All times are local unless otherwise stated.

Aira (Japan) | 28 March-3 April 2018 | New Activity / Unrest Cite this Report
Aira Ryukyu Volcanic Arc	JMA reported that there were 16 events at Minamidake crater (at Aira Caldera’s Sakurajima volcano) during 26 March-2 April, 12 of which were explosive. Tephra was ejected as far as 900 m from the crater. At 1541 on 26 March an explosion generated an ash plume that rose 3.4 km above the crater rim. An explosion recorded at 0740 on 1 April produced an ash plume that rose 3 km. Crater incandescence was visible the morning of 27 March and at night during 30 March-1 April. During 30 March-2 April there were three events at Showa crater. An event at 1611 on 1 April ejected tephra 300-500 m from the crater, and produced a very small pyroclastic flow (the first since 3 June 2016) that traveled 800 m E. A plume rose 1.7 km above the crater rim, up into weather clouds. The previous eruption at Showa crater occurred on 8 January. The Alert Level remained at 3 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Ambae (Vanuatu) | 28 March-3 April 2018 | New Activity / Unrest Cite this Report
Ambae Vanuatu Volcanic Arc	Based on satellite data, webcam and VGO observations, and wind model data, the Wellington VAAC reported that during 28 March-3 April ash plumes from the vent at Ambae’s Lake Voui rose to altitudes of 2.3-6.1 km (8,000-20,000 ft) a.s.l. and drifted in multiple directions. News articles noted that ashfall continued to damage crops and buildings, and contaminate water. Sources: Wellington Volcanic Ash Advisory Center (VAAC), Radio New Zealand
Dieng Volcanic Complex (Indonesia) | 28 March-3 April 2018 | New Activity / Unrest Cite this Report
Dieng Volcanic Complex Sunda Volcanic Arc	PVMBG reported that a phreatic eruption at the Sileri Crater lake (Dieng Volcanic Complex) occurred at 1342 on 1 April, ejecting mud and material 150 m high, and up to 200 m in multiple directions. The event was preceded by black emissions that rose 90 m, and then diffuse white emissions that rose 150 m. The report noted that there were not many tourists in the area due to rainy weather; tourists are not permitted within 200 m of the crater rim. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Kikai (Japan) | 28 March-3 April 2018 | New Activity / Unrest Cite this Report
Kikai Ryukyu Volcanic Arc	JMA reported that the number of volcanic earthquakes at Satsuma Iwo-jima, a subaerial part of Kikai’s NW caldera rim, was low during 27 March-2 April after an increase recorded during 22-23 March. White plumes rose as high as 1.8 km above the Iwo-dake lava dome. Incandescence from the crater was visible at night during 27-28 March. The Alert Level remained at 2 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Kirishimayama (Japan) | 28 March-3 April 2018 | New Activity / Unrest Cite this Report
Kirishimayama Ryukyu Volcanic Arc	Based on observations during overflights on 28 March and 2 April, JMA reported that the crack on the W flank of Shinmoedake (Shinmoe peak), a stratovolcano of the Kirishimayama volcano group, continued to widen. White emissions rose as high as 500 m above the crater rim. Several high-temperature regions around the margins of the lava in the crater, and from the flow on the NW flank, were detected on 28 March. The lava flow on the NW flank advanced 85 m from 9-29 March. Sulfur dioxide emissions were 300 tons/day on 30 March. The number of volcanic earthquakes began to decline after 26 March; though from 0014 to 1430 on 3 April the number increased to 239. Many low-frequency earthquakes with shallow hypocenters continued to be recorded. The Alert Level remained at 3 (on a scale of 1-5). Source: Japan Meteorological Agency (JMA)
Piton de la Fournaise (France) | 28 March-3 April 2018 | New Activity / Unrest Cite this Report
Piton de la Fournaise Reunion Hotspot Volcano Group	OVPF reported that intermittent inflation at Piton de la Fournaise had been detected since the end of the last eruption on 28 August 2017. Seismicity began increasing the last two weeks in February. Seismicity fluctuated during March; peaks were recorded on 28 and 31 March, with volcano-tectonic earthquakes occurring less than 2 km below the summit area. An enrichment of carbon dioxide and sulfur dioxide in summit fumaroles was noted on 23 March. A seismic crisis began at 0300 on 3 April, and along with deformation, indicted magma migration towards the surface. An eruption began at 1040 on the N flank, just below the rampart at the Nez Coupé de Sainte Rose area. During an overflight, scientist observed a 1-km-long fissure, divided in seven segments, with two active vents producing lava fountains. At 1600 many landslides were recorded by the seismic network in the active area. The eruption ended At 0400 on 4 April, though a few landslides were recorded through 1530. Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)

Dukono (Indonesia) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that during 28 and 30 March and 1-3 April ash plumes from Dukono rose to altitudes of 1.5-2.1 km (5,000-7,000 ft) a.s.l. and drifted ENE, E, and ESE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Ebeko (Russia) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Ebeko Kuril Volcanic Arc	Based on observations by volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions during 23-25 and 28-29 March generated ash plumes that rose as high as 2.3 km (7,500 ft) a.s.l. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Karymsky (Russia) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 23-26 March. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	During 28 March-3 April HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Surface lava flows were active above Pulama pali. Webcams recorded spattering from a small lava pond in a pit on the W side of Pu'u 'O'o Crater. The lava flow from a vent on the SE part of the crater floor continued to expand. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Mayon (Philippines) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Mayon Eastern Philippine Volcanic Arc	On 29 March PHIVOLCS lowered the Alert Level for Mayon to 2 (on a 0-5 scale) noting a deflationary trend since 20 February, decreased seismicity, a lower sulfur dioxide flux, and decreased surficial activity. During the previous two weeks the number of rockfalls from collapse of unstable lava-flow deposits fell from a peak of 82 to less than 10 per day. Sulfur dioxide flux ranged from 500 to 2,000 tonnes/day during the previous two weeks, lower than 700-4,500 tonnes/day during 13 January-8 March. Lava last effused from the crater on 18 March, and crater incandescence from hot gas emissions had become faint. Fewer rockfalls and pyroclastic flows were noted as the lava flows stabilized; at 0934 on 27 March one pyroclastic flow traveled down the Bonga-Buyuan drainage and produced a dirty-white ash cloud that drifted SW. During 30 March-3 April a few rockfalls were recorded, there was faint crater incandescence, and steam plumes drifted SW, WNW, and NW. PHIVOLCS reminded residents to stay away from the 6-km-radius Permanent Danger Zone. Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Sabancaya (Peru) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Sabancaya Central Andean Volcanic Arc	Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya was similar compared to the previous week; explosions averaged 18 per day during 26 March-1 April. Seismicity was dominated by long-period events, with signals indicating emissions. Gas-and-ash plumes rose as high as 4.7 km above the crater rim and drifted 50 km SW and NW. The sulfur dioxide flux was high, at 2,855 tons per day on 30 March. The MIROVA system detected six thermal anomalies. On 28 March a lahar which began at 1113 descended the SE flank towards the Sallalli river. The report noted that the public should not to approach the crater within a 12-km radius. Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)
Sheveluch (Russia) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that a weak thermal anomaly over Sheveluch was identified in satellite images during 23-30 March. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Suwanosejima (Japan) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Suwanosejima Ryukyu Volcanic Arc	Based on JMA notices and satellite data, the Tokyo VAAC reported that during 28-30 March and 2 April explosions at Suwanosejima produced plumes that rose 1.2-2.7 km (4,000-9,000 ft) a.s.l. and drifted NE, NW, W, SW, and S. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Turrialba (Costa Rica) | 28 March-3 April 2018 | Continuing ActivityCite this Report
Turrialba Central America Volcanic Arc	OVSICORI-UNA reported that events at Turrialba at 1802 on 31 March and 0838 on 1 April generated plumes that rose 400 and 500 m above the crater rim, and drifted SW and NW, respectively. An event at 0700 on 3 April produced an ash plume that rose 500 m and went NW; passive ash emissions followed. Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,627 individual reports over 1,243 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.

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)