All times are local unless otherwise stated.

Cleveland | 1 May-7 May 2013 | New Activity / Unrest Cite this Report
Cleveland Unknown	AVO reported that on 4 May the infrasound network detected three short-duration explosions from Cleveland at 0500, 0717, and 1144. A small, low-altitude ash cloud along with high surface temperatures at the summit were observed in satellite images starting at 0717. In a report posted at 1822 AVO noted that both webcam and satellite images suggested continuous low-level emissions of gas, steam, and minor amounts of ash over the past several hours with a faint plume drifting E below 4.6 km (15,000 ft) a.s.l. The Volcanic Alert Level was raised to Watch and the Aviation Color Code was raised to Orange. On 5 May the amplitude of the Cleveland infrasonic tremor, as measured by the ground-coupled airwaves on the Okmok seismic network, 120 km NE, decreased from its peak activity the evening before. Satellite images again detected continuous low-level emissions of gas, steam, and minor amounts of ash producing a faint plume that drifted E below 4.6 km (15,000 ft) a.s.l. Explosions were detected at 1123 on 5 May and 0800 on 6 May. A thermal anomaly continued to be detected. A news article stated that some airplanes were diverted away from Cleveland. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Heard | 1 May-7 May 2013 | New Activity / Unrest Cite this Report
Heard Unknown	According to NASA Earth Observatory (EO) an image acquired on 7 April from the Advanced Land Imager (ALI) on NASA's EO-1 satellite showed that Mawson's Peak crater on Heard Island had filled and a lava flow had traveled down the SW flank. The lava flow was visible in an image acquired on 20 April and had slightly widened just below the summit. Source: NASA Earth Observatory
Mayon | 1 May-7 May 2013 | New Activity / Unrest Cite this Report
Mayon Unknown	PHIVOLCS reported that a small phreatic eruption from Mayon occurred at 0800 on 7 May and lasted for 2 minutes and 26 seconds. A gray-to-brown ash cloud rose 500 m above the crater and drifted WSW. Ash fell in areas WNW, affecting the barangays of Muladbucad (10 km WSW), Guinobatan (11 km SW), Nabonton (10 km W), Nasisi (11 km W), Basag (10 km W), Tambo, Ligao City (19 km WSW), Albay (19 km SW), and areas upslope of these barangays. One rockfall was detected. Seismicity and gas emissions remained within background levels and indicated no intensification of activity. The Alert Level remained at 0 and the public was reminded not to enter the 6-km-radius Permanent Danger Zone (PDZ). According to a news article, the eruption ejected large "room-sized rocks" towards about 30 climbers, killing five and injuring eight. Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Papandayan | 1 May-7 May 2013 | New Activity / Unrest Cite this Report
Papandayan Unknown	CVGHM reported that during 1 April-5 May soil temperatures around Papandayan's crater fluctuated but increased overall. During 1-5 May seismicity increased, prompting CVGHM to raise the Alert level to 3 (on a scale of 1-4) on 5 May. Tourists and residents were reminded not to venture within 2 km of the active crater. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Tungurahua | 1 May-7 May 2013 | New Activity / Unrest Cite this Report
Tungurahua Unknown	IG reported that although cloud cover often prevented observations of Tungurahua during 1-7 May ash plumes were observed almost daily. Seismicity remained at a moderate level, although it increased on 4 May. On 1 May an explosion and rolling blocks were heard, and ashfall was reported in El Manzano (8 km SW). The next day steam-and-ash plumes rose 1-1.5 km above the crater and drifted W. Ashfall was reported in Cevallos (23 km NW), Tisaleo (29 km NW), Quero (20 km NW), and Mocha (25 km WNW). During 2-4 May Strombolian activity was observed at night. On 3 May several explosions produced ash plumes that rose 2-3 km above the crater and drifted N and NW. Ash fell in Juive (7 km NNW), Runtún (6 km NNE), Pondoa 8 km N), Baños (8 km N), Patate (NW), Pelileo (8 km N), Ambato (31 km NW), Cevallos, and at the Tungurahua Observatory (OVT) in Guadalupe (14 km N). On 4 May explosions rattled windows in Baños, and ash plumes rose 1-1.5 km and drifted N and NW. Large lahars traveled down the La Pampa drainage on the S flank, while other lahars traveled down the Vazcún, Juive, and Mandur drainages on the N and NW flanks. Explosions on 5 May rattled windows in Ventanas, Pondoa, and Runtún. An ash plume rose 2 km and drifted W. Ashfall was again reported in Cevallos, Tisaleo, Quero, and Mocha. A pyroclastic flow descended the NW flank 2 km. On 6 May ash plumes drifted SW and ashfall was reported in Cevallos, Tisaleo, Quero, Mocha, Pillate (8 km W), Choglontus (SW), and El Manzano. The next day ash plumes rose 3 km and drifted SW. Ashfall was reported in Sabañag (15 km WNW), Chazo, Ilapo, and Riobamba (30 km S). Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Aira | 1 May-7 May 2013 | Continuing ActivityCite this Report
Aira Unknown	Based on information from JMA, the Tokyo VAAC reported that during 1-6 April explosions from Sakura-jima generated ash plumes that rose to altitudes of 1.8-3 km (6,000-10,000 ft) a.s.l. and drifted E and SE. A pilot observed an ash plume that rose to an altitude of 2.4 km (8,000 ft) a.s.l. on 3 April. Another ash plume observed by a pilot rose to an altitude of 3.4 km (11,000 ft) a.s.l. and drifted S on 5 May. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Bagana | 1 May-7 May 2013 | Continuing ActivityCite this Report
Bagana Unknown	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 5-6 May ash plumes from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 75-85 km W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Batu Tara | 1 May-7 May 2013 | Continuing ActivityCite this Report
Batu Tara Unknown	Based on analyses of satellite imagery and wind data, the Darwin Volcanic Ash Advisory Centre (VAAC) reported that during 1 and 6-7 May ash plumes from Batu Tara rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 45-55 km NW and W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Karymsky | 1 May-7 May 2013 | Continuing ActivityCite this Report
Karymsky Unknown	KVERT reported that satellite data showed a thermal anomaly on Karymsky on 26 April. Two streaks of ash deposits near the volcano were observed during 1-2 May: about 15 km to the W and about 30 km to the NW of the volcano. Technical problems prevented seismic data collection during 26 April-3 May. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea | 1 May-7 May 2013 | Continuing ActivityCite this Report
Kilauea Unknown	During 1-7 May HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. 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 three spatter cones and a small lava pond on the E part of the crater floor. Small lava flows issued from the N spatter cone on 1 May and from the SW cone on 2 May. The lava pond overflowed during 3-4 and 6-7 May. Peace Day activity, fed by lava tubes extending from Pu'u 'O'o, consisted of lava flows active above the pali SE of Pu'u 'O'o, on the pali, and on the coastal plain. Lava also entered the ocean in at least two locations spanning the National Park boundary. On 3 May a breakout on the top of the pali produced a lava flow that traveled down to the coastal plain in about 1 hour. Branches from the flow advanced during 4-6 May. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Kizimen | 1 May-7 May 2013 | Continuing ActivityCite this Report
Kizimen Unknown	KVERT reported that during 26 May-3 April 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)
Paluweh | 1 May-7 May 2013 | Continuing ActivityCite this Report
Paluweh Unknown	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 4-5 May ash plumes from Paluweh rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 45-55 km SW and W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Reventador | 1 May-7 May 2013 | Continuing ActivityCite this Report
Reventador Unknown	According to the Washington VAAC, IG reported that on 1 May seismicity at Reventador was elevated, and an ash plume rose to an altitude of 7 km (23,000 ft) a.s.l. A thermal anomaly was visible in satellite images. On 2 May ash was not identified in images and seismicity decreased. Source: Washington Volcanic Ash Advisory Center (VAAC)
Sheveluch | 1 May-7 May 2013 | Continuing ActivityCite this Report
Sheveluch Unknown	Based on visual observations and analyses of satellite data, KVERT reported that during 26 April-3 May a viscous lava flow effused on the NW and NE flanks of Shiveluch's lava dome, accompanied by hot avalanches, incandescence, and fumarolic activity. Satellite imagery showed a daily thermal anomaly on the lava dome. The Aviation Color Code remained at Orange. Based on analyses of satellite imagery and notices from Yelizovo Airport (UHPP), the Tokyo VAAC reported that on 5 May an ash plume rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted E. Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)
Soufriere Hills | 1 May-7 May 2013 | Continuing ActivityCite this Report
Soufriere Hills Unknown	MVO reported that during 26 April-3 May activity at the Soufrière Hills lava dome was at a low level. During 1-2 May the wind direction shifted to the N and NE, blowing the plume over inhabited areas where residents occasionally reported volcanic-gas odors. The Hazard Level remained at 2 (on a scale of 1-5). Source: Montserrat Volcano Observatory (MVO)
Tolbachik | 1 May-7 May 2013 | Continuing ActivityCite this Report
Tolbachik Unknown	KVERT reported that the S fissure along the W side of Tolbachinsky Dol, a lava plateau on the SW side of Tolbachik, continued to produce very fluid lava flows during 26 April-3 May that traveled to the W, S, and E sides of the plateau. Cinder cones continued to grow along the S fissure and gas-and-ash plumes were observed. A large thermal anomaly on the N part of Tolbachinsky Dol was visible daily in satellite imagery. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,140 individual reports over 1,221 weeks (average of 16 per week) on 334 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)