All times are local unless otherwise stated.

Ijen | 21 March-27 March 2012 | New Activity / Unrest Cite this Report
Ijen Eastern Java	On 24 March, CVGHM reported that Ijen's lake water chemistry changed during 10 January-17 March, exhibiting a significant increase in carbon dioxide, especially after 5 February, and an increase in acidity. The lake surface temperature increased from 28.8 degrees Celsius on 3 March to 45.1 degrees Celsius on 17 March. The lake water temperature at a depth of 5 m also rose from 42.7 to 44.7 degrees Celsius on 3 and 17 March, respectively. Seismicity increased starting in March. The Alert Level remained at 2 (on a scale of 1-4). [Correction: the Alert Level remained at 3.] Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Iliamna | 21 March-27 March 2012 | New Activity / Unrest Cite this Report
Iliamna Alaska Peninsula	AVO reported that during 21-27 March seismicity at Iliamna remained above background levels, although just slightly during 25-27 March. When not obscured by clouds, satellite and web camera views showed nothing unusual. The Alert Level remained at Advisory and the Aviation Color Code remained at Yellow. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Nevado del Ruiz | 21 March-27 March 2012 | New Activity / Unrest Cite this Report
Nevado del Ruiz Colombia	According to INGEOMINAS, the Observatorio Vulcanológico and Sismológico de Manizales reported that during 19-25 March seismicity at Nevado del Ruiz increased and gas emissions remained at significant levels. Gas plumes rose 2 km above Arenas crater and sulfur dioxide odors were reported by local people. The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity"). Source: Servicio Geológico Colombiano (SGC)
Pacaya | 21 March-27 March 2012 | New Activity / Unrest Cite this Report
Pacaya South-Central Guatemala	INSIVUMEH noted in a special report that on 20 March patterns of seismicity and emissions from Pacaya's MacKenney cone changed, although remained characteristic of normal behavior for the volcano. On 26 March avalanches were detected and during 26-27 March gas plumes drifted S and SW. The report noted that after the eruption on 27 May 2010 only fumarolic emissions, mainly composed of water vapor, rose from MacKenney cone. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Soufriere Hills | 21 March-27 March 2012 | New Activity / Unrest Cite this Report
Soufriere Hills Montserrat	MVO reported that during 16-23 March activity at the Soufrière Hills lava dome was at a low level, although seismicity increased. Two swarms of volcano-tectonic earthquakes occurred, the first between 1604 and 1651 on 22 March (49 events) and the second between 0310 and 0527 on 23 March (54 events). Earthquakes in the second swarm were markedly larger than those in the first. Several changes on the volcano were observed on 23 March; fumarolic activity had increased and a new fumarole had appeared on the NW face of the lava dome behind Gages Mountain. In addition a vent producing pulsing steam emissions with a small amount of ash had formed in the back of the February 2010 collapse scar. Ash plumes rose 1.8 km (6,000 ft) a.s.l. and very light ashfall occurred on the W flank of the volcano. Audible roaring associated with the venting was heard intermittently from MVO, 5.75 km NW of the volcano. The Hazard Level remained at 2. Based on a METAR weather report and analyses of satellite imagery, the Washington VAAC reported that on 24 March a gas-and-ash plume drifted 65 km WSW. Later that day the VAAC reported a detached area of ash drifting NW and a second small emission of ash drifting WNW. The next day haze and vog W of Soufrière Hills was detected in satellite imagery and a pilot reported ash at altitudes of 1.5-3 km (5,000-10,000 ft) a.s.l. drifting NW. On 26 March MVO noted that activity returned to a low level following the ash-venting on 23 March. The report noted that Zone C on the volcanic risk map, which was temporarily closed the previous week due to an increase in volcano-tectonic earthquakes below Soufrière Hills, re-opened for day-time entrance on 27 March. Zone C is to the WNW of Soufrière Hills and includes Cork Hill, Weekes, Foxes Bay, Richmond Hill, and Delvins, and extends 500 m out to sea. Sources: Washington Volcanic Ash Advisory Center (VAAC), Montserrat Volcano Observatory (MVO)

Aira | 21 March-27 March 2012 | Continuing ActivityCite this Report
Aira Kyushu (Japan)	Based on information from JMA, the Tokyo VAAC reported that during 21-22 March explosions from Sakura-jima produced ash plumes that rose to altitudes of 1.8-2.7 km (6,000-9,000 ft) a.s.l. and drifted NE and S. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Cleveland | 21 March-27 March 2012 | Continuing ActivityCite this Report
Cleveland Chuginadak Island (USA)	AVO reported on 23 March that the Volcano Alert Level and Aviation Color Code for Cleveland were lowered to Advisory and Yellow, respectively, because no explosions had been detected since 13 March and lava-dome growth was not evident after that. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Karymsky | 21 March-27 March 2012 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka (Russia)	KVERT reported that during 16-23 March seismic activity from Karymsky continued to be detected, and indicated that possible ash plumes rose to an altitude of 3 km (9,800 ft) a.s.l. during 17 and 20-21 March. Satellite imagery showed a thermal anomaly on the volcano on 15 and 17 March; cloud cover prevented observations on the other days. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea | 21 March-27 March 2012 | Continuing ActivityCite this Report
Kilauea Hawaiian Islands (USA)	During 21-27 March HVO reported that the lava lake periodically rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Almost daily measurements indicated that the gas plume from the vent continued to deposit variable amounts of ash and fresh spatter nearby. Incandescence was visible from both a small pit on the NE edge and a small spatter cone on the SE edge of the Pu'u 'O'o crater floor, and on the upper part of the lava-tube system on the E flank. Lava flows continued to advance down the pali and across the coastal plain. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Kizimen | 21 March-27 March 2012 | Continuing ActivityCite this Report
Kizimen Eastern Kamchatka (Russia)	KVERT reported moderate seismic activity at Kizimen during 16-23 March and a large thermal anomaly that was detected in satellite images. Video and satellite observations indicated both continued effusion of a large lava flow on the E flank and accompanying hot avalanches. Strong gas-and-steam activity was observed with the video camera. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Puyehue-Cordon Caulle | 21 March-27 March 2012 | Continuing ActivityCite this Report
Puyehue-Cordon Caulle Central Chile	OVDAS-SERNAGEOMIN reported that although cloud cover often prevented satellite and web camera observations of the Cordón Caulle rift zone, part of the Puyehue-Cordón Caulle volcanic complex, during 20-27 March plumes were sometimes observed rising no higher than 1 km above the crater. The Alert Level was lowered to Orange on 23 March. Incandescence from the crater was observed during 23-27 March. Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
Reventador | 21 March-27 March 2012 | Continuing ActivityCite this Report
Reventador Ecuador	IG reported that during 21-25 March storm clouds prevented observations of Reventador. During 25-26 March incandescence from a high part of the volcano was observed. On 26 March a steam emission rose 500 m above the crater. Based on analysis of satellite imagery and seismic data, the Washington VAAC reported that an ash plume drifted 25 km NNW on 26 March. Later that day the ash had dissipated and seismicity decreased. Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Washington Volcanic Ash Advisory Center (VAAC)
Sangay | 21 March-27 March 2012 | Continuing ActivityCite this Report
Sangay Ecuador	According to the Washington VAAC, a pilot observed an ash plume from Sangay on 22 March that rose to an altitude of 8.2 km (27,000 ft) a.s.l. Cloud cover prevented satellite observations. Source: Washington Volcanic Ash Advisory Center (VAAC)
Santa Maria | 21 March-27 March 2012 | Continuing ActivityCite this Report
Santa Maria Southwestern Guatemala	Based on analyses of satellite imagery and reports from INSIVUMEH, the Washington VAAC reported that on 23 March diffuse gas-and-ash plumes from Santa María's Santiaguito lava-dome complex drifted 33 km SW. Ashfall was noted in areas within 18 km of the volcano. On 24 March an ash plume drifted 26 km SW. The next day rockfalls occurred around the summit area and gas-and-ash plumes drifted 28 km SE, S, and SW. A thermal anomaly was detected in satellite imagery at night. INSIVUMEH reported that during 25-27 March explosions generated ash plumes that rose 800-900 m above the crater and drifted in multiple directions. Lava flows continued to produce avalanches that descended the flanks. Ashfall was reported 5 km S at Observatory Vulcanológico de Santiaguito (OVSAN), at the El Faro, La Florida, and Patzulin ranches (SW), and in the village of Santa María de Jesús (SE). On 26 March an explosion was followed by a pyroclastic flow that traveled down the W flank of Caliente Cone. Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Washington Volcanic Ash Advisory Center (VAAC)
Sheveluch | 21 March-27 March 2012 | Continuing ActivityCite this Report
Sheveluch Central Kamchatka (Russia)	KVERT reported that explosive activity at Shiveluch continued during 16-23 March. Ground-based observers and satellite imagery indicated that a viscous lava flow continued to effuse in the crater formed during a 2010 eruption. During 15-21 March ash plumes rose to altitudes of 5-6 km (16,400-19,700 ft) a.s.l. Satellite imagery showed plumes drifting 194 km E and SE during 16-18 March and a weak thermal anomaly on the volcano during 16-18 and 20 March. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Tungurahua | 21 March-27 March 2012 | Continuing ActivityCite this Report
Tungurahua Ecuador	IG reported that, although visual observations of Tungurahua during 21-25 March were occasionally limited due to cloud cover, steam plumes rose 0.5-4 km above the crater and drifted SW, W, NW, and NNE. On 21 March incandescence from the crater was observed and roaring noises were noted. The next day a steam-and-ash plume rose to a low height, and during 22-23 March ashfall was reported in Runtún (6 km NNE). Heavy rain during 24-25 March generated lahars in the Pampas area to the S and caused flooding in the sectors of Puela (8 km SW), Palitahua (S) and Ulba (NNE). Activity increased on 26 March. Roaring was heard in multiple areas. An ash plume rose 3 km above the crater and drifted NNE; ashfall was reported in Ventanas, Cusúa (8 km NW), Pondoa (about 8 km N), Baños (9 km N), San Francisco, and Río Verde. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 19,996 individual reports over 1,215 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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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)