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 1 July-7 July 2015
Name	Country	Volcanic Province	Eruption Start Date	Report Status
Fuego	Guatemala	Central America Volcanic Arc	2002 Jan 4	New
Hakoneyama	Japan	Izu Volcanic Arc	—	New
Raung	Indonesia	Sunda Volcanic Arc	—	New
Sangeang Api	Indonesia	Sunda Volcanic Arc	—	New
Sirung	Indonesia	Sunda Volcanic Arc	—	New
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Batu Tara	Indonesia	Sunda Volcanic Arc	—	Continuing
Concepcion	Nicaragua	Central America Volcanic Arc	—	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Karymsky	Russia	Eastern Kamchatka Volcanic Arc	2024 Jun 20	Continuing
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	2024 Sep 15	Continuing
Manam	Papua New Guinea	Bismarck Volcanic Arc	2018 May 10 ± 10 days	Continuing
Ontakesan	Japan	Nankai Volcanic Arc	—	Continuing
Popocatepetl	Mexico	Trans-Mexican Volcanic Belt	2005 Jan 9	Continuing
Reventador	Ecuador	Northern Andean Volcanic Arc	2008 Jul 27	Continuing
Santa Maria	Guatemala	Central America Volcanic Arc	1922 Jun 22	Continuing
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	Continuing
Shishaldin	United States	Aleutian Ridge Volcanic Arc	—	Continuing
Sinabung	Indonesia	Sunda Volcanic Arc	—	Continuing
Soputan	Indonesia	Sangihe Volcanic Arc	—	Continuing
Tungurahua	Ecuador	Northern Andean Volcanic Arc	—	Continuing
Ubinas	Peru	Central Andean Volcanic Arc	—	Continuing
Zhupanovsky	Russia	Eastern Kamchatka Volcanic Arc	—	Continuing

All times are local unless otherwise stated.

Fuego (Guatemala) | 1 July-7 July 2015 | New Activity / Unrest Cite this Report

Fuego
Central America Volcanic Arc

Based on INSIVUMEH notices, CONRED reported that for a 30-hour period during 30 June-1 July activity at Fuego was at a high level, characterized by explosions, high-temperature pyroclastic flows (that began on 1 July), and ashfall. Ash plumes rose 4.8 km above the crater and drifted 25 km W and NW, producing ashfall in 22 local communities. The majority of material deposited by pyroclastic flows was in the Las Lajas drainage. Activity decreased later that day. During 4-6 July, INSIVUMEH reported that explosions produced ash plumes that rose as high as 800 m above the crater and drifted 8-10 km SW and W. Incandescent material was ejected 100 m high, and avalanches descended the Santa Teresa and other nearby drainages.

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

Hakoneyama (Japan) | 1 July-7 July 2015 | New Activity / Unrest Cite this Report

Hakoneyama
Izu Volcanic Arc

According to a news article a drone that surveyed the Owakudani hot spring district at Hakoneyama recorded damage to three hot spring supply facilities; an exclusion zone for visitors was in effect due to increased seismic activity and an Alert Level raise to 2 (on a 5-level scale) on 6 May. At 1230 on 30 June a small-scale eruption occurred and the Alert Level was raised to 3. On 1 July a news article noted another small-scale eruption (occurring between 0400 and 0500), and JMA reported that ash deposits were visible with the webcam. During fieldwork on 2 July, scientists confirmed new fumaroles at Owakudani that were vigorously emitting white plumes; the new fumaroles had formed during 29-30 June. White fumarolic plumes continued to be emitted through 5 July.

Sources: Japan Meteorological Agency (JMA), The Japan Times, The Japan Times

Raung (Indonesia) | 1 July-7 July 2015 | New Activity / Unrest Cite this Report

Raung
Sunda Volcanic Arc

Based on notices from the Ujung Padang MWO and PVMBG, satellite images, and pilot observations, the Darwin VAAC reported that during 1 and 3-7 July ash plumes from Raung rose to altitudes of 3.7-6.1 km (12,000-20,000 ft) a.s.l. and drifted 25-110 km E, ESE, and SE. According to news articles, flights in and out of an airport in Bali were cancelled due to ash emissions during 3-4 July. On 5 July BNPB reported that roaring was heard from continuous explosions and Strombolian activity at Raung. Dense white-and-gray plumes rose as high as 400 m and drifted SE. The Alert Level remained at 3 (on a scale of 1-4), and the public was reminded not to approach the crater within a 3-km radius.

Sources: Badan Nacional Penanggulangan Bencana (BNPB), Darwin Volcanic Ash Advisory Centre (VAAC), WA Today

Sangeang Api (Indonesia) | 1 July-7 July 2015 | New Activity / Unrest Cite this Report

Sangeang Api
Sunda Volcanic Arc

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 7 July an ash plume from Sangeang Api rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted over 35 km E.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Sirung (Indonesia) | 1 July-7 July 2015 | New Activity / Unrest Cite this Report

Sirung
Sunda Volcanic Arc

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 7 July an ash plume from Sirung rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted 85 km SW.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Aira (Japan) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

JMA reported 14 explosions during 29 June-6 July from Showa Crater at Aira Caldera’s Sakurajima volcano, some that ejected tephra as far as 1,300 m, and incandescence from the crater that was occasionally visible. The Alert Level remained at 3 (on a 5-level scale).

Source: Japan Meteorological Agency (JMA)

Batu Tara (Indonesia) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Batu Tara
Sunda Volcanic Arc

During 30 June-4 July observers at Batu Tara noted Strombolian eruptions of varying intensity at intervals ranging between 10 and 50 minutes. Three pyroclastic flows traveled as far as 200 m over the sea during a 16-hour period of elevated activity between 2 and 3 July.

Source: Volcano Discovery

Concepcion (Nicaragua) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Concepcion
Central America Volcanic Arc

INETER reported that gas explosions continued to be detected at Concepción; by 7 July a total of 2,417 explosions, 117 since 30 June, had been detected by the network since activity increased (date not specified).

Source: Instituto Nicaragüense de Estudios Territoriales (INETER)

Dukono (Indonesia) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

PVMBG reported that during May-June white-and-gray plumes rose as high as 1.2 km above Dukono's Malupang Warirang Crater rim and were accompanied by rumbling and roaring. A powerful explosion on 23 May was followed by minor ashfall in areas to the E. During 1-5 July white-and-gray plumes rose as high as 600 m; minor ashfall was reported in northern areas on 1 July. The Alert Level remained at 2 (on a scale of 1-4). Residents and tourists were advised not to approach the crater within a radius of 2 km.

Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 31 June-3 July ash plumes rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 25-165 km NE. On 7 July ash plumes rose to an altitude of 1.8 km (6,000 ft) a.s.l. and drifted 45 km NE.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)

Karymsky (Russia) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Karymsky
Eastern Kamchatka Volcanic Arc

KVERT reported that explosive activity at Karymsky likely continued during 26 June-3 July; a small ash cloud above the volcano was visible in satellite images on 1 July. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Kilauea (United States) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

HVO reported that seismicity beneath Kilauea's summit, upper East Rift Zone, and Southwest Rift Zone was at background levels during 1-7 July. The lava lake continued to be active in the deep pit within the Overlook vent, vigorously spattering. On 1 July part of the rim and wall of Overlook crater collapsed into the lava lake, starting at about 1430, producing an ashy plume, rapid oscillation of the lava lake, and intense spattering in the lake at the impact site. The June 27th NE-trending lava flow continued to be active with surface flows within 8 km NE of Pu'u 'O'o Crater. Webcams recorded multiple incandescent outgassing vents within Pu'u 'O'o.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)

Manam (Papua New Guinea) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Manam
Bismarck Volcanic Arc

Based on observations of satellite imagery and wind data analyses, the Darwin VAAC reported that during 1-2 July ash plumes from Manam rose to altitudes of 2.4-3 km (8,000-10,000 ft) a.s.l. and drifted 45-130 km E and SE.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Ontakesan (Japan) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Ontakesan
Nankai Volcanic Arc

JMA reported that activity at Ontakesan continued to decline during 26 June-3 July, although the volcano continued to be seismically active and emit white plumes to less than 1 km high. The Alert Level was lowered to 2 (on a scale of 1-5).

Source: Japan Meteorological Agency (JMA)

Popocatepetl (Mexico) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Popocatepetl
Trans-Mexican Volcanic Belt

CENAPRED reported that during 1-7 July the seismic network at Popocatépetl recorded 18-118 daily emissions consisting of water vapor, gas, with ash seen on 7 July only; cloud cover often prevented visual observations. Gas-and-steam plumes were observed daily, and variable nighttime crater incandescence was observed. An explosion was detected at 1024 on 1 July, and 14 were detected during 5-7 July. The Alert Level remained at Yellow, Phase Two.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)

Reventador (Ecuador) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Reventador
Northern Andean Volcanic Arc

During 1-7 July IG reported a high level of seismic activity including explosions, tremor, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover sometimes prevented visual observations. Incandescent material that traveled more than 1 km down the SE flank was visible during 1-2 and 6 July in thermal images. Ash emissions were visible on 2 July, and a steam-and-ash plume that rose 2 km and drifted SW was visible the next day. A minor ash emission rose less than 500 m and drifted W on 6 July.

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

Santa Maria (Guatemala) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Santa Maria
Central America Volcanic Arc

INSIVUMEH reported that an explosion at 0436 on 5 July from Caliente cone, part of Santa María's Santiaguito lava-dome complex, generated an ash plume that rose 500 m and drifted SW. Explosions during 5-6 July produced ash plumes that rose 800 m and drifted W, causing ashfall in the Palajunoj area. Avalanches from lava-flow fronts descended the flanks.

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

Sheveluch (Russia) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Sheveluch
Eastern Kamchatka Volcanic Arc

KVERT reported that during 26 June-3 July lava-dome extrusion onto Sheveluch’s N flank was accompanied by fumarolic activity. Satellite images showed a thermal anomaly over the volcano during 25-28 and 30 June; weather clouds obscured the volcano on the other days. The Aviation Color Code remained at Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Shishaldin (United States) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Shishaldin
Aleutian Ridge Volcanic Arc

AVO reported that seismicity at Shishaldin continued to be elevated over background levels 1-7 July indicating that low-level eruptive activity confined to the summit crater likely continued. Although cloud cover often prevented visual observations, webcam images showed periodic steaming, and ash at the summit during 2-3 July. Elevated surface temperatures at the summit were detected in satellite images on 3 and 7 July. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Sinabung (Indonesia) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Sinabung
Sunda Volcanic Arc

Based on reports from PVMBG, the Darwin VAAC reported that on 1 July an ash plume rose 2 km above Sinabung’s summit crater and drifted E. The next day an ash plume rose 1.6 km above the crater.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)

Soputan (Indonesia) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Soputan
Sangihe Volcanic Arc

PVMBG reported that during June-3 July white plumes were observed rising as high as 750 m above Soputan even though inclement weather sometimes obscured crater views. Seismicity during the previous three months had declined (specifically shallow volcanic earthquakes, volcanic earthquakes, and signals indicating emissions and avalanches) but remained higher than levels recorded prior to the elevated activity which lead to the Alert Level increase on 26 December 2014. Low-frequency harmonic tremor was occasionally detected. The Alert Level was lowered to 2 (on a scale of 1-4). Residents and tourists were advised not to approach the craters within a radius of 4 km, or 6.5 km on the WSW flank.

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

Tungurahua (Ecuador) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Tungurahua
Northern Andean Volcanic Arc

IG reported moderate seismic activity at Tungurahua during 31 June-7 July, characterized by long-period events, minor instances of tremor, and one explosion. Cloud cover often prevented visual observations. On 31 June a vapor plume rose 500 m and drifted NW. Small amounts of ash fell in Choglontus (13 km WSW) and El Manzano (8 km SW), and roaring was reported. A steam emission rose 300 m on 3 July, and minor ashfall was again reported in Choglontus. An explosion produced a steam-and-ash plume that rose 1 km and drifted NW. A small pyroclastic flow occurred near the crater. Ashfall was reported in Choglontus. On 6 July minor ashfall was reported in El Manzano and a small explosion was recorded at 0554. A lahar descended the Achupashal drainage causing a road closure near Pájaros-Penipe.

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

Ubinas (Peru) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Ubinas
Central Andean Volcanic Arc

Instituto Geofísico del Perú (IGP) Observatorio Volcanológico del Sur (OVS) reported that during 30 June-6 July volcano-tectonic earthquakes decreased and the rate of long-period events remained steady as compared to the previous week. The number of hybrid events slightly increased. Explosions were observed, and ash emissions rose as high as 1.6 km above the crater base and drifted NE, E, and SE.

Source: Instituto Geofísico del Perú (IGP)

Zhupanovsky (Russia) | 1 July-7 July 2015 | Continuing ActivityCite this Report

Zhupanovsky
Eastern Kamchatka Volcanic Arc

KVERT reported that explosive activity at Zhupanovsky probably continued during 26-3 July; weather clouds obscured views of the volcano. The Aviation Color Code remained at Orange.

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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