Arc	RVO reported that Manam's Southern Crater was quiet during 16-17 August. Occasional light-gray emissions observed during 18-20, 22-23, and 25 August rose 100 m above the crater and drifted NW. Incandescence from the crater was seen during 18-19 and 21-26 August, and incandescent fragments were ejected during 21-25 August. A small eruption began at 1830 on 26 August with emissions of dark ash clouds that rose 500-600 m. Bright incandescence from the crater and occasional ejected incandescent fragments were observed. Roaring and rumbling was heard by island residents as well as residents in Bogia, 25-30 km SSW of Manam on the N coast of the mainland. By the next morning the emissions decreased and were light gray to brown. Source: Rabaul Volcano Observatory (RVO)
Popocatepetl (Mexico) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Popocatepetl Trans-Mexican Volcanic Belt	CENAPRED reported that during 28 August-3 September seismicity at Popocatépetl indicated continuing emissions; cloud cover sometimes prevented observations of the crater. Incandescence from the crater was observed on most nights. On 28 August gas, steam, and ash plumes rose 200-800 m and drifted SW. Gas-and-steam plumes were observed the next day. On 30 August gas and steam plumes that sometimes contained ash rose 1 km above the crater and drifted W. During 1-2 September steam and gas plumes containing minor amounts of ash drifted WSW. Ashfall was reported in Tetela del Volcán (20 km SW) and Ocuituco (24 km SW) on 1 September, and in Ecatzingo (15 km SW) on 2 September. The Alert Level remained at to Yellow, Phase Two. Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Rabaul (Papua New Guinea) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Rabaul Bismarck Volcanic Arc	Based on observations of satellite imagery and wind data analyses, the Darwin VAAC reported that on 29 August ash plumes from Rabaul caldera's Tavurvur cone rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted almost 40 km NW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sheveluch (Russia) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	Based on visual observations and analyses of satellite data, KVERT reported that during 23-30 August a viscous lava flow effused onto the N and NW flanks of Shiveluch's lava dome, accompanied by hot avalanches, incandescence, and fumarolic activity. A thermal anomaly was detected daily in satellite images. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Veniaminof (United States) | 28 August-3 September 2013 | Continuing ActivityCite this Report
Veniaminof Aleutian Ridge Volcanic Arc	AVO reported that during 27-29 August seismicity at Veniaminof was characterized by discreet episodic tremor bursts, likely associated with lava effusion and minor ash emissions. Satellite images detected prominent thermal anomalies at the intracaldera cone. Activity increased on 30 August and was some of the strongest detected since the eruption began in early June; intense seismicity, lava fountaining, and ash emissions to 4.6-6.1 km (15,000-20,000 ft) a.s.l. were observed. Ash plumes drifted SE and caused ashfall in areas downwind including Perryville (32 km SSE). Elevated and continuous tremor persisted during 31 August-3 September; cloud cover and fog obscured web-cam and satellite views. The Volcano Alert Level remained at Watch and the Aviation Color code remained at Orange. Source: US Geological Survey Alaska Volcano Observatory (AVO)

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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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)