All times are local unless otherwise stated.

Asamayama (Japan) | 18 July-24 July 2018 | New Activity / Unrest Cite this Report
Asamayama Northeast Japan Volcanic Arc	JMA stated that during 16-23 July white plumes rose as high as 300 m above Asamayama’s summit crater. Weak crater incandescence was visible for the first time since 23 December 2017. The Alert Level remained at 2 (on a scale of 1-5). Source: Japan Meteorological Agency (JMA)
Etna (Italy) | 18 July-24 July 2018 | New Activity / Unrest Cite this Report
Etna Sicily Volcanic Province	INGV reported that during 16-22 July gas plumes rose from Etna’s summit crater; low-energy Strombolian activity also occurred from three vents at the bottom of Northeast Crater (NEC) and from two vents in Bocca Nuova. The activity was mostly confined to the craters, with material falling back into the craters, though occasionally incandescent lava was ejected about 100 m above the crater rim. The activity sometimes generated ash emissions that dissipated near the summit. Source: Sezione di Catania - Osservatorio Etneo (INGV)
Krakatau (Indonesia) | 18 July-24 July 2018 | New Activity / Unrest Cite this Report
Krakatau Sunda Volcanic Arc	Based on satellite and wind model data, the Darwin VAAC reported that during 18-20 July ash plumes from Anak Krakatau rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted NE, E, SW, and W. The Alert Level remained at 2 (on a scale of 1-4); residents and visitors were warned not to approach the volcano within 1 km of the crater. Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Nishinoshima (Japan) | 18 July-24 July 2018 | New Activity / Unrest Cite this Report
Nishinoshima Ogasawara Volcanic Arc	Based on Japan Coast Guard (JCG) observations, JMA reported that a very small eruption at Nishinoshima occurred at 1124 on 12 July, producing a brownish plume that rose from near the crater. During an aerial survey, JCG noted deposits 400 m from the vent. No thermal anomalies were detected. The report warned people to stay at least 500 m away from the crater. Source: Japan Meteorological Agency (JMA)
Semeru (Indonesia) | 18 July-24 July 2018 | New Activity / Unrest Cite this Report
Semeru Sunda Volcanic Arc	Based on analysis of satellite images, the Darwin VAAC reported that on 20 July a minor eruption at Semeru generated an ash plume that rose to an altitude of 4.9 km (16,000 ft) a.s.l. and drifted SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Sierra Negra (Ecuador) | 18 July-24 July 2018 | New Activity / Unrest Cite this Report
Sierra Negra Galapagos Hotspot Volcano Group	IG reported that the eruption at Sierra Negra continued through 23 July, and continued to vary in intensity. Four fissures had initially opened on 26 June, at the start of the eruption. Fissure 1 is 4 km long and located at the edge of the caldera in the area of Volcán Chico. Lava flows from this fissure traveled 7 km down the flanks, and 1.7 km within the interior of the caldera, covering an area of 16.1 square kilometers. Fissure 2 is about 250 m long, located NW of the caldera, and produced lava flows that traveled 3 km and covered an area of 2.3 square kilometers. Fissure 3, located W of the caldera, is 250 m long and produced lava flows that descended the flanks 2 km, covering an area of 0.3 square kilometers. Fissures 1-3 were active until 27 June. Fissure 4, 250 m long and located on the NW flank, continued to be active. Lava from this fissure reached the ocean between 9 and 10 July, and by 16 July had covered an area of 11.6 square kilometers (30.4 square kilometers was covered by lava from all four fissures). Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Villarrica (Chile) | 18 July-24 July 2018 | New Activity / Unrest Cite this Report
Villarrica Southern Andean Volcanic Arc	POVI reported that sometime during mid-morning on 18 July webcam images captured two vapor-and-gas emissions with some ash rising from Villarrica. Between 1100 and 1200 that same day a thermal anomaly (the largest since December 2017) was identified in satellite images. Crater incandescence was visible later that day. An earthquake, possibly a volcano-tectonic signal, was detected at about 0627 on 20 July, a few hours after gas-and-steam emissions decreased. Crater incandescence was visible on 23 July. Source: Proyecto Observación Villarrica Internet (POVI)

Agung (Indonesia) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Agung Sunda Volcanic Arc	PVMBG reported that plumes rose 200-500 m above Agung’s crater rim on 18, 20, and 23 July. Gray plumes rose as high as 1.5 km on 22 July. The Alert Level remained at 3 (on a scale of 1-4) and the exclusion zone was stable at a 4-km radius. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Aira (Japan) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Aira Ryukyu Volcanic Arc	JMA reported that at 1336 on 17 July an event at Minamidake crater (at Aira Caldera’s Sakurajima volcano) produced a plume that rose 1.2 km above the crater rim. Sulfur dioxide emissions were 1,300 tons per day that same day. Occasional small events were recorded during 20-23 July, and crater incandescence was visible on 22 and 23 July. The Alert Level remained at 3 (on a 5-level scale). Source: Japan Meteorological Agency (JMA)
Ambae (Vanuatu) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Ambae Vanuatu Volcanic Arc	Based on satellite data, webcam observations, and wind model data, the Wellington VAAC reported that during 17-24 July ash plumes from the vent at Ambae’s Lake Voui rose to altitudes of 2.1-5.5 km (7,000-18,000 ft) a.s.l. and drifted N, NE, E, and SE. According to news articles, activity intensified on 17 July with significant ashfall impacting the N and E parts of the island, causing dark conditions for residents. Rumbling noises were reported at Penama Provincial Headquarters at Saratamata, more than 30 km away. Volcanologists conducting field work in the areas noted widespread damage and disruption to the local population; roads going to the W part of the island had been washed away. Sources: Wellington Volcanic Ash Advisory Center (VAAC), Radio New Zealand, Radio New Zealand
Bagana (Papua New Guinea) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Bagana Solomon Volcanic Arc	Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 22 July an ash plume from Bagana rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted W. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Cleveland (United States) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Cleveland Aleutian Ridge Volcanic Arc	AVO reported that unrest at Cleveland continued during 18-23 July, though nothing significant was detected in seismic or infrasound data. Weakly elevated surface temperatures were identified in satellite images during 18 and 23-24 July; meteorological cloud cover hindered views of the crater on most of the other days. A small deposit of blocks within the summit crater and just below the E crater rim observed only in satellite data suggested the occurrence of a very small explosion undetectable in seismic and pressure sensor data. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Dukono (Indonesia) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Dukono Halmahera Volcanic Arc	Based on PVMBG observations and satellite data, the Darwin VAAC reported that during 18-23 July ash plumes from Dukono rose to an altitude of 1.8 km (6,000 ft) a.s.l. and drifted NW, N, NE, and E. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Ebeko (Russia) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Ebeko Kuril Volcanic Arc	Volcanologists in Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, observed explosions during 13-20 July that sent ash plumes as high as 3.4 km (11,200 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)
Fuego (Guatemala) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Fuego Central America Volcanic Arc	INSIVUMEH reported that during 19-20 and 23-24 July avalanches of material from Fuego’s crater descended the S, SW, and W flanks (Santa Teresa, Las Lajas, El Jute, and Cenizas drainages). Weak explosions during 23-24 July sent low ash plumes N. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Karymsky (Russia) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 13-20 July, along with ash plumes that drifted as far as 500 km W and SW during 14-19 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kerinci (Indonesia) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Kerinci Sunda Volcanic Arc	Based on satellite data, the Darwin VAAC reported that on 22 July an ash plume from Kerinci rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted SW. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Kilauea (United States) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	HVO reported that the eruption at Kilauea’s Lower East Rift Zone (LERZ) and within Halema`uma`u Crater continued during 18-24 July. Lava fountaining and spatter was concentrated at Fissure 8, feeding lava flows that spread through Leilani Estates and Lanipuna Gardens subdivisions, and built out the coastline at multiple ocean entries. Inward slumping of the crater rim and walls of Halema`uma`u continued, adjusting from the withdrawal of magma and subsidence of the summit area. Explosions from collapse events occurred almost daily, often followed by a surge in activity at Fissure 8. Sulfur dioxide emissions from the summit were very low. Fountaining at Fissure 8 continued, producing Pele's hair and other volcanic glass that fell within Leilani Estates. The fountains continued to feed the lava flow that traveled NE, and then SSE, W of Kapoho Crater. Channel overflows on 18 July destroyed structures in the Leilani Subdivision. The channelized ‘a’a flow was incandescent along its entire length as it flowed towards the ocean. It generated plumes of laze (a corrosive steam plume mixed with hydrochloric acid and fine volcanic glass particles) at several points along a broad 6-km-wide flow front, though the main entry area was at Ahalanui, a few hundred meters E of the flow edge which was 175 m NE of Isaac Hale Park (by 24 July). HVO noted that the lava delta was unstable as it has been built out as far as 800 m from the original coastline on unconsolidated lava fragments and sand. Sources: US Geological Survey Hawaiian Volcano Observatory (HVO), Big Island Video News
Pacaya (Guatemala) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Pacaya Central America Volcanic Arc	INSIVUMEH reported that during 19-20 and 23-24 July Strombolian explosions at Pacaya’s Mackenney Crater ejected material as high as 30 m above the crater rim. A 200-m-long lava flow originating from Mackenney Crater was visible on NW flank. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Sabancaya (Peru) | 18 July-24 July 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 explosions at Sabancaya averaged 25 per day during 16-22 July. Hybrid earthquakes were infrequent and low-magnitude. Gas-and-ash plumes rose as high as 2.5 km above the crater rim and drifted 30 km S, SE, and E. The MIROVA system detected one thermal anomaly, and on 18 July the sulfur dioxide gas flux was very high at 12,068 tons/day. The report noted that the public should not approach the crater within a 12-km radius. Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)
Sheveluch (Russia) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that satellite images showed a thermal anomaly over Sheveluch during 13-20 July, and a plume of re-suspended ash drifting 62 km SE on 18 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Turrialba (Costa Rica) | 18 July-24 July 2018 | Continuing ActivityCite this Report
Turrialba Central America Volcanic Arc	OVSICORI-UNA reported increased activity at Turrialba during 23-24 July characterized by small sporadic emissions. A very low and diffuse ash plume rose from the crater on 24 July, causing ashfall in Coronado, Tibás (35 km WSW), Goicoechea (28 km WSW), Moravia (31 km WSW), and other areas in the Valle Central. 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 20,652 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.

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)