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 7 June-13 June 2017
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Bogoslof	United States	Aleutian Ridge Volcanic Arc	—	New
Karymsky	Russia	Eastern Kamchatka Volcanic Arc	—	New
Pavlof	United States	Aleutian Ridge Volcanic Arc	—	New
Rincon de la Vieja	Costa Rica	Central America Volcanic Arc	2021 Jun 28	New
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	New
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Asamayama	Japan	Northeast Japan Volcanic Arc	—	Continuing
Bagana	Papua New Guinea	Solomon Volcanic Arc	2000 Feb 28 (in or before)	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
Fuego	Guatemala	Central America Volcanic Arc	2002 Jan 4	Continuing
Ibu	Indonesia	Halmahera Volcanic Arc	2008 Apr 5	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
Poas	Costa Rica	Central America Volcanic Arc	2023 Dec 1	Continuing
Sabancaya	Peru	Andean Central Volcanic Arc	2016 Nov 6	Continuing
Sinabung	Indonesia	Sunda Volcanic Arc	—	Continuing
Turrialba	Costa Rica	Central America Volcanic Arc	—	Continuing

All times are local unless otherwise stated.

Bogoslof (United States) | 7 June-13 June 2017 | New Activity / Unrest Cite this Report

Bogoslof
Aleutian Ridge Volcanic Arc

AVO reported that a new lava dome at Bogoslof breached the surface of the ocean on or around 6 June, and was the first observation of lava at the surface since the start of the eruption that began in mid-December 2016. The dome was an estimated 110 m in diameter on 7 June, and then grew to 160 m in diameter by 9 June.

An explosive eruption began at 0318 on 10 June with a series of short infrasound signals which then, starting at about 0416, transitioned into several minutes-long continuous seismic and infrasound tremor signals. The events generated an ash-rich cloud that rose to an estimated altitude of 10.4 km (34,000 ft) a.s.l. and drifted NW. The Aviation Color Code (ACC) was raised to Red and the Volcano Alert Level (VAL) was raised to Warning. The eruption ended at 0528. Satellite data indicated that at least part of the volcanic cloud was more ash-rich than most in the current eruption period. On 11 June AVO noted no detectable activity in seismic or infrasound data after the event the day before. The ACC was lowered to Orange and the VAL was lowered to Watch. Satellite image acquired on 10 June and a photograph from an observer aboard a jet aircraft on 11 June suggested that the lava dome was no longer above the surface of the water, and was destroyed during the 10 June event.

A series of explosive events, each lasting 10-30 minutes, began at 1747 on 12 June and ended around 2035. Ash plumes rose 7.6 km (25,000 ft) a.s.l. and drifted SE. The ACC was raised to Red and the VAL was raised to Warning. At 0817 on 13 June a six-minute-long explosion was detected in seismic and infrasound data. A plume was not observed, likely because it was too small or below detection limits. The ACC was lowered to Orange and the VAL was lowered to Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Karymsky (Russia) | 7 June-13 June 2017 | New Activity / Unrest Cite this Report

Karymsky
Eastern Kamchatka Volcanic Arc

KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 3-8 June. Explosions on 8 June generated ash plumes that rose 2-3 km (6,600-9,800 km) a.s.l. and drifted 70 km E, SE, and SW. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Pavlof (United States) | 7 June-13 June 2017 | New Activity / Unrest Cite this Report

Pavlof
Aleutian Ridge Volcanic Arc

On 7 June AVO reported that during the past several days an increase in low-frequency earthquake activity was detected at Pavlof. This kind of activity can sometime precede eruptive episodes. In addition, several short-duration tremor bursts were observed, and a pilot reported a possible ash cloud to 1.2 km (4,000 ft) a.s.l. Infrasound data from instruments on the volcano and from a more distant network in Sand Point showed no evidence of significant explosive activity. AVO noted that since activity prior to eruptions of Pavlof had always been very subtle, they increased the Aviation Color Code to Yellow and the Alert Level to Advisory based on these observations. During 8-9 June gas emissions from the summit were observed in web camera images and by local observers in Cold Bay (60 km SW). AVO noted that vapor emissions (with or without minor amounts of volcanic ash) are common and may occur from the summit vent at any time.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Rincon de la Vieja (Costa Rica) | 7 June-13 June 2017 | New Activity / Unrest Cite this Report

Rincon de la Vieja
Central America Volcanic Arc

OVSICORI-UNA reported that a small, minute-long, phreatic eruption in Rincón de la Vieja's crater lake began at 0542 on 11 June. Poor visibility prevented visual confirmation of plume details, though the Washington VAAC reported that a thermal anomaly was present in satellite images. A small seismic signal that lasted less than one minute was recorded at 2106 on 12 June. The signal possibly represented an emission, though it was not confirmed.

Sources: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA), Washington Volcanic Ash Advisory Center (VAAC)

Sheveluch (Russia) | 7 June-13 June 2017 | New Activity / Unrest Cite this Report

Sheveluch
Eastern Kamchatka Volcanic Arc

KVERT reported that during 3, 5, and 7-8 June powerful explosions at Sheveluch generated ash plumes that rose as high as 8 km (26,200 ft) a.s.l. and drifted 1,554 km SW, S, and SE. Pyroclastic flows traveled 10 km. Ashfall was reported in Klyuchi Village (50 km SW) on 8 June. A thermal anomaly was identified daily in satellite images. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Aira (Japan) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

JMA reported four events at Showa Crater (at Aira Caldera’s Sakurajima volcano) during 5-12 June, one of which was explosive. Material was ejected 800 m away the crater rim. Ash plumes rose as high as 3.2 km on 6 June and 1.9 km on 10 June. A very small event occurred at Minamidake summit crater on 5 June. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Asamayama (Japan) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Asamayama
Northeast Japan Volcanic Arc

JMA stated that activity at Asama had been progressively increasing. During 2-5 June a plume rose less than 400 m above the active crater. Weak incandescence from the summit crater was recorded at night with a webcam. Sulfur dioxide flux was a little higher than 900 tons per day when measured on 2 June. The Alert Level remained at 2 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Bagana (Papua New Guinea) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Bagana
Solomon Volcanic Arc

Based on analyses of satellite imagery and model data, the Darwin VAAC reported that during 7-8 and 14 June ash plumes from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 65 km SW, W, and NW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Cleveland (United States) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Cleveland
Aleutian Ridge Volcanic Arc

AVO reported that on 6 June small low-frequency earthquakes at Cleveland were recorded by the seismic network. Elevated surface temperatures identified in satellite images during 6-7 June were consistent with lava effusion at the summit crater. No volcanic activity was detected in seismic, infrasound, or cloudy satellite images during 8-13 June, though AVO noted that lava effusion may have been occurring. A thermal anomaly was identified in satellite images during 12-13 June. 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) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 7-14 June ash plumes from Dukono rose to altitudes of 1.8-2.1 km (6,000-7,000 ft) a.s.l. and drifted in multiple directions. Ash plumes drifted as far as 140 km E on 7 June.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Ebeko (Russia) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Ebeko
Kuril Volcanic Arc

Based on observations by residents of Severo-Kurilsk (Paramushir Island) about 7 km E of Ebeko, KVERT reported that explosive activity continued at the volcano during 2-9 June. 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) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Fuego
Central America Volcanic Arc

INSIVUMEH reported that during 8-9 June explosions at Fuego generated ash plumes that rose as high as 1.1 km above the crater rim and drifted 15 km W, NW, and N. Rumbling was noted, and block avalanches descended multiple ravines. Lahars traveled down several ravines on the SE, S, and SW flanks, especially down the Pantaleón (W) ravine. On 10 June at 1150 a lahar descended the Ceniza (SSW) drainage, carrying blocks 1 m in diameter. The lahar was 15-18 m wide and as deep as 3 m. During 10-11 June explosions produced ash plumes that rose 750-1,050 m and drifted 12-15 km W, NW, and N. Shock waves from some of the explosions were detected. Two hot lahars descended the flanks on 13 June. The first one traveled down the Pantaleón river and was 35 m wide and 2.5-3 m deep, and carried trees and blocks 2-3 m in diameter. The second lahar descended the Ceniza and was 25 m wide and 3 m deep, and carried blocks up to 2 m in diameter.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Ibu (Indonesia) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Ibu
Halmahera Volcanic Arc

Based on PVMBG observations, webcam and satellite images, and wind data, the Darwin VAAC reported that during 9-12 and 14 June ash plumes from Ibu rose 1.5-1.8 km (4,800-6,000 ft) a.s.l. and drifted N, W, and SSW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Kilauea (United States) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

During 7-13 June HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. Webcams recorded incandescence from long-active sources within Pu'u 'O'o Crater, from a vent high on the NE flank of the cone, and from a small lava pond (which had many small spattering sites along the margin) in a pit on the W side of the crater. The 61G lava flow, originating from a vent on Pu'u 'O'o Crater's E flank, continued to enter the ocean at Kamokuna. Field observations on 31 May revealed that the lava delta had grown to an area of approximately 0.01 square kilometers. A solidified lava ramp extended from the tube exit high on the sea cliff down to the delta, whose leading edge was about 100 m from the tube exit on the sea cliff.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Klyuchevskoy (Russia) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Klyuchevskoy
Eastern Kamchatka Volcanic Arc

KVERT reported that during 2-9 June explosions at Klyuchevskoy generated ash plumes that rose to 5 km (16,400 ft) a.s.l. and drifted about 325 km NE, SE, and SW. A weak thermal anomaly was identified in satellite images on 4 and 8 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) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Langila
Bismarck Volcanic Arc

Based on analyses of satellite imagery and wind model data, the Darwin VAAC reported that on 7 June ash plumes from Langila rose 2.1 km (7,000 ft) a.s.l. and drifted over 45 km NW. On 14 June ash plumes rose 1.8 km (6,000 ft) a.s.l. and drifted WNW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Poas (Costa Rica) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Poas
Central America Volcanic Arc

OVSICORI-UNA reported that during 7-13 June seismicity at Poás was characterized by low-amplitude tremor, discrete volcano-tectonic events, low-frequency events, and some periods of small long-period events with low amplitude. During 7-8 June the webcam recorded strong emissions of water vapor, magmatic gases, and particulates. A sulfur odor was reported in Alajuela, San Ramon, and Barva, and incandescence in the area of the crater was recorded at night. OVSICORI-UNA noted that during 8-9 June a plume of water vapor, magmatic gases, and particulates rose from two vents; the lake had evaporated and exposed the vents. A minor sulfur odor was reported on the campus of the Universidad Nacional in Heredia. Events at 1610 and 1750 on 11 June generated plumes that rose 300 and 600 m above the crater, respectively. Plumes from the vents rose 1 km during 12-13 June. A sulfur odor was noted in Quesada, Santa Ana, San José de Alajuela, and San Juanillo Naranjo.

Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Sabancaya (Peru) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Sabancaya
Andean Central Volcanic Arc

Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya slightly decreased from the previous week; there was an average of 31 explosions recorded per day during 5-11 June. The number and magnitude of long-period and hybrid events were moderate and low, respectively. Levels of long-period events were moderate and hybrid events were low. Gas-and-ash plumes rose as high as 2.8 km above the crater rim and drifted more than 30 km E and SE. The MIROVA system detected four thermal anomalies, spread over the SE, N, and NW flanks. Sulfur dioxide flux was as high as 3,392 tons per day on 6 June.

Sources: Instituto Geológico Minero y Metalúrgico (INGEMMET), Instituto Geofísico del Perú (IGP)

Sinabung (Indonesia) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Sinabung
Sunda Volcanic Arc

Based on PVMBG observations, webcam and satellite images, and wind data, the Darwin VAAC reported that during 12-14 June ash plumes from Sinabung rose 3.4-5.5 km (11,000-18,000 ft) a.s.l. and drifted W and S.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Turrialba (Costa Rica) | 7 June-13 June 2017 | Continuing ActivityCite this Report

Turrialba
Central America Volcanic Arc

OVSICORI-UNA reported that tremor amplitude at Turrialba fluctuated from low to medium levels during 7-13 June. Periods of small volcano-tectonic events and many small-amplitude long-period events were also recorded. Plumes of gas and water vapor rose as high as 1 km above the vent and drifted mainly NW, W, and SW.

Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

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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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