Smithsonian / USGS Weekly Volcanic Activity Report

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 6 June-12 June 2018
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Fuego	Guatemala	Central America Volcanic Arc	2002 Jan 4	New
Great Sitkin	United States	Aleutian Ridge Volcanic Arc	2021 May 25	New
Ibu	Indonesia	Halmahera Volcanic Arc	2008 Apr 5	New
Kerinci	Indonesia	Sunda Volcanic Arc	—	New
Manam	Papua New Guinea	Bismarck Volcanic Arc	2014 Jun 29	New
Ruapehu	New Zealand	Taupo Volcanic Zone	—	New
Sierra Negra	Ecuador	Galapagos Hotspot Volcano Group	—	New
Ulawun	Papua New Guinea	Bismarck Volcanic Arc	—	New
Agung	Indonesia	Sunda Volcanic Arc	—	Continuing
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Ambae	Vanuatu	Vanuatu Volcanic Arc	—	Continuing
Ambrym	Vanuatu	Vanuatu Volcanic Arc	—	Continuing
Cleveland	United States	Aleutian Ridge Volcanic Arc	—	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Ebeko	Russia	Kuril Volcanic Arc	2022 Jun 11	Continuing
Kadovar	Papua New Guinea	Bismarck Volcanic Arc	—	Continuing
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	—	Continuing
Klyuchevskoy	Russia	Eastern Kamchatka Volcanic Arc	—	Continuing
Langila	Papua New Guinea	Bismarck Volcanic Arc	2015 Oct 22 (?)	Continuing
Pacaya	Guatemala	Central America Volcanic Arc	—	Continuing
Popocatepetl	Mexico	Trans-Mexican Volcanic Belt	2005 Jan 9	Continuing
Sangay	Ecuador	Andean Northern Volcanic Arc	2019 Mar 26	Continuing
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	Continuing

All times are local unless otherwise stated.

Fuego (Guatemala) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Fuego
Central America Volcanic Arc

During 6-12 June INSIVUMEH and CONRED reported that strong lahars at Fuego were often hot, steaming, and had a sulfur odor, and were generated from heavy rains and the recent accumulation of pyroclastic-flow deposits from the 3 June events. On 6 June lahars descended the Santa Teresa, Mineral, and Taniluyá drainages (tributaries of the Pantaleón river) and possibly the Honda drainage, halting search-and-rescue efforts. The lahars were 30-40 m wide, 2-5 m deep, and carried blocks (2-3 m in diameter) and tree parts. CONRED noted on 9 June that deposits on roads were being cleaned at a rate of 150 m per day, and that exposed deposits were as hot as 150 degrees Celsius. Significant hot lahars, 40 m wide and 5 m deep, traveled down the Seca, Mineral, Niágara, and Taniluyá drainages, carrying rocks and tree branches. On 10 June a strong lahar traveled down the Seca, Mineral, Niagara, Taniluyá, and Ceniza drainages. It was 35 m wide, 3 m deep, and carried blocks up to 1 m in diameter, tree trunks, and branches. Lahars that traveled down the Seca and Mineral drainages on 11 June were 40 m wide and 3 m deep. Lahars on 12 June were 20-45 m wide and 2-5 m deep, and flowed down the Ceniza and Mineral rivers.

During 6-11 June as many as nine weak explosions per hour produced ash plumes that rose as high as 1.1 km above the crater and drifted 8-15 km W, SW, and S. Avalanches of material descended the Las Lajas and Santa Teresa ravines. Some explosions vibrated local structures. At 0820 on 8 June a pyroclastic flow descended the Las Lajas and El Jute drainages, producing an ash plume that rose as high as 6 km and drifted W and SW. Explosive activity increased during 11-12 June, with dense ash plumes rising 1.3 km and drifting as far as 25 km N and NE. Pyroclastic flows traveled down the Seca drainage. According to CONRED, as of 12 June, the number of people that had died due to the 3 June pyroclastic flows was 110, and 197 more were missing. In addition, 12,578 people had been evacuated.

Sources: Coordinadora Nacional para la Reducción de Desastres (CONRED), Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Great Sitkin (United States) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Great Sitkin
Aleutian Ridge Volcanic Arc

Seismicity at Great Sitkin was elevated during the previous five days, though at 1139 on 10 June a seismic signal indicating a possible short-lived steam explosion prompted AVO to raise the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. No infrasound signal associated with the event was detected, and no volcanic clouds rose about the meteorological cloud deck at 2.4 km (8,000 ft) a.s.l.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Ibu (Indonesia) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Ibu
Halmahera Volcanic Arc

PVMBG reported that at 1206 on 6 June an eruption at Ibu generated an ash plume that rose at least 500 m above the crater rim and drifted N. An event at 1750 on 12 June produced an ash plume that rose 600 m and drifted N. The Alert Level remained at 2 (on a scale of 1-4), and the public was warned to stay at least 2 km away from the active crater, and 3.5 km away on the N side.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Kerinci (Indonesia) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Kerinci
Sunda Volcanic Arc

Based on satellite data, the Darwin VAAC reported that on 10 June an ash plume from Kerinci rose to an altitude of 4 km (13,000 ft) a.s.l. and drifted W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Manam (Papua New Guinea) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Manam
Bismarck Volcanic Arc

Based on a pilot observation, the Darwin VAAC reported that on 10 June an ash plume from Manam rose to an altitude of 1.8 km (6,000 ft) a.s.l. The ash plume was not identifiable in satellite images.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Ruapehu (New Zealand) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Ruapehu
Taupo Volcanic Zone

On 5 June GeoNet reported that a new heating cycle at Ruapehu’s summit Crater Lake began, as indicated by a recent rise in the water temperature. The increasing lake temperature began 29 May, at a rate of about 1°C per day. Volcanic tremor also increased, representing a greater flow of hydrothermal fluids into the lake. Many heating and cooling cycles have occurred in the past; the current cycle does not indicate an unusual sign of unrest. The Volcanic Alert Level remained at 1 (minor volcanic unrest) and the Aviation Color Code remained at Green.

Source: GeoNet

Sierra Negra (Ecuador) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Sierra Negra
Galapagos Hotspot Volcano Group

On 8 June IG reported a continuing high level of seismicity at Sierra Negra, characterized by a larger number and magnitude of earthquakes, indicating magma movement. The number of events per day had been significantly increasing since mid-2016. In the previous 10 days there was an average of 42 local events/day; on 25 May there were 104 events, the largest number of earthquakes per day recorded since 2015. In addition, in a 24-hour period during 7-8 June there were a total of 48 volcano-tectonic events, two long-period events, and three hybrid earthquakes; a M 4.8 long-period earthquake was recorded at 0715 on 8 June. The earthquake epicenters were mainly located on the edges of the crater, in two NE-SW trending lineaments; the first covered the N and W edges of the crater and the second went from the NE part around to the S edge. Data showed very large deformation at the caldera’s center, compared with lower levels of deformation outside of the caldera.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Ulawun (Papua New Guinea) | 6 June-12 June 2018 | New Activity / Unrest Cite this Report

Ulawun
Bismarck Volcanic Arc

According to the Darwin VAAC, a NOTAM (Notice to Airmen) stated that on 8 June an ash plume from Ulawun rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted W.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Agung (Indonesia) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Agung
Sunda Volcanic Arc

PVMBG reported that during 1 May-7 June activity at Agung remained at a relatively high level. Emissions were mostly water vapor, occasionally with ash. In general, tiltmeter and GPS showed long-term deflation since December 2017, though inflation began to be detected the second week of May; deformation analysis indicated that magma continued to accumulate about 3-4 km below the crater. Low- and high-frequency earthquakes also suggested rising magma. Sulfur dioxide flux was 190-203 tons/day, and thermal anomalies in the crater were identified in satellite data. The erupted volume of lava was estimated to be 23 million cubic meters, equivalent to about a third of the total crater volume. At 2214 on 10 June an event generated an ash plume that drifted W at an unspecified altitude. 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) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

JMA reported that there were eight events and five explosions at Minamidake crater (at Aira Caldera’s Sakurajima volcano) during 4-11 June. Crater incandescence was occasionally visible at night. Ash plumes rose up to 2 km above the crater rim, except an event at 1135 on 10 June produced a plume that rose 3.5 km. Tephra was ejected as far as 1.3 km from the crater during 8-11 June. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Ambae (Vanuatu) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Ambae
Vanuatu Volcanic Arc

The Vanuatu Meteorology and Geo-hazards Department reported that activity at Ambae’s Lake Voui decreased in May, and by 7 June had ceased; the Alert Level was lowered to 2 (on a scale of 0-5) and a 2-km-radius exclusion zone was emplaced. Steam and volcanic gas emissions continued, and were reportedly smelled by local residents near the volcano.

Source: Vanuatu Meteorology and Geohazards Department (VMGD)

Ambrym (Vanuatu) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Ambrym
Vanuatu Volcanic Arc

On 7 June the Vanuatu Geohazards Observatory (VGO) reported that the lava lakes in Ambrym’s Benbow and Marum craters continued to be active, and produced sustained and substantial gas-and-steam emissions. The Alert Level remained at 2 (on a scale of 0-5); the report reminded the public to stay outside of the Permanent Danger Zone defined as a 1-km radius from Benbow Crater and a 2.7-km radius from Marum Crater.

Source: Vanuatu Meteorology and Geohazards Department (VMGD)

Cleveland (United States) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Cleveland
Aleutian Ridge Volcanic Arc

AVO reported that low-level unrest at Cleveland continued during 6-12 June. Elevated surface temperatures were identified using satellite data on most days, during times of cloud-free observations. Nothing unusual was observed in seismic or pressure sensor data. Steam emissions were observed during 11-12 June. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Dukono (Indonesia) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

Based on PVMBG observations and satellite data, the Darwin VAAC reported that during 6-12 June ash plumes from Dukono rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted W, NW, N, NE, and E.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Ebeko (Russia) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Ebeko
Kuril Volcanic Arc

KVERT reported that a diffuse ash plume drifting 8 km E of Ebeko was identified in satellite images on 5 June. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Kadovar (Papua New Guinea) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Kadovar
Bismarck Volcanic Arc

According to the Darwin VAAC a pilot observed an ash plume from Kadovar rising to an altitude of 1.2 km (4,000 ft) a.s.l. on 10 June. The ash plume was not identified in satellite data.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Kilauea (United States) | 6 June-12 June 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 at Overlook Crater within Halema`uma`u Crater continued during 7-12 June. 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 where the fast-moving flow entered the ocean in the Kapoho Bay area. Minor lava activity at Fissures 16/18 was occasionally noted.

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; the floor had subsided at least 100 m during the previous few weeks, and by 12 June the lowest point was 300 m below the crater rim. Steam plumes rose from areas in the crater as well as from circumferential cracks adjacent to the crater.

Summit explosions occurred almost daily. Explosions at 1607 and 0244 on 6 and 8 June, respectively, each produced an ash plume that rose 3 km (10,000 ft) a.s.l. An explosion was recorded at 0448 on 9 June. Two explosions, the second larger than the first, were recorded at 0046 and 0443 on 11 June. An ash-poor explosion occurred at 0152 on 12 June. A pattern of an increasing number of earthquakes, an explosion, and then a drop-off of seismicity immediately afterwards had emerged during the past few weeks and continued.

A total of 12 rockfalls in Pu'u 'O'o Crater were recorded between 1031 and 1056 on 8 June, following a M 3.2 earthquake at the summit. A red dust plume was visible around 1050 but dissipated quickly.

Fountaining at Fissue 8 was stable, though by 10 June three closely spaced fountains were active within the 35-m-high spatter cone. The heights of the fountains varied, but rose no higher than 70 m. Pele's hair and other volcanic glass from the fountaining fell within Leilani Estates. The fountains continued to feed the fast-moving lava flow that traveled NE, and then SE around Kapoho Crater, and into the ocean. The width of the channel varied from 100-300 m along its length. Periodic overflows sometimes sent small flows down the sides of the channel. Lava entered the ocean at Kapoho Bay, building a lava delta that by 11 June was just over 100 hectares in area. A plume of laze rose from the entry points. An area of strong thermal upwelling in the ocean around 920 m out from the visible lava-delta front was visible beginning on 7 June, suggesting lava flowing on the ocean floor. According to a news report, the Hawaii County Mayor noted that by 8 June lava flows had destroyed over 600 homes.

Sources: US Geological Survey Hawaiian Volcano Observatory (HVO), USA Today

Klyuchevskoy (Russia) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Klyuchevskoy
Eastern Kamchatka Volcanic Arc

KVERT reported that a thermal anomaly over Klyuchevskoy and a diffuse ash plume drifting 12 km W were identified in satellite images on 6 June. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Langila (Papua New Guinea) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Langila
Bismarck Volcanic Arc

Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 7 June a minor ash emission from Langila rose to an altitude of 3.4 km (11,000 ft) a.s.l., slowly drifted SW, and detached form the summit. On 10 June a discrete event produced an ash plume that rose to 2.1 km (7,000 ft) a.s.l. and dissipated.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Pacaya (Guatemala) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Pacaya
Central America Volcanic Arc

INSIVUMEH and CONRED reported that on 6 June a lava flow emerged from a vent on La Meseta (the Mesa) on Pacaya’s NW flank and traveled 200 m over a period of six hours. Strombolian explosions ejected material as high as 50 m above the crater rim during 7-10 June.

Sources: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH), Coordinadora Nacional para la Reducción de Desastres (CONRED)

Popocatepetl (Mexico) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Popocatepetl
Trans-Mexican Volcanic Belt

CENAPRED reported that each day during 6-12 June there were 19-34 steam-and-gas emissions from Popocatépetl, and nightly crater incandescence. Explosions were detected almost every day: at 2026 on 7 June; 0130 on 8 June; 1756, 1931, and 2358 on 9 June; 1724 on 10 June. An explosion at 0220 on 11 June ejected incandescent fragments. The Alert Level remained at Yellow, Phase Two.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)

Sangay (Ecuador) | 6 June-12 June 2018 | Continuing ActivityCite this Report

Sangay
Andean Northern Volcanic Arc

The Washington VAAC reported that on 8 June a possible discrete ash emission from Sangay rose to an altitude of 5.8 km (19,000 ft) a.s.l. and drifted 28 km WSW before dissipating.

Source: Washington Volcanic Ash Advisory Center (VAAC)

Sheveluch (Russia) | 6 June-12 June 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 5-6 June. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

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Criteria & Disclaimers

Criteria

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.

Disclaimers

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.

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